The concentration of A after 20 seconds is approximately 3.63 Molar.
For a zeroth order reaction, the rate equation is given by:
rate = [tex]-k[A]^0[/tex]
Since [tex][A]^0[/tex] is equal to 1, the rate equation simplifies to:
rate = -k
This means that the rate of the reaction is constant and independent of the concentration of A.
To find the concentration of A after a certain time, we can use the integrated rate equation for zeroth order reactions:
[A]t = [A]0 - kt
where:
[A]t is the concentration of A at time t
[A]0 is the initial concentration of A
k is the rate constant
t is the time
Given:
[A]0 = 4.0 M (initial concentration)
k = 0.0185 [tex]s^{-1[/tex] (rate constant)
t = 20 seconds (time)
Substituting the given values into the equation:
[A]20 = [A]0 - kt
[A]20 = 4.0 M - (0.0185 [tex]s^{-1[/tex])(20 s)
[A]20 = 4.0 M - 0.37 M
[A]20 ≈ 3.63 M
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11. Draw line angle structures that correspond with these names. a. 2-isopropylaniline b. meta-ethylphenol c. cis-2-heptene d. 2-bromo-3-chlorocyclohexene e. 1-bromo-3-chloro-1-heptyne f. 4-butyl-2-octyne
2-isopropylaniline: CH3CH(CH3)C6H4NH2The structure has a phenyl group (C6H5) with an amino group (NH2) attached to the second carbon of an isopropyl group (CH3CH(CH3)).
meta-ethylphenol: C6H4(OH)C2H5 (C2H5) attached to the meta position (the third carbon) of the phenyl group.cis-2-heptene:
CH3CH=CHCH2CH2CH2CH3 The structure has a cis double bond (CH=CH) between the second and third carbons of a heptane chain (CH3CH2CH2CH2CH2CH3).
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a. To draw the line angle structure for 2-isopropylaniline, start with a benzene ring. Attach a methyl group (CH3) to the second carbon of the benzene ring, and an isopropyl group (CH(CH3)2) to the nitrogen atom of the benzene ring.
b. For meta-ethylphenol, begin with a benzene ring. Attach an ethyl group (CH2CH3) to the meta position, which means the carbon atom in the middle of the ring has the ethyl group attached to it. Finally, add a hydroxyl group (-OH) to the para position, which means the carbon atom opposite to the ethyl group.
c. To draw the line angle structure for cis-2-heptene, start with a chain of seven carbon atoms. Ensure that the double bond is between the second and third carbon atoms. The cis configuration means that the substituents on the same side of the double bond should be on the same side of the structure.
d. For 2-bromo-3-chlorocyclohexene, draw a cyclohexene ring with a double bond between the second and third carbon atoms. Attach a bromine atom to the second carbon and a chlorine atom to the third carbon.
e. To draw the line angle structure for 1-bromo-3-chloro-1-heptyne, start with a chain of seven carbon atoms. Attach a bromine atom to the first carbon and a chlorine atom to the third carbon. Place a triple bond between the first and second carbon atoms.
f. For 4-butyl-2-octyne, begin with a chain of eight carbon atoms. Attach a butyl group (CH2CH2CH2CH3) to the fourth carbon. Add a triple bond between the second and third carbon atoms.
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The direction of the electric field halfway between an electron and a proton is toward the electron toward the proton perpendicular to the line from the electron to the proton undefined since the electric field is zero Cannot be determined
The direction of the electric field halfway between an electron and a proton is undefined since the electric field is zero. Electric field between an electron and a proton.
In general, the direction of an electric field is from positive to negative charge. Electrons are negatively charged particles, while protons are positively charged particles.
The direction of an electric field halfway between an electron and a proton is such that it points perpendicular to the line that connects them. At that point, the two electric fields cancel each other, which leads to a zero electric field. Therefore, the direction of the electric field at that point is undefined. It is important to note that this concept applies to a specific point halfway between the electron and proton.
At other points between the two charges, the electric field will have a specific direction. The direction of the electric field can be determined using Coulomb's Law, which states that the magnitude of the electric field is directly proportional to the product of the charges and inversely proportional to the distance between the charges.
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Consider the zeroth order decomposition of A with an initial concentration of 5.5 M. If k= 0.0090 s-1, what is the concentration of A after 45 seconds?
A zeroth order decomposition of A has an initial concentration of 5.5 M. If k= 0.0090 [tex]s^{-1[/tex]. The concentration of A after 45 seconds is approximately 5.1 M.
In a zeroth order reaction, the rate of reaction is independent of the concentration of the reactant. The rate equation for a zeroth order reaction is:
Rate = k
Where k is the rate constant.
To determine the concentration of A after a certain time, we can use the integrated rate law for a zeroth order reaction:
[A]t = [A]0 - kt
Where [A]t is the concentration of A at time t, [A]0 is the initial concentration of A, k is the rate constant, and t is the time.
Given:
[A]0 = 5.5 M
k = 0.0090 [tex]s^{-1[/tex]
t = 45 seconds
Substituting the values into the equation:
[A]45 = 5.5 M - (0.0090 [tex]s^{-1[/tex])(45 s)
[A]45 = 5.5 M - 0.405 M
[A]45 = 5.095 M
Therefore, the concentration of A after 45 seconds is approximately 5.1 M (rounded to one decimal place).
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Describe the following chemical reactions. Include any enzyme catalysts discussed in class last week: A. Oxidation-reduction (ReDox reactions) B. Phosphorylation C. Hydrolysis D. Decomposition
Answer:
Chemical reactions are fundamentally characterized by the rearrangement of atoms in one or more substances to create one or more new substances that differ in properties and arrangement from the original substances. Different types of chemical reactions exist, including oxidation-reduction reactions (ReDox), phosphorylation, hydrolysis, and decomposition reactions.
A. Oxidation-reduction (ReDox reactions)
In ReDox reactions, electrons are transferred from one molecule to another. In an oxidation reaction, a substance loses electrons while in a reduction reaction, it gains electrons. Enzyme catalysts that facilitate redox reactions include hydrogenase and cytochrome c oxidase.
B. Phosphorylation
Phosphorylation reactions include the addition of a phosphate group (PO4) to an organic molecule. This type of reaction is often seen in the process of transferring energy within the cell and involves the enzyme, kinases.
C. Hydrolysis
Hydrolysis is a reaction in which water breaks down a compound into two parts. Enzymes that facilitate hydrolysis reactions are called hydrolases, such as amylase which breaks down carbohydrates, and lipases which break down fats.
D. Decomposition
A decomposition reaction refers to the breakdown of a compound into two or more substances. This reaction can be spontaneous or occur due to external factors such as heating. An enzyme catalyst that is involved in decomposition reactions is peptidase, which breaks down proteins.
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how cold does it have to be for boiling water to freeze in midair
When boiling water is thrown in the air during frigid weather, it will instantly turn into ice crystals before hitting the ground.
This is a thrilling sight, but do you know how cold it must be outside to freeze boiling water midair?
To begin, the air temperature must be below freezing. However, this is not enough to produce the phenomenon. You’ll also need to understand the relationship between water temperature and pressure. Water, on the other hand, will only freeze when it is under great pressure. As a result, the temperature at which boiling water can freeze mid-air is determined by atmospheric pressure. This implies that the boiling water should be exposed to colder temperatures than -30 degrees Fahrenheit. This occurs when there is less air pressure at higher elevations. As a result, when throwing boiling water in the air from a tall building, you might have a better chance of seeing it freeze.
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calculate the amount of dextrose in 0.0005kl D5W
There are 0.025 grams of dextrose in 0.0005 kiloliters (or 0.5 liters) of D5W.
Let's recalculate the amount of dextrose in 0.0005 kiloliters of D5W accurately:
To calculate the amount of dextrose in D5W, we multiply the volume of D5W by the percentage strength of dextrose in D5W.
Given:
Volume of D5W = 0.0005 kiloliters
Percentage strength of dextrose in D5W = 5% = 0.05
First, let's convert the volume of D5W from kiloliters to liters:
0.0005 kiloliters = 0.0005 × 1000 = 0.5 liters
Now, we can calculate the amount of dextrose:
Amount of dextrose = Volume of D5W × Percentage strength of dextrose in D5W
Number of dextrose = 0.5 liters × 0.05
Amount of dextrose = 0.025 grams
Therefore, there are 0.025 grams of dextrose in 0.0005 kiloliters (or 0.5 liters) of D5W.
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A 1.55 g sample of CO
2
is contained in a 547 mL flask at 26.0
∘
C. What is the pressure of the gas? Pressure = atm
A 1.55 g sample of CO2 is contained in a 547 mL flask at 26.0°C. We need to calculate the pressure of the gas at this temperature.
The gas pressure formula is given as: P = nRT/V Where, P = Pressure n = Number of moles of gas R = Ideal gas constant T = Temperature V = Volume of gas. To solve the given problem, we will use the following steps:
Step 1: Calculate the number of moles of CO2.
Step 2: Calculate the gas constant R.
Step 3: Convert the temperature from °C to K
Step 4: Calculate the pressure using the ideal gas law equation.
Step 1: Calculate the number of moles of CO₂. The formula to calculate the number of moles of gas is: n = mass of gas / molar mass of gas. The molar mass of CO2 = 12.01 + 2(16.00) = 44.01 g/mol n = 1.55 g / 44.01 g/mol = 0.03525 mol
Step 2: Calculate the gas constant R. The value of the gas constant R is 0.0821 L·atm/mol·K.
Step 3: Convert the temperature from °C to K.T he temperature given in the problem is 26.0 °C. To convert Celsius to Kelvin, we use the formula :K = °C + 273.15K = 26.0 + 273.15 = 299.15 K
Step 4: Calculate the pressure using the ideal gas law equation. P = nRT/VP = (0.03525 mol) × (0.0821 L·atm/mol·K) × (299.15 K) / (0.547 L)P = 2.20 atm.
Therefore, Pressure of the gas = 2.20 atm
We calculated the pressure of the gas by using the ideal gas law equation. To apply this equation, we first calculated the number of moles of CO2 in the flask by dividing the mass of the gas by its molar mass. We then used the ideal gas constant and converted the given temperature from Celsius to Kelvin. Finally, we plugged in all the values into the ideal gas law equation and solved for pressure. The pressure of the gas is 2.20 atm.
Therefore, we can conclude that the pressure of the gas is 2.20 atm.
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A UF lab student starts with 100.0 mL of an unknown stock solution, then performs a series of serial dilutions to obtain a usable concentration of 0.0500M concentration of NaCl. The student began with a 100.0 mL stock solution, removed 5.00 mL of the stock solution and placed it in a 500.0 mL volumetric flask and filled it to 500.0 mL with water. Then, the student removed 20.0 mL of the new solution and placed it in a 100.0 mL volumetric flask and filled it to 100.0 mL with water. What mass of NaCl was added to the original stock solution?
Mass of NaCl was added to the original stock solution 0.0263 g of NaCl was added to the original stock solution.
According to the given information:Total Moles of NaCl in the final dilution = Molarity * Volume (in L) * 1000. Hence, 0.0263 g of NaCl was added to the original stock solution.
= 0.0500 M * 100.0 mL * 10-3 * 1000
= 5.00 mmol
Number of moles of NaCl = C1 * V1 (in L) * 1000 (to convert from ml to L)
= 1.00 x 10-4 M * 20.0 ml * 10-3 * 1000
= 2.00 x 106 mol
Number of moles of NaCl in the stock solution = number of moles of NaCl in final dilution * V2 (in L) * 1000 (to convert from ml to L)
= 2.00 x 10-6 mol * 100.0 mL * 10-3 * 1000
= 2.00 x 104 mol
Total number of moles of NaCl added to the original stock solution
= number of moles of NaCl in 1st dilution + number of moles of NaCl in 2nd dilution
= 2.50 x 104 mol + 2.00 x 104 mol
= 4.50 x 104 mol
Mass of NaCl added to the original stock solution
= number of moles of NaCl added * molar mass of NaCl
= 4.50 x 104 mol * 58.44 g/mol = 2.63 x 102 g
Hence, 0.0263 g of NaCl was added to the original stock solution.
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Starting with a 70 w/w% of concentrated nitric acid, describe how you will make 500 mL of a 0.2% w/v HNO3 solution from concentrated acid
To make 500 mL of a 0.2% w/v HNO3 solution from a 70 w/w% concentrated nitric acid, the following steps can be followed :Firstly, determine the amount of nitric acid required to make a 0.2% w/v HNO3 solution of 500 mL.
According to the given information:Volume of concentrated HNO3= Percentage strength of HNO3 x Volume of diluted HNO3 / Percentage strength of diluted HNO3 Volume of concentrated HNO3
= 70 x V1 / 0.2V1
= 500 x 0.2 / 70V1
= 1.4286 mL
Therefore, 1.4286 mL of concentrated nitric acid is needed to make 500 mL of a 0.2% w/v HNO3 solution. Next, measure out 1.4286 mL of the concentrated nitric acid using a pipette and transfer it to a volumetric flask.
Then, add water to the flask and bring the total volume to 500 mL using a measuring cylinder.
Finally, mix the solution thoroughly to ensure that the content loaded in the volumetric flask is well mixed and the desired concentration of 0.2% w/v HNO3 is achieved.
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Which of the following products is a primary alkyl halide? Select one: a. (CH
3
)
3
CCH(CH
3
)Br b. (CH
3
)
3
CBr C. (CH
3
)
3
CCH
2
Br d. (CH
3
)
2
CHBr
(CH₃)₃CCH₂Br is a primary alkyl halide. Alkyl halides or haloalkanes are organic compounds that have a halogen atom (F, Cl, Br, or I) attached to one of the sp3 hybridized carbons of an alkyl group. The correct option is c.
They are subdivided into primary (1°), secondary (2°), and tertiary (3°) according to the carbon to which the halogen is bound.
Halides of primary and secondary alkyl groups are significant, with tertiary halides being less important.
(CH₃)₃CCH₂Br is a primary alkyl halide since the halogen atom is bound to the end carbon of the carbon chain, which is only connected to a single carbon atom.
Because primary alkyl halides have a carbon atom connected to only one other carbon and a halogen atom, they are the most reactive and readily undergo substitution reactions.
Thus, (CH₃)₃CCH₂Br is a primary alkyl halide. The correct option is c.
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Please complete the following problems. Make sure to show all your work: 1. Find the number of atoms in 7.85 g of aluminum. (2 point) 2. Suppose, for example, 8.75 g of propane (C
3
H
8
) react with oxygen gas (O
2
) to produce carbon dioxide (CO
2
) and water (H
2
O). How many grams of water are produced? (3 points) 3. For example what is the limiting reagent when 385 g of sodium ( Na ) reacts with 125 g of chlorine gas (Cl
2
) ?
1. The number of atoms in 7.85 g of aluminum can be calculated using the concept of molar mass and Avogadro's number.
First, we need to determine the molar mass of aluminum (Al). The atomic mass of aluminum is approximately 26.98 g/mol.
Next, we can use the molar mass to calculate the number of moles of aluminum in 7.85 g. This can be done by dividing the mass (in grams) by the molar mass (in grams per mole):
Number of moles = Mass / Molar mass
Number of moles = 7.85 g / 26.98 g/mol ≈ 0.291 moles
Since 1 mole of any substance contains Avogadro's number of particles (6.022 × 10^23), we can multiply the number of moles by Avogadro's number to find the number of atoms:
Number of atoms = Number of moles × Avogadro's number
Number of atoms = 0.291 moles × 6.022 × 10^23 atoms/mol ≈ 1.75 × 10^23 atoms
Therefore, there are approximately 1.75 × 10^23 atoms in 7.85 g of aluminum.
2. To determine the grams of water produced when 8.75 g of propane (C3H8) reacts with oxygen gas (O2), we first need to balance the chemical equation for the reaction:
C3H8 + 5O2 → 3CO2 + 4H2O
From the balanced equation, we can see that 1 mole of propane (C3H8) reacts to produce 4 moles of water (H2O).
First, calculate the number of moles of propane using its molar mass. The molar mass of propane is approximately 44.1 g/mol.
Number of moles of propane = Mass of propane / Molar mass of propane
Number of moles of propane = 8.75 g / 44.1 g/mol ≈ 0.198 moles
Since the molar ratio between propane and water is 1:4, the number of moles of water produced is:
Number of moles of water = 4 moles of water/mol of propane × Number of moles of propane
Number of moles of water = 4 × 0.198 moles ≈ 0.792 moles
Finally, we can calculate the mass of water produced using the molar mass of water (approximately 18.0 g/mol):
Mass of water = Number of moles of water × Molar mass of water
Mass of water = 0.792 moles × 18.0 g/mol ≈ 14.26 g
Therefore, approximately 14.26 grams of water are produced when 8.75 g of propane reacts with oxygen gas.
3. To determine the limiting reagent when 385 g of sodium (Na) reacts with 125 g of chlorine gas (Cl2), we need to compare the amounts of reactants and their stoichiometric ratios.
First, we can calculate the number of moles for each reactant using their molar masses. The molar mass of sodium is approximately 22.99 g/mol, and the molar mass of chlorine gas is approximately 70.91 g/mol.
Number of moles of sodium = Mass of sodium / Molar mass of sodium
Number of moles of sodium = 385 g / 22.99 g/mol ≈ 16.75 moles
Number of moles of chlorine gas = Mass of chlorine gas / Molar mass of chlorine gas
Number of moles of chlorine gas = 125 g / 70.91 g/mol ≈ 1.76 moles
Next, we compare the mole ratios of the reactants based on the balanced chemical equation:
2Na + Cl2 → 2NaCl
From the equation, we can see that the stoichiometric ratio between sodium and chlorine is 2:1. This means that for every 2 moles of sodium, we need 1 mole of chlorine gas.
Since we have 16.75 moles of sodium and 1.76 moles of chlorine gas, we can calculate the available moles of chlorine gas relative to the sodium:
Available moles of chlorine gas = Number of moles of chlorine gas / Stoichiometric ratio
Available moles of chlorine gas = 1.76 moles / (2 moles Na / 1 mole Cl2) ≈ 0.88 moles
Since we have less moles of chlorine gas than required by the stoichiometry, chlorine gas is the limiting reagent. It will be completely consumed in the reaction, and the sodium will be left in excess.
In summary, when 385 g of sodium reacts with 125 g of chlorine gas, chlorine gas is the limiting reagent.
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In the combustion of hydrogen gas, hydrogen reacts with oxygen from the air to form water vapor. hydrogen + oxygen ⟶ water If you burn 24.4 g of hydrogen and produce 218 g of water, how much oxygen reacted?
The amount of oxygen reacted is 109.6 g.
To determine the amount of oxygen reacted, we need to consider the law of conservation of mass. According to this law, the total mass of the reactants must equal the total mass of the products in a chemical reaction.
The balanced equation for the combustion of hydrogen gas is:
2H₂ + O₂ ⟶ 2H₂O From the equation, we can see that for every 2 moles of hydrogen gas (H₂) consumed, we need 1 mole of oxygen (O₂) to produce 2 moles of water (H₂O). The molar mass of hydrogen is approximately 1 g/mol, and the molar mass of water is approximately 18 g/mol.
First, we calculate the number of moles of hydrogen used: moles of hydrogen = mass of hydrogen / molar mass of hydrogen
= 24.4 g / 2 g/mol
= 12.2 mol
Since 2 moles of hydrogen react with 1 mole of oxygen, the number of moles of oxygen required is half the number of moles of hydrogen:
moles of oxygen = 1/2 * moles of hydrogen
= 1/2 * 12.2 mol
= 6.1 mol
Finally, we calculate the mass of oxygen reacted: mass of oxygen = moles of oxygen * molar mass of oxygen
= 6.1 mol * 32 g/mol
= 195.2 g
Therefore, the amount of oxygen reacted is 195.2 g.
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how many milliliters of water do you need to prepare the desired solution?
The volume (in milliliters) of water needed to prepared the desired solution is 3720 mL
How do i determine the volume of water needed?From the question given, the following data were obtained:
Molarity of solution = 0.25 MMole of solute = 0.93 molesVolume of water =?The volume of water needed can be obtained as follow:
Volume of water = mole of solute / molarity of solution
= 0.93 / 0.25
= 3.72 L
Multiply by 1000 to express in mL
= 3.72 × 1000
= 3720 mL
Thus, the volume of the water needed is 3720 mL
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Complete question:
A solution has a molarity of 0.25 M. This solution contains 0.93 moles of solute. How many milliliters of water do you need to prepare the desired solution?
Complete the following reaction by drawing a structural formula for the product. - You do not have to consider stereochemistry. - You do not have to explicitly draw H atoms. Draw a structural formula for the major organic anion formed when propanone is reacted with Tollens' reagent. - You do not have to consider stereochemistry. - You do not have to explicitly draw H atoms. - If no reaction occurs, draw the organic starting material
When propanone is reacted with Tollens' reagent, no reaction occurs, and the major organic starting material, propanone (CH₃COCH₃), is the product of the reaction.
Tollens' reagent, also known as silver mirror test, is used to distinguish aldehydes from ketones. When propanone (also known as acetone), a ketone, is reacted with Tollens' reagent, it does not undergo a reaction. Therefore, the major organic starting material, propanone, would be the product of the reaction.
Propanone has the structural formula CH₃COCH₃. It is a colorless, volatile liquid that belongs to the ketone functional group. It is widely used as a solvent, as well as in the production of various chemicals.
Tollens' reagent consists of silver nitrate (AgNO₃) dissolved in aqueous ammonia (NH₃). When an aldehyde reacts with Tollens' reagent, it undergoes oxidation, resulting in the formation of a carboxylic acid and a silver mirror. However, ketones do not undergo this reaction.
Therefore, in the reaction between propanone and Tollens' reagent, no reaction occurs, and the major organic starting material, propanone, remains unchanged.
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3. A home in Corvallis, Oregon has a rooftop area of 1800 square feet. The owners would like to install a rain catchment system to store rain water for their summer garden. The storage tank for the system they are considering holds 1,000 gallons. If the total annual rainfall averages 51 inches, what percentage of the rain that hits the roof will need to be diverted into the catchment system?
Approximately 2.51% of the rain that hits the roof will need to be diverted into the catchment system.
The total amount of rainfall that hits the roof of the house in a year can be determined by multiplying the roof area by the average rainfall.
In this case, the total amount of rainfall that hits the roof of the house in a year can be calculated as follows:
1800 sq ft x 51 in/yr = 91800 cubic inches/yr
The amount of rainfall that needs to be diverted into the catchment system is equal to the amount of water that can be stored in the tank, which is 1000 gallons.
To convert the amount of water that can be stored in the tank to cubic inches, multiply the number of gallons by 231 (since 1 gallon = 231 cubic inches).
1000 gallons x 231 cubic inches/gallon = 231000 cubic inches
The percentage of rainfall that needs to be diverted into the catchment system can be calculated by dividing the volume of water that can be stored in the tank by the total amount of rainfall that hits the roof of the house in a year and then multiplying by 100.
The calculation is shown below:
231000 cubic inches / 91800 cubic inches/yr x 100 = 251.08% (rounded to two decimal places)
Therefore, approximately 2.51% of the rain that hits the roof will need to be diverted into the catchment system.
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The rate constant of a certain reaction is known to obey the Arrhenius equation, and to have an activation energy E
α
=72.0 kJ/mol. If the rate constant of this reaction is 0.62M
−1
' s
−1
at 185.0
∘
C, what will the rate constant be at 274.00
∘
C ? Round your answer to 2 significant digits.
To determine the rate constant at a different temperature using the Arrhenius equation, we can utilize the formula: k2 = k1 * exp((Ea / R) * ((1 / T1) - (1 / T2))), where k1 is the initial rate constant, Ea is the activation energy, R is the gas constant (8.314 J/(mol·K)), T1 is the initial temperature, and T2 is the final temperature.
Given that the activation energy Ea is 72.0 kJ/mol, the initial rate constant k1 is 0.62 M^(-1)·s^(-1), T1 is 185.0 °C, and T2 is 274.00 °C, we can proceed with the calculations.
First, we need to convert the temperatures to Kelvin:
T1 = 185.0 + 273.15 = 458.15 K
T2 = 274.00 + 273.15 = 547.15 K
Substituting the values into the Arrhenius equation, we have:
k2 = 0.62 * exp((72.0 / (8.314)) * ((1 / 458.15) - (1 / 547.15)))
Calculating this expression will give us the rate constant at the final temperature, and rounding the answer to two significant digits will provide the final result.
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A mixture of 0.543 M H2,0.543 M H2, 0.306 M I2,0.306 M I2, and 0.866 M HI0.866 M HI is enclosed in a vessel and heated to 430 °C.
H2(g)+I2(g)↽−−⇀2HI(g)Kc=54.3 at 430 ∘CH2(g)+I2(g)↽−−⇀2HI(g)Kc=54.3 at 430 ∘C
Calculate the equilibrium concentrations of each gas at 430 ∘C430 ∘C .
The equilibrium concentrations of each gas at 430 °C can be calculated using the provided equilibrium constant (Kc) and the initial concentrations of the reactants.
Given the equilibrium equation H2(g) + I2(g) ⇌ 2HI(g) and the equilibrium constant Kc = 54.3 at 430 °C, we can set up an ICE (Initial-Change-Equilibrium) table to calculate the equilibrium concentrations. Let's denote the initial concentrations of H2, I2, and HI as [H2]₀, [I2]₀, and [HI]₀, respectively. Based on the given information, we have [H2]₀ = 0.543 M, [I2]₀ = 0.306 M, and [HI]₀ = 0.866 M.In the ICE table, we start with the initial concentrations and then determine the changes in concentration (x) based on the stoichiometry of the reaction. Since the stoichiometric coefficients are 1:1:2 for H2, I2, and HI, the change in concentration for H2 and I2 is -x, while the change for HI is +2x.At equilibrium, we add the initial concentration and the change in concentration to obtain the equilibrium concentrations. Therefore, the equilibrium concentrations are [H2] = [H2]₀ - x, [I2] = [I2]₀ - x, and [HI] = [HI]₀ + 2x.To solve for x, we can set up an expression using the equilibrium constant Kc and substitute the equilibrium concentrations into it. In this case, Kc = ([HI]²) / ([H2] * [I2]) = 54.3.Once we solve for x, we can substitute the value back into the expressions for the equilibrium concentrations to obtain the final values at 430 °C.
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Determine the relationship between the radii of magnesium and tellurium in beta-MgTe and the lattice parameter, a, for beta-magnesium telluride (MgTe). (5 pts.) 브) Would the (113) plane in MgTe be observed by x-ray diffraction? To get three of the five points, explain why. You may wish to do parts K \& L first. (8 pts.) I) Determine the number of magnesium atoms (or ions) and the number of tellurium atoms (or ions) in the unit cell. (6 pts.) J) Calculate the bulk density of β-MgTe in grams per cubic centimeter. The atomic masses of Mg and Te are 24.305g/mole of atoms and 127.6g/mole of atoms, respectively. Avogadro's # =6.022×10 ^23
atoms /mole of atoms. 1) In β-MgTe, tellurium is a metalloid that acts as a nonmetal in this case. (5 pts.) A) Based on the accompanying electronegativity data, calculate the percent ionic character in beta-magnesium telluride, and determine whether the bonding in beta-magnesium telluride is ionic, covalent, metallic, hydrogen, or van der Waals. (4 pts.) B) Based on your answer to part A), find the appropriate radii and charges. A sufficient partial table of radii and charges is part of the test packet. Radius for tellurium in magnesium telluride = Tellurium charge = Radius for magnesium in magnesium telluride = Magnesium charge = (2 pts.) C) What is the electron configuration of Mg in MgTe? (2 pts.) D) What is the electron configuration of Te in β-MgTe (magnesium telluride)? (4 pts.) E) Based on your answer to part B) and the accompanying flowchart, determine the coordination number for both Mg and Te in magnesium telluride. (8 pts.) F) Based on your answer to part E), sketch the crystal structure for beta-MgTe Remember, the definition of a lattice parameter is how far you have to go along a direction that the atoms or ions touch until you reach an equivalent atom or ion. Do not switch between crystal systems for the rest of the problem. You will be graded partly on how consistent you are. You can refer to figures in the text if the unit cell is too difficult to draw.
The relationship between the radii of magnesium and tellurium in beta-MgTe and the lattice parameter, a, can be determined using the ionic radii. The lattice parameter, a, is equal to the sum of the ionic radii of magnesium and tellurium.
The relationship between the radii of Mg and Te and the lattice parameter can be determined using the following equation:
a = 2 * (r(Mg) + r(Te))
where r(Mg) is the radius of magnesium and r(Te) is the radius of tellurium.
To determine if the (113) plane in MgTe would be observed by x-ray diffraction, we need to check if the Miller indices (hkl) of the plane satisfy the Laue condition. If the Miller indices (hkl) of the plane can be expressed as (2n+1)l (where n and l are integers), then the (113) plane would be observed by x-ray diffraction.
Here, The (113) plane in MgTe would not be observed by X-ray diffraction due to its densely packed but non-close-packed nature.
To calculate the number of magnesium atoms (or ions) and tellurium atoms (or ions) in the unit cell, we need to determine the formula unit of beta-MgTe. Since MgTe is an ionic compound, the formula unit would consist of one magnesium ion (Mg2+) and one tellurium ion (Te2-).
To calculate the bulk density of β-MgTe in grams per cubic centimeter, we need to use the formula:
Bulk Density = (mass of unit cell)/(volume of unit cell)
To calculate the mass of the unit cell, we need to know the molar mass of β-MgTe. The molar mass of β-MgTe can be calculated by adding the molar masses of magnesium and tellurium:
Molar mass of β-MgTe = (number of magnesium atoms in the unit cell) * (molar mass of magnesium) + (number of tellurium atoms in the unit cell) * (molar mass of tellurium)
To calculate the volume of the unit cell, we need to know the lattice parameter, a, which is the distance between the touching magnesium and tellurium ions.
To calculate the percent ionic character in beta-magnesium telluride (MgTe), we can use the equation:
Percent ionic character = (1 - e^2/(4πεr))/100
where e is the charge of the electron, ε is the permittivity of free space, and r is the distance between the magnesium and tellurium ions.
The electron configuration of Mg in MgTe is 1s^2 2s^2 2p^6 3s^2.
The electron configuration of Te in β-MgTe (magnesium telluride) is [Kr] 4d^10 5s^2 5p^4.
The coordination number for both Mg and Te in magnesium telluride can be determined based on their ionic radii. The coordination number is the number of ions that surround a central ion in a crystal lattice.
The crystal structure for beta-MgTe can be sketched based on the coordination numbers of Mg and Te. The coordination numbers will determine the arrangement of the ions in the crystal lattice.
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Which of the following compounds does not contain a polyatomic ion?
1.) CO2
2.) MgCO3
3.) SiO2
4.) CO
1.) The compound that does not contain a polyatomic ion is carbon dioxide [tex]CO_2}[/tex].
[tex]CO_2[/tex], also known as carbon dioxide, is a molecule composed of two atoms of oxygen (O) and one atom of carbon (C). It does not contain a polyatomic ion because it is a covalent compound formed by the sharing of electrons between the carbon and oxygen atoms. The carbon and oxygen atoms have stable electron configurations by sharing electrons, rather than gaining or losing electrons to form ions. Therefore, [tex]CO_2[/tex] does not involve the presence of a polyatomic ion.
Carbon dioxide (CO2) is a crucial compound in the Earth's atmosphere and plays a significant role in various natural processes. It is a byproduct of cellular respiration in living organisms and is released into the atmosphere during the combustion of fossil fuels. Additionally, carbon dioxide is a greenhouse gas that contributes to the greenhouse effect and climate change. Understanding the properties and behavior of CO2 is essential for studying topics such as atmospheric science, climate modeling, and environmental impact assessments.
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Describe the 3 main patterns of chemical reactions (synthesis, decomposition, exchange) Describe redox reactions (LEO says GER) Define endergonic and exergonic and know the differences between each (catabolic, anabolic) Explain why reactions in biological systems are rarely reversible (disappearing products) List the factors which can affect reaction rates, and what happens with each (i.e. how do we speed up reactions) Describe difference between inorganic and organic compounds
Chemical reactions can be classified into three patterns, including synthesis, decomposition, and exchange.Synthesis is a reaction where two or more reactants combine to form a single product. A common example of synthesis is the formation of a compound, for example, water.
The reaction of hydrogen gas and oxygen gas forms water.2H2 + O2 ⟶ 2H2ODecomposition is the opposite of synthesis, where a compound breaks down into two or more products. For example, the decomposition of water can be represented as:2H2O ⟶ 2H2 + O2Exchange reactions involve both synthesis and decomposition. In these reactions, the reactants exchange atoms, and the products are different compounds. For example, the reaction between hydrogen chloride and sodium hydroxide produces salt and water.HCl + NaOH ⟶ NaCl + H2OThe redox reaction is a type of exchange reaction in which oxidation and reduction take place. The reducing agent is oxidized, and the oxidizing agent is reduced.
The acronym LEO (Loss of Electrons is Oxidation) and GER (Gain of Electrons is Reduction) are used to remember the rules. For example, consider the reaction of hydrogen gas and oxygen gas to produce water.2H2 + O2 ⟶ 2H2OIn this reaction, hydrogen is oxidized, and oxygen is reduced. The hydrogen molecule (H2) is the reducing agent, and oxygen is the oxidizing agent. In organic chemistry, reduction is a reaction that involves the gain of electrons, and oxidation involves the loss of electrons.The endergonic and exergonic are two types of energy-releasing reactions. Endergonic reactions are reactions that absorb energy from the environment to complete the reaction. In contrast, exergonic reactions release energy into the environment as the reaction proceeds.
Anabolic reactions require energy to build large molecules, whereas catabolic reactions release energy by breaking down large molecules into smaller ones.Biological systems contain enzymes that catalyze the reactions. The products of a reaction are continually removed or consumed by the cell, making the reaction irreversible. Reactions are irreversible because the products get removed from the reaction. Factors such as temperature, surface area, concentration, catalysts, and pressure can affect the rate of a reaction. The temperature increase accelerates the reaction. Surface area increase increases the reaction rate.
High concentration increases the reaction rate. Catalysts increase the reaction rate by decreasing the activation energy of the reaction. Pressure affects the reaction rate only in gaseous reactions.Inorganic compounds are derived from non-living matter such as minerals, while organic compounds are derived from living matter. Inorganic compounds are typically smaller and simpler in structure, while organic compounds are more extensive and contain carbon-hydrogen bonds. Examples of inorganic compounds include water, metals, salts, and gases. Examples of organic compounds include carbohydrates, proteins, lipids, and nucleic acids.
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A scientist investigation the zero order reaction A > B starts a reaction at [A] = 0.911M. She finds that one minute later, the concentration of A has dropped to 0.320M. What is the rate constant? Choose the closest.
A) 2M per minute
B) 0.4M per minute
C) 0.6M per minute
D) 1.2M per minute
E) 1.8M per minute
In a zero-order reaction, the rate of the reaction is independent of the concentration of the reactant. Therefore, the rate constant is equal to -0.591 M per minute.
The negative sign indicates that the concentration of A is decreasing with time. However, we are interested in the magnitude of the rate, so we take the absolute value,The rate constant (k) for a zero-order reaction is equal to the magnitude of the rate. Therefore, the rate constant in this case is approximately 0.591 M/minute.However, none of the options provided matches this value. It's possible that there may be an error or omission in the options. Please double-check the options provided or provide additional information if available.
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The rate constant for the zero-order reaction A > B, based on the given data, is approximately [tex]\textbf{0.6M per minute}[/tex].
In a zero-order reaction, the rate of the reaction is independent of the concentration of the reactant. The rate equation for a zero-order reaction is given by the equation:
[tex]\[\text{{Rate}} = k\][/tex]
where [tex]\(\text{{Rate}}\)[/tex] is the rate of the reaction and k is the rate constant.
To determine the rate constant, we can use the given information about the change in concentration over time. The change in concentration of A can be calculated by subtracting the initial concentration from the final concentration:
[tex]\[\Delta[A] = [A]_{\text{{final}}} - [A]_{\text{{initial}}} = 0.320 \, \text{{M}} - 0.911 \, \text{{M}} = -0.591 \, \text{{M}}\][/tex]
Since this is a zero-order reaction, the change in concentration of A is equal to the rate of the reaction:
[tex]\[\text{{Rate}} = -\Delta[A] = 0.591 \, \text{{M per minute}}\][/tex]
Comparing this rate to the rate equation, we can conclude that the rate constant k is approximately 0.6M per minute. Therefore, the correct answer is [tex]\textbf{(C) 0.6M per minute}[/tex].
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molarity of the copper solution in the cuvet below was determined by spectrophotometric analysis to be 2.90 times 10^-2 M Cu. Using the diagram below to help visualize the dilution process, calculate the grams of copper in the Jefferson nickel to make the initial solution. Mass of copper in the Jefferson nickel = grams
The mass of copper in the Jefferson nickel to make the initial solution is 18.44 grams (ANS).
Given the molarity of the copper solution in the cuvet below as 2.90 x 10⁻² M Cu.
The mass of copper in the Jefferson nickel = grams
The diagram is shown below:
[tex]Cu\frac{grams}{mole}\times\frac{mol}{L}\times\frac{L}{1000mL}\times\frac{1000mL}{10mL}[/tex]
= [tex]\frac{grams}{10mL}[/tex]
Molarity is defined as the number of moles of solute dissolved in one litre of the solution.
Let us assume that the number of moles of copper present in the solution is n moles.
From the above definition of molarity, the concentration of copper in the solution can be represented as:
$$Molarity = \frac{n}{V}$$where V represents the volume of the solution in litres.
Rearranging the above equation, we have:$
n = Molarity × V$
Mass of copper in the solution can be calculated as:
$mass = n × Molar\ mass$
Substituting the given values, we get:
$$mass = Molarity × V × Molar\ mass$$$$
mass = 2.90 × 10^{−2} mol/L × 10 mL × (63.546 g/mol)$$$$
mass = 18.44 g$$
Therefore, the mass of copper in the Jefferson nickel to make the initial solution is 18.44 grams .
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Which of the following fit the definition of both a molecule and a compound? 1. He 2. H2 3. CO a) 1 only b) 2 only c) 3 only d) Both 2 and 3 Which of the following element or elements would be classified as a nonmetal? 1. Copper 2. Hydrogen 3. Potassium 4. Sodium a) 1 only b) 2 only c) 3 only c) 3 only d) 4 only e) 1,2 and 3 f) 2,3 and 4 g) All are nonmetals h) None are nonmetals
Of the following options, 3. CO (Option C. 3 only) fits the definition of both a molecule and a compound.
The element that can be classified as a nonmetal is 2. Hydrogen (Option B. 2 only).
The molecule is defined as two or more atoms that are bonded together chemically. A compound is defined as a molecule consisting of two or more different atoms combined. Both molecule and compound have the same definition, which is a combination of atoms or molecules. So, the option that fits the definition of both a molecule and a compound is option 3. CO. 3 only (Option c) fits the definition of both a molecule and a compound.
The elements that are poor conductors of heat and electricity, brittle, and do not possess metallic luster are called nonmetals. Among the given elements copper (Cu) is a metal, hydrogen (H) is a nonmetal, potassium (K) is a metal, and sodium (Na) is also a metal. So, the only element that would be classified as a nonmetal is option 2. Hydrogen. 2 only (Option b) would be classified as a nonmetal.
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which formula will give you the area of a parallelogram
The formula for finding the area of a parallelogram is given by the product of the base and the height.
For any parallelogram, the base and the height should be perpendicular to each other. In order to determine the area of a parallelogram, the base and height need to be measured first. The base is the distance between two opposite sides of the parallelogram. On the other hand, the height of a parallelogram is the perpendicular distance from the base to the opposite side. Once these measurements have been taken, the area of the parallelogram can be determined using the formula:
Area of parallelogram = base x height.
This formula holds true for all types of parallelograms, regardless of the size of the shape. Therefore, it can be used to calculate the area of any parallelogram by simply substituting the appropriate values for the base and height.
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An atom is: a positively charged particle within a nucleus. the smallest particle of an element that still retains the chemical characteristics of that element. a combination of elements. a negatively charged particle that orbits the nucleus.
An atom is the smallest particle of an element that still retains the chemical characteristics of that element.
an atom is the basic building block of matter. It is made up of protons and neutrons in the nucleus, surrounded by electrons in energy levels. The specific combination of these subatomic particles determines the properties and characteristics of each element.
It consists of three main subatomic particles: protons, neutrons, and electrons.
1. Protons are positively charged particles found in the nucleus of an atom. They contribute to the overall mass of the atom and determine the element's atomic number. Each element has a specific number of protons, which differentiates one element from another.
2. Neutrons are neutral particles found in the nucleus of an atom. They also contribute to the overall mass of the atom but do not have a charge. The number of neutrons can vary within the same element, resulting in isotopes with different masses.
3. Electrons are negatively charged particles that orbit the nucleus in specific energy levels or shells. They are much smaller and lighter than protons and neutrons. The number of electrons is equal to the number of protons in a neutral atom, balancing out the positive charge of the protons.
The combination of these subatomic particles determines the overall properties of an atom. For example, the number of protons determines the element's identity, while the arrangement of electrons in the energy levels determines its chemical behavior.
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Hydrogen cyanide gas is commercially prepared by the reaction of methane , ammonia , and oxygen at a high temperature. The other product is gaseous water.
Hydrogen cyanide gas is commercially prepared by the reaction of methane, ammonia, and oxygen at high temperature. The other product is gaseous water.
Hydrogen cyanide is a poisonous, flammable, colorless gas that has a faint odor of bitter almonds. The gas has a boiling point of 26 °C (78.8 °F) and a melting point of -14 °C (6.8 °F).Hydrogen cyanide is produced through the reaction of methane, ammonia, and oxygen at high temperatures. It is manufactured commercially by the Andrussow oxidation process, which is a reaction between ammonia, methane, and oxygen.
This reaction is exothermic, and the temperature needs to be carefully controlled to prevent an explosion of hydrogen gas. The other product produced during the reaction is gaseous water, which is also released during the process.
The hydrogen cyanide is then separated from the water by distillation. The Andrussow oxidation process is widely used in the industry to produce hydrogen cyanide gas, which is used to produce a wide range of chemicals, including plastics, resins, and synthetic fibers. The gas is also used to produce fumigants, such as Zyklon B, which was used in gas chambers during the Holocaust.
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why do we see color when atoms of an element are energized
When atoms of an element are energized, we see color because the electrons absorb the energy and jump to a higher energy level. When the electrons go back to their original energy level, they release the energy in the form of light.
The frequency and wavelength of the light depend on the amount of energy that was absorbed and released. Different amounts of energy result in different colors. The absorption of energy results in the promotion of an electron to a higher energy level. This electron is not stable at the higher level and quickly falls back to the original energy level.
As the electron drops, it releases energy in the form of a photon, which is a tiny packet of light. The energy of the photon is equal to the difference in energy between the two energy levels. Different energy levels produce different colors of light, which is why different elements emit different colors.
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Laboratory Safety and Procedures Post-Lab Questions: 1. Most of the chemicals included in your Introductory Chemistry Lab kit can be discarded down a drain with copious amounts of water. Describe a situation in which you would need to neutralize a chemical (pH7) before discarding down a drain. 2. Why should one add acid to water rather than add water to acid when preparing solutions? 3. At what point was the solution in beaker C neutralized? 4. Address the following scenarios: - If a stronger solution of sodium bicarbonate was used in beaker C, would it require more or less hydrochloric acid to neutralize? Why? - If a weaker solution of sodium bicarbonate was used in beaker C, would that solution require more or less hydrochloric acid to neutralize it? Why?
1. One such situation is when the chemical is reactive or can potentially react with other substances present in the drain or sewage system.
2. Adding water to acid can result in a rapid release of heat, known as an exothermic reaction.
3. The neutralization point would depend on the specific reactants and their concentrations.
4. If a stronger solution of sodium bicarbonate (baking soda) was used in beaker C, it would require more hydrochloric acid to neutralize it.
1. There are situations where a chemical needs to be neutralized before being discarded down a drain, even if it has a pH of 7 (neutral pH). One such situation is when the chemical is reactive or can potentially react with other substances present in the drain or sewage system. Even though the chemical may be at a neutral pH, it could react with other chemicals or materials in the plumbing system, leading to the formation of harmful or hazardous byproducts.
For example, some chemicals, even at neutral pH, can react with metals or organic matter present in the drain pipes, resulting in the release of toxic gases or the formation of insoluble precipitates that can clog the plumbing system. To prevent such reactions and potential damage to the plumbing infrastructure, it is necessary to neutralize the chemical before disposal.
2. The reason for adding acid to water rather than water to acid when preparing solutions is safety. Adding water to acid can result in a rapid release of heat, known as an exothermic reaction. This can cause the mixture to splash or boil, leading to potential burns, splattering of acid, or even explosions in extreme cases. By adding acid to water, the heat generated is more easily dissipated and diluted, reducing the risk of accidents.
3. Without specific information about the experiment or the contents of beaker C, it is not possible to determine at what point the solution in beaker C was neutralized. The neutralization point would depend on the specific reactants and their concentrations.
4. If a stronger solution of sodium bicarbonate (baking soda) was used in beaker C, it would require more hydrochloric acid to neutralize it. This is because a stronger solution of sodium bicarbonate contains a higher concentration of the bicarbonate ion (HCO3-), which is the species that reacts with hydrochloric acid to form water and carbon dioxide. A higher concentration of the reactant requires a proportionally higher amount of the acid to achieve neutralization.
Conversely, if a weaker solution of sodium bicarbonate was used in beaker C, it would require less hydrochloric acid to neutralize it. A weaker solution has a lower concentration of bicarbonate ions, which means there are fewer moles of the reactant available for the acid to react with. Therefore, less acid would be needed to achieve neutralization.
It's important to note that the exact quantities and concentrations of the chemicals, as well as the stoichiometry of the reaction, would determine the precise amount of acid required for neutralization in each scenario.
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the FCC metal aluminum has an atomic diameter of 0.286 nm. Calculate the interplanar spacings of (111) for aluminum.
The atomic diameter of the FCC metal aluminum is given as 0.286 nm. We have to determine the interplanar spacings of (111) for aluminum.
Therefore, the given crystallographic plane of aluminum is (111).The interplanar spacings are the perpendicular distances between parallel crystallographic planes.
According to the Bragg equation, the interplanar spacing d of crystallographic planes of a crystal can be calculated as given below:
2dsinθ=nλ
where d is the interplanar spacing,
θ is the angle of incidence,
n is an integer, and
λ is the wavelength of the incident radiation.
Here, we can consider the X-rays with λ=1.54 Å (given in the problem).
As per FCC crystal structure, in the (hkl) plane family, the interplanar spacing, d(hkl) is given by the equation,
d(hkl) = a/√(h²+k²+l²)
where a is the lattice parameter.
As we know, for the (111) plane, the values of h, k, and l are 1, 1, and 1, respectively.
Substituting the values in the above equation, we get
d(111) = a/√(1²+1²+1²)= a/√3
Now, as we know that the diameter of the atom, d_atom is equal to the body diagonal of the unit cell,
we can calculate the lattice parameter as follows:
a = √2 × d_atom
= √2 × 0.286 nm
= 0.404 nm
Putting the value of a in the equation for interplanar spacing of (111), we get,
d(111) = a/√3
= 0.404 nm/√3
= 0.233 nm (approximately)
Therefore, the interplanar spacings of (111) for aluminum is approximately 0.233 nm.
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what is the fundamental difference between an amorphous solid and a crystalline solid?
The fundamental difference between an amorphous solid and a crystalline solid is that a crystalline solid has a definite geometric shape and pattern while an amorphous solid does not have a specific pattern.
The fundamental difference between an amorphous solid and a crystalline solid is that a crystalline solid has a definite geometric shape and pattern while an amorphous solid does not have a specific pattern. Crystalline solids have their atoms or molecules arranged in an orderly fashion with a repeating pattern, creating a three-dimensional structure that is often symmetrical. They have sharp and well-defined melting points and are highly organized.
On the other hand, amorphous solids do not have a definite shape or repeating pattern. They are disordered and random, lacking a well-defined melting point. They are often formed by rapidly cooling a liquid or by depositing molecules from the gas phase. Examples of amorphous solids include glass and rubber, while diamond and salt are examples of crystalline solids.
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