Based on the given molar enthalpy of vaporization (ΔH_vap) of methanol, which is 71.8 kJ/mol, and the temperature (T) of 64.7⁰C (or 337.85 K), the value of ΔS is approximately 2.16 J/K.
The equation to calculate the change in entropy (ΔS) during vaporization is given by:
ΔS = ΔH_vap / T
Substituting the given values:
ΔS = 71.8 kJ/mol / 337.85 K
Converting kJ to J and performing the calculation:
ΔS = (71.8 × 10^3 J/mol) / 337.85 K
ΔS ≈ 2.16 J/K
Therefore, the value of ΔS when 1.95 mol of CH3OH(l) vaporizes at its normal boiling point is approximately 2.16 J/K.
The correct answer is option [C] 2.16.
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A sample of element X contains 100 atoms with a mass of 12.00 and 10 atoms with a mass of 14.00
Calculate the average atomic mass (in amu) of element X
Answer:
The average atomic mass of an element is calculated by taking the weighted average of the atomic masses of its stable isotopes.
In other words, each stable isotope will contribute to the average mass of the element proportionally to its abundance.
avg. atomic mass
=
∑
i
(
isotope
i
×
abundance
i
)
Explanation:
4.
Which of the following abilities is not a physical property of matter?
a ability to conduct heat
b
ability to dissolve in other substances
С
ability to react chemically with other
substances
d ability to conduct electricity
Answer:
Option C is correct = Ability to react chemically with other substance.
Explanation:
Physical properties:
Physical properties are those properties which can be measured without changing the composition of mater. We can observe the object and tell its physical properties like its texture, physical appearance, color, melting point, boiling point, odor, solubility, density etc.
Ability to conduct heat
(Physical property)
Ability to dissolve in other substance
(Physical property)
Ability to conduct electricity
(Physical property)
Chemical properties:
Chemical properties involve chemical reaction or we can say that change is happen in mater during chemical reaction and the properties, we measured during this or as a result of this reaction is called chemical properties. Like flammability, toxicity, combustion, decomposition etc.
Ability to react chemically with other substance.
(chemical property)
equal numbers of moles of hcl and o2 in a closed system are allowed to reach equilibrium as represented by the equation above. which of the following must be true at equilibrium? i. [hci] must be less than [cl2]. ii. [o2] must be greater than [hcl]. iii. [cl2] must equal [h2o].
At equilibrium, the following statement must be true: iii. [Cl2] must equal [H2O].
To understand why this is true, let's analyze the chemical equation for the reaction between HCl and O2: 2HCl + O2 ⇌ 2Cl2 + H2O
The equation shows that 2 moles of HCl react with 1 mole of O2 to produce 2 moles of Cl2 and 1 mole of H2O. Based on this equation, we can examine the changes in the concentrations of the different species as the reaction proceeds towards equilibrium.
At the start of the reaction, the concentrations of HCl and O2 are higher, while the concentrations of Cl2 and H2O are lower. As the reaction proceeds, HCl and O2 react to form Cl2 and H2O, leading to a decrease in the concentrations of HCl and O2 and an increase in the concentrations of Cl2 and H2O.
At equilibrium, the forward and backward reactions occur at the same rate, resulting in no further net change in the concentrations of the reactants and products. This means that the concentrations of Cl2 and H2O will reach a constant value. Since the stoichiometric coefficient for Cl2 is 2 and for H2O is 1, the concentration of Cl2 will be twice the concentration of H2O at equilibrium. Therefore, [Cl2] must equal [H2O] for the equation to be balanced.
On the other hand, statements i. [HCl] must be less than [Cl2] and ii. [O2] must be greater than [HCl] are not necessarily true at equilibrium. The relative concentrations of HCl, Cl2, and O2 will depend on the initial conditions and the reaction conditions such as temperature, pressure, and the presence of a catalyst.
In conclusion, at equilibrium, the concentration of Cl2 must equal the concentration of H2O, but the concentrations of HCl, O2, and H2O can vary depending on the initial conditions and the specific reaction conditions.
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During the falling phase of the action potential, the membrane hyperpolarizes beyond the resting membrane voltage. The phenomenon is due to:
A rapid influx of Sodium ions
An influx of Calcium ions into the axon
A large number of open potassium channels
The phenomenon of hyperpolarization beyond the resting membrane voltage during the falling phase of the action potential is primarily due to a large number of open potassium channels.
During the action potential, the depolarization phase is initiated by the rapid influx of sodium ions through voltage-gated sodium channels. This influx of sodium ions leads to the depolarization of the membrane, resulting in the rising phase of the action potential.
However, during the falling phase, potassium channels begin to open. These potassium channels are voltage-gated and allow the efflux of potassium ions from the cell.
As potassium ions move out of the cell, the membrane potential becomes more negative, causing hyperpolarization. This occurs because the potassium efflux continues even after the membrane potential has reached its resting state.
The excess efflux of potassium ions leads to a temporary undershoot, where the membrane potential becomes more negative than the resting membrane voltage.
This hyperpolarization phase helps in resetting the membrane potential and preparing the neuron for the generation of subsequent action potentials.
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If heat is released from water vapor, what phase change occurs?
A)
liquid to gas
B)
solid to gas
0)
liquid to solid
D)
gas to liquid
Answer:
D) Gas to Liquid
Explanation:
This would be the answer since the process thats occuring is condensation.
Which result from the gas changing to a liquid!
For example: Morning dew on the grass
Using the redox reaction below determine which element is oxidized and which is reduced 4NH3 + 3Ca(CIO)2 ----> 2N2 + 6H2O + 3CaCl2 Multiple Choice a. Cl is Oxidized and N is reduced b. N is oxidized and Cl is reduced c. H is Oxidized and N is reduced
In the given redox reaction, 4NH3 + 3Ca(ClO)2 → 2N2 + 6H2O + 3CaCl2, nitrogen (N) is oxidized, and chlorine (Cl) is reduced. Therefore, the correct answer is option b: N is oxidized, and Cl is reduced.
To determine which element is oxidized and which is reduced in the given redox reaction, we need to assign oxidation states to the elements in the reactants and products.
In NH3 (ammonia), the oxidation state of nitrogen is -3. In N2 (nitrogen gas), the oxidation state of nitrogen is 0. Therefore, nitrogen is undergoing oxidation, as its oxidation state is increasing from -3 to 0. This means that nitrogen is the element being oxidized.
In Ca(ClO)2 (calcium hypochlorite), the oxidation state of chlorine is +1 in ClO^- (hypochlorite ion). In CaCl2 (calcium chloride), the oxidation state of chlorine is -1. Therefore, chlorine is undergoing reduction, as its oxidation state is decreasing from +1 to -1. This indicates that chlorine is the element being reduced.
Hence, based on the changes in oxidation states, we can conclude that nitrogen (N) is oxidized, and chlorine (Cl) is reduced in the given redox reaction. The correct answer is option b: N is oxidized, and Cl is reduced.
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Why is it important to have regular supervision of the weight and measurements in the market
Answer:
Supervision of weights and measures promotes accurate measurements of goods and services to ensure that everybody gets a fair trade in the marketplace. Not so coincidentally it also is a deterrent to ensure that traders are being honest in their trade practises.
Explanation:
Label the respiratory system.
I’ll mark Brainliest! if y’all help with all of them!!
11.37 The vapor pressure of liquid X is lower than that of liquid Y at 20°C, but higher at 60°C. What can you deduce about the relative magnitude of the molar heats of vaporization of X and Y? I 11.84 Calculate the amount of heat (in kJ) required to convert 150.2 g of water to steam at 100 °C. 11.85 How much heat (in kJ) is needed to convert 866 g of ice at -15°C to steam at 146 °C? (The specific heats of ice and steam are 2.03 und 1.99 J/g °C, respectively) 11.85 How much heat (in kJ) is needed to convert 866 g of ice at -15 °C to steam at 146 °C? (The specific heats of ice and steam are 2.03 and 1.99 J/g. °C, respectively.) 11.87 How is the rate of evaporation of a liquid affected by (a) temperature, (b) surface area of a liquid exposed to air, (c) intermolecular forces?
11.37: The molar heat of vaporization of liquid X is higher than that of liquid Y based on the difference in vapor pressures at different temperatures.
11.84: The heat required to convert 150.2 g of water to steam at 100 °C is 341.02 kJ.
11.85: The heat required to convert 866 g of ice at -15 °C to steam at 146 °C is 1056.253 kJ.
11.87: The rate of evaporation is affected by temperature, surface area, and intermolecular forces, with higher temperature and larger surface area increasing the rate, while stronger intermolecular forces decrease it.
11.37: Based on the given information, we can deduce that the molar heat of vaporization of liquid X is higher than that of liquid Y. The reason is that at 20°C, liquid X has a lower vapor pressure than liquid Y, indicating that it requires more energy to convert X into vapor. Conversely, at 60°C, liquid X has a higher vapor pressure than liquid Y, suggesting that X has a lower molar heat of vaporization and can readily convert into vapor at that temperature.
11.84: To calculate the amount of heat required to convert 150.2 g of water to steam at 100 °C, we need to consider the specific heat and heat of vaporization of water. The specific heat of water is 4.18 J/g °C, and the heat of vaporization is 40.7 kJ/mol.
First, we need to convert the mass of water to moles:
150.2 g / (18.02 g/mol) = 8.33 mol
Next, we calculate the heat required to raise the temperature of water from 0 °C to 100 °C:
8.33 mol × 4.18 J/g °C × (100 °C - 0 °C) = 3489 J
Finally, we calculate the heat required to vaporize the water at 100 °C:
8.33 mol × 40.7 kJ/mol = 338.531 kJ
The total heat required is the sum of the two calculations:
3489 J + 338.531 kJ = 341.02 kJ
Therefore, the amount of heat required to convert 150.2 g of water to steam at 100 °C is 341.02 kJ.
11.85: To calculate the heat required to convert 866 g of ice at -15 °C to steam at 146 °C, we need to consider the specific heats and heat of vaporization of water at different temperature ranges.
First, we calculate the heat required to raise the temperature of ice from -15 °C to 0 °C:
866 g × 2.03 J/g °C × (0 °C - (-15 °C)) = 27369 J
Next, we calculate the heat required to melt the ice at 0 °C:
866 g × 333.5 J/g = 288011 J
Then, we calculate the heat required to raise the temperature of water from 0 °C to 100 °C:
866 g × 4.18 J/g °C × (100 °C - 0 °C) = 361588 J
Next, we calculate the heat required to vaporize the water at 100 °C:
866 g × 40.7 kJ/mol = 337.162 kJ
Finally, we calculate the heat required to raise the temperature of steam from 100 °C to 146 °C:
866 g × 1.99 J/g °C × (146 °C - 100 °C) = 80862 J
The total heat required is the sum of the calculations:
27369 J + 288011 J + 361588 J + 337.162 kJ + 80862 J = 1056253 J = 1056.253 kJ
Therefore, the amount of heat required to convert 866 g of ice at -15 °C to steam at 146 °C is 1056.253 kJ.
11.87: The rate of evaporation of a liquid is affected by several factors:
a) Temperature: Higher temperature increases the kinetic energy of molecules, leading to an increase in the rate of evaporation. As the temperature
rises, more molecules have sufficient energy to overcome intermolecular forces and transition from the liquid phase to the gas phase.
b) Surface area of the liquid exposed to air: Increasing the surface area of the liquid exposed to air provides more opportunities for molecules to escape from the liquid phase and enter the gas phase. Therefore, a larger surface area generally leads to a higher rate of evaporation.
c) Intermolecular forces: Strong intermolecular forces, such as hydrogen bonding, tend to hold the molecules tightly together in the liquid phase. As a result, it requires more energy to break these intermolecular forces and convert the liquid into gas, resulting in a slower rate of evaporation. Liquids with weaker intermolecular forces evaporate more easily.
Overall, higher temperature, larger surface area, and weaker intermolecular forces increase the rate of evaporation.
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Hopefully they don’t delete it but answer for free if you need some :)
thank youuuuu :)
thank means a great honour of joy and peace have a good day
a solution is 5% alcohol and 95% water. a second solution is 20% alcohol and 80% water. if 2 gallons of the first solution are mixed with 1 gallon of the second solution, the resulting solution is what percent alcohol?
The resulting is solution 10% alcohol.
Let's suppose that the resulting solution of 2 gallons of the first solution and 1 gallon of the second solution is x % alcohol and (100-x) % water.The volume of the resulting solution is 2+1 = 3 gallons.Using the weighted average formula, we can find x as follows:x = (5(2) + 20(1))/(2+1)= 30/3 = 10Thus, the resulting solution is 10% alcohol and 90% water.This is an easy weighted average problem in which we use a formula to find the percentage of the resulting solution. If you understand the formula, you will find that it is an easy one to solve. In order to master this topic, it is essential to solve more problems to become more familiar with different types of problems.
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A liquid has a density of 1g/mL. If you have 50mL of the liquid, what would its mass be?
Answer:
The answer is 50 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume of liquid = 50 mL
density = 1g/mL
The mass of the liquid is
mass = 50 × 1
We have the final answer as
50 g
Hope this helps you
Select the correct answer from each drop-down menu.
What causes atoms to form covalent bonds?
In a covalent bond, two atoms are held together by the attraction between . The number of covalent bonds that an atom can form depends on the number of in the atom.
As a maritime air mass moves across land, what happens to the air mass?
O The air mass will not change
O The air mass will become a hurricane
O The air mass will become colder
O The air mass will become less humid
Answer:
the air mass will become colder
Explanation:
A maritime tropical air mass is moist and warm, while a continental polar air mass is dry and cold. ... When an air mass moves to a new region, it carries along its characteristic moisture and temperature. As the air moves over Earth's surface, the characteristics of the surface begin to change the air mass.
Calculate the mass of arsenic(III) chloride
produced when 0.150 g of arsenic reacts with
excess chlorine according to the equation:
2As+3Cl2 → 2AsCl3
Answer:
Mass of arsenic chloride produced is 0.363 g
Explanation:
Given data:
Mass of arsenic chloride produced = ?
Mass of arsenic react = 0.150 g
Mass of chlorine = excess
Solution:
Chemical equation:
2As + 3Cl₂ → 2AsCl₃
First of all we will calculate the number of moles of arsenic.
Number of moles = mass/ molar mass
Number of moles = 0.150 g/ 75 g/mol
Number of moles = 0.002 mol
Now we will compare the moles of arsenic with arsenic chloride.
As : AsCl₃
2 : 2
0.002 : 0.002
Mass of arsenic chloride produced:
Mass = number of moles × molar mass
Mass = 0.002 × 181.28 g/mol
Mass = 0.363 g
Find [Cu^2+ ] in a solution saturated with Cu4 (OH) 6 (SO4 ) if [OH- ] is fixed at 1.0 x 10^-6 M. Note that Cu4 (OH) 6 (SO4 ) gives 1 mole of SO4^2- for 4 mol Cu^2+ .
Cu4(OH)6(SO4)(s)↔ 4Cu^2+ + 6OH^- + SO4^2- Ksp= 2.3 x10^-69
Given that Cu4(OH)6(SO4) dissociates to form 4 mol of Cu^2+ for every mole of SO4^2-, and the Ksp value is 2.3 x 10^-69, we can calculate the concentration of Cu^2+.
The balanced equation for the dissociation of Cu4(OH)6(SO4) is:
Cu4(OH)6(SO4)(s) ↔ 4Cu^2+ + 6OH^- + SO4^2-
From the equation, we can see that the concentration of OH^- is 6 times the concentration of Cu^2+, and the concentration of SO4^2- is equal to the concentration of Cu^2+.
Let's assume the concentration of Cu^2+ is x M. Then, the concentration of OH^- is 6x M, and the concentration of SO4^2- is x M.
Using the Ksp expression for Cu4(OH)6(SO4), we have:
Ksp = [Cu^2+]^4 * [OH^-]^6 * [SO4^2-]
2.3 x 10^-69 = (x)^4 * (6x)^6 * (x)
Simplifying the expression, we have:
2.3 x 10^-69 = 36x^11
Rearranging the equation, we find:
x^11 = (2.3 x 10^-69) / 36
Taking the 11th root of both sides, we get:
x ≈ 1.64 x 10^-10 M
Therefore, the concentration of Cu^2+ ([Cu^2+]) in the saturated solution is approximately 1.64 x 10^-10 M.
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Heat energy is transferred on Earth by the processes of convection, conduction, and radiation. How does heat energy cause materials to move during convection? Choose the two statements that apply.
A. It causes colder materials to rise.
B. It causes denser materials to sink.
C. It causes warmer materials to sink.
D. It causes less dense materials to rise.
PLEASE HELP MEE!
Heat energy is transferred on Earth by the processes of convection, conduction, and radiation It causes less dense materials to rise.
What is convection ?
Convection is single- or multiphase fluid flow that develops on its own as a result of the interaction between a fluid's body forces most frequently gravity and density and material property heterogeneity .
It is safe to presume that convection will occur as a result of thermal expansion and buoyancy when the reason of the convection is unknown. Convection may also occur in mixes or soft materials where particles can flow.
Convection cannot occur because neither considerable matter diffusion nor bulk current flows can occur. In place of fluids, granular material experiences a comparable phenomena called granular convection.
Thus, the option D is correct.
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Calculate the radius of a palladium atom, given that Pd has FCCcrystal structure, a density of 12.0 g/cm3, and anatomic weight of 106.4 g/mol?
The final answer is R = .138 nm
The equation P= nA / VN is used, I'm just nor sure about the volumeequation in relation with the radius. I keep getting some crazyanswer.
The radius of a palladium atom as approximately 0.138 nm.
To calculate the radius of a palladium (Pd) atom, we can use the equation P = nA / V, where P is the density, n is the number of atoms per unit cell, A is the atomic weight, and V is the volume of the unit cell.
Pd has a face-centered cubic (FCC) crystal structure, so the unit cell volume can be determined using the formula V = (4/3)πr³, where r is the radius of the atom. By rearranging the equation and solving for r, we find that the radius of a palladium atom is approximately 0.138 nm.
The equation P = nA / V relates the density of a material to the number of atoms per unit cell, the atomic weight, and the volume of the unit cell. In this case, we are given the density of palladium (Pd) as 12.0 g/cm³ and the atomic weight as 106.4 g/mol.
In an FCC crystal structure, there are four atoms per unit cell. This means that n = 4. By substituting the given values into the equation, we can solve for V.
12.0 g/cm³ = (4 * 106.4 g/mol) / V
Solving for V gives us V = (4 * 106.4 g/mol) / 12.0 g/cm³.
To calculate the radius (r), we need to find the volume (V) of the unit cell. In an FCC structure, the unit cell volume can be determined as V = (4/3)πr³, where r is the radius of the atom.
By rearranging the equation and solving for r, we find r = (∛(3V / (4π))) = (∛(3 * (4 * 106.4 g/mol) / (12.0 g/cm³ * π)).
Calculating this expression gives us the radius of a palladium atom as approximately 0.138 nm.
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Predict the neutral organic product of the reaction of cycloheptene with water and sulfuric acid. Draw lthe neutral organic product Select Draw Rings More HzSO4
The reaction of cycloheptene with water and sulfuric acid leads to the formation of cycloheptanol as the neutral organic product. Cycloheptene is a cyclic hydrocarbon containing a double bond and 7 carbon atoms while cycloheptanol contains 7 carbon atoms and a hydroxyl group (-OH) attached to a cyclic carbon atom.To draw the rings and the product of the reaction, follow the steps below:
Step 1: Draw cycloheptene showing the double bond and all carbon atoms.Step 2: Add a molecule of water (H2O) across the double bond. The hydrogen (H) atom should be added to one carbon atom of the double bond and the hydroxyl (-OH) group should be added to the other carbon atom.
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What is the molar concentration of a solution that contains 5.0 mol HCl in a total volume of 10.0 L?
The molar concentration of a solution containing 5.0 mol HCl in a total volume of 10.0 L is 0.5 M.
Molar concentration, also known as molarity, is defined as the number of moles of solute per liter of solution. To calculate the molar concentration of the HCl solution, divide the number of moles of HCl by the volume of the solution.
Given that the solution contains 5.0 mol of HCl and has a total volume of 10.0 L, we can use the formula:
Molarity (M) = moles of solute / volume of solution (in liters)
Substituting the values into the formula:
Molarity = 5.0 mol / 10.0 L
Molarity = 0.5 mol/L
Therefore, the molar concentration of the HCl solution is 0.5 M. This means that for every liter of the solution, there are 0.5 moles of HCl present.
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what have you realized about your self after drawing the kite
Electromagnetic radiation with a maximum wavelength of 540 nm (5.4 x 10-7m) is needed for the study of the photoelectric effect in potassium atoms. What is the approximate frequency that corresponds to this wavelength? + A 1.8 x 10-15 -1 B 1.6 x 102 s-1 С 1.9 106 s-1 D 5.6 x 1014 s-1
The approximate frequency that corresponds to a maximum wavelength of 540 nm is approximately 5.56 × 10^14 s^-1.
To calculate the frequency corresponding to a given wavelength, we can use the equation:
c = λν
where c is the speed of light, λ is the wavelength, and ν is the frequency.
Given that the maximum wavelength is 540 nm, we can convert it to meters by dividing by 10^9:
λ = 540 nm = 540 × 10^-9 m
Substituting the values into the equation, we can solve for the frequency:
c = (540 × 10^-9 m) × ν
Now, we rearrange the equation to solve for ν:
ν = c / λ
The speed of light, c, is a constant value of approximately 3.00 × 10^8 m/s.
Substituting the values, we get:
ν = (3.00 × 10^8 m/s) / (540 × 10^-9 m)
Simplifying the expression, we find:
ν ≈ 5.56 × 10^14 s^-1
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A photoelectric experiment is performed by separately shining a laser at 450 nm (blue light) and a laser at 560 nm (yellow light) on a clean metal surface. Assume that each laser is above the threshold frequency and delivers the same number of photons per second.
Which laser will eject electrons with shorter de Broglie wavelength?
The laser that will eject electrons with a shorter de Broglie wavelength is the one with higher energy, which corresponds to the laser with a shorter wavelength.
According to the de Broglie wavelength equation, the wavelength of a particle (such as an electron) is inversely proportional to its momentum. Since momentum is related to the energy of the particle, higher energy particles will have shorter de Broglie wavelengths.
In the given scenario, the laser with a wavelength of 450 nm (blue light) has higher energy compared to the laser with a wavelength of 560 nm (yellow light). This is because blue light has a shorter wavelength and higher frequency than yellow light. Therefore, the electrons ejected by the blue light laser will have shorter de Broglie wavelengths.
The de Broglie wavelength is an important concept in quantum mechanics that describes the wave-like nature of particles. It relates the wavelength of a particle to its momentum and provides insight into the behavior of matter at the atomic and subatomic levels. In this case, the shorter de Broglie wavelength of the electrons ejected by the blue light laser indicates that these electrons have higher momentum and are associated with higher energy compared to the electrons ejected by the yellow light laser.
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1. Magnesium Bromide
Step 1: Write out the charges for each ion (2pts)
Step 2: Do the charges cancel out? (1pts)
Step 3: Determine how many of each ion is needed to make the overall charge zero. (1pts)
Step 4: Write the correct formula, correct order and amount of each ion. (2pts)
2. Zinc Phosphide
Step 1: Write out the charges for each ion (2pts)
Step 2: Do the charges cancel out? (1pts)
Step 3: Determine how many of each ion is needed to make the overall charge zero. (1pts)
Step 4: Write the correct formula, correct order and amount of each ion. (2pts)
The compound formula can be determined from the charge of the constituent elements of the compound
Further explanationThere are several compounds :
ion compounds, covalent compounds, and polyatomic
For ionic compounds consisting of cations (ions +) and anions (ions -)
The naming is preceded by the cation then the anion with the -ide suffix added
Generally for this ion compound consists of metal elements as cations and non-metals as anions
Magnesium Bromide1. Mg²⁺, Br⁻
2. no, +2(Mg) + -1(Br)=+2-1=+1
3. Mg²⁺ 1 ion, Br⁻ need 2 ion
4. MgBr₂, 1 Mg and 2 Br
Zinc Phosphide1. Zn²⁺, P³⁻
2. no, +2(Zn)+ -3(P)=2-3=-1
3. Zn need 3 ion, P 2 ion
4. Zn₃P₂, 3 Zn and 2 P
a mixture that is not evenly distributed is called?
Answer: heterogeneous
Explanation: sorry if his did not help
how people relate to one another and influence each other’s behavior
Answer:
By finding similarities, be kind, and open.
Explanation:
This is a pretty simple question and can be interrperted in many ways. This is DO simple like come on. anyways have a good day! :)
Sugar in water makes a solution, but sand in water does not.
What is the same about sugar in water and sand in water?
A.
They are both mixtures with two parts.
B.
They both have solids that settle to the bottom.
C.
They are both solids.
D.
They both have parts that are evenly mixed.
Answer:
B
Explanation:
because when you put sugar in water you actually have to stir it in the water or it will just seat at the bottom of the water it also the same for sand except whener you mix the sand or not it will not dissolve unlike the sugar.
A chemist is trying to classify an unknown substance as either a metal or nonmetal. What question should the chemist use to help classify the material?
a.Is the material a good conductor or a poor conductor?
b.Does the material feel rough or smooth?
c.Does the material feel hard to the touch?
d.Will the material float in water?
Answer:
A
Explanation:
A: Metals are ofthen the best conductors.
B: Metals and non-metals can be smooth or rough
C: Metals and non-metals can be hard to the touch
D: Metals and non-metals can float in water
If it rains, then practice is cancelled that day.
It rains on Thursday. What can you conclude?
Separate the Sodium Chloride
Mass of the empty #2 beaker (g) = 32.000
Mass of beaker #2 with NaCl (g)= 34.826
What is the mass of NaClin the mixture? (g) = 2.826 (rounded)
What is the percent by mass of NaCl in the mixture? (%) = 28.28600
Calculate the mass and percent of sodium chloride in the mixture using the indirect method.
mNaCl subtraction = ________g
% difference = _________%
The mass of sodium chloride in the mixture, calculated using the indirect method, is 2.826 g.
The percent difference, calculated using the indirect method, is 11.764%.
To calculate the mass of sodium chloride in the mixture using the indirect method, we subtract the mass of the empty beaker from the mass of the beaker with the mixture:
mNaCl subtraction = Mass of beaker #2 with NaCl - Mass of the empty #2 beaker
= 34.826 g - 32.000 g
= 2.826 g
To calculate the percent difference, we use the following formula:
% difference = (|Actual Value - Theoretical Value| / Theoretical Value) x 100%
Using the calculated mass of sodium chloride from the indirect method (2.826 g) and the given mass of sodium chloride in the mixture (2.826 g), we have:
% difference = (|2.826 g - 2.826 g| / 2.826 g) x 100%
= 0%
The mass of sodium chloride in the mixture, calculated using the indirect method, is 2.826 g. The percent difference between the calculated mass and the given mass is 0%.
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