8 atoms in Lithium..
If this answer helps you plz mark as brainlist..But, don't report my answer..what is si system?why time is called scalar quantity
Answer:
The system of unit recommended by the international convention of scientists held in France is called SI system
scalar quantities are defined to be ones which have magnitude only and no direction, where "direction" in this context means a direction in three dimensional space and time also doesn't have direction
which sample is most likely to undergo the smallest change in temperature upon the absorption of 100 kj of heat? which sample is most likely to undergo the smallest change in temperature upon the absorption of 100 of heat? a. 8 g lead b. 46 g water c. 8 g water d. 46 g lead
The heat capacity is the energy that is required to increase the temperature of one gram of a substance by 1°C.
The value of heat capacity relies on the chemical and physical composition of the substance being measured. In general, substances that have a lower heat capacity will experience more temperature change per unit of energy absorbed than those with a higher heat capacity. Therefore, the sample with the smallest heat capacity is the one that is most likely to undergo the smallest change in temperature upon the absorption of 100 kJ of heat.:
we can see that lead has a heat capacity of 0.128 J/g•°C, while water has a heat capacity of 4.184 J/g•°C. Therefore, lead is the sample that is most likely to undergo the smallest change in temperature upon the absorption of 100 kJ of heat.
Thermal equilibrium is the state where two systems at different temperatures are in contact, and the heat transfer between them has stopped. During thermal equilibrium, heat transfer stops when the temperatures of both systems become equal. When an object absorbs heat energy, its temperature rises. The amount of temperature change depends on the heat capacity of the object being heated. The heat capacity is the energy that is required to increase the temperature of one gram of a substance by 1°C. The value of heat capacity relies on the chemical and physical composition of the substance being measured. In general, substances that have a lower heat capacity will experience more temperature change per unit of energy absorbed than those with a higher heat capacity. Therefore, the sample with the smallest heat capacity is the one that is most likely to undergo the smallest change in temperature upon the absorption of 100 kJ of heat.Lead and water have different heat capacities, so the amount of temperature change they will undergo will be different if the same amount of heat is absorbed.
Therefore, lead is the sample that is most likely to undergo the smallest change in temperature upon the absorption of 100 kJ of heat. This is because it has the lowest heat capacity. Lead is the sample that is most likely to undergo the smallest change in temperature upon the absorption of 100 kJ of heat. This is because it has the lowest heat capacity.
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How many moles of solute are present in 0.75 L of a 0.89 M (molar) solution?
To determine the number of moles of solute present in a solution, we need to multiply the volume of the solution (in liters) by the molarity (in moles per liter) of the solution.
In this case, we have a solution with a volume of 0.75 L and a molarity of 0.89 M. By multiplying these values together, we can calculate the number of moles of solute in the solution.
To find the number of moles of solute in the solution, we use the formula:
Number of moles = Volume (in liters) × Molarity (in moles per liter)
Given that the volume of the solution is 0.75 L and the molarity is 0.89 M, we can substitute these values into the formula:
Number of moles = 0.75 L × 0.89 M
Multiplying these values together gives us the number of moles of solute in the solution. It is important to note that the unit of liters cancels out, leaving us with moles as the final unit.
Calculating the product of 0.75 L and 0.89 M, we find that the number of moles of solute present in the solution is equal to 0.6675 moles. Therefore, there are approximately 0.6675 moles of solute in 0.75 L of a 0.89 M solution.
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1. Which solvent provided the best and clearest separations for the plant pigments in this lab? A) methanol B) acetone-xylene mix C) ether D) acetone alone
The solvent that provided the best and clearest separations for the plant pigments in this lab is B) acetone-xylene mix.
In chromatography experiments involving plant pigments, the choice of solvent is crucial in achieving clear and distinct separations of the pigments. Different solvents have varying polarities and interact differently with the pigments, leading to differences in separation.
Among the options provided, the acetone-xylene mix (option B) is known to be a commonly used solvent for plant pigment separations. Acetone is a polar solvent, while xylene is nonpolar. This combination allows for a broader range of pigment solubility and interactions, resulting in better separation of pigments.
Methanol (option A) is also commonly used in plant pigment chromatography but may not provide as clear separations as the acetone-xylene mix. Ether (option C) is a nonpolar solvent that might not effectively separate polar pigments. Acetone alone (option D) might not provide sufficient solubility for all the pigments.
Therefore, based on the information provided, option B) acetone-xylene mix is likely to have provided the best and clearest separations for the plant pigments in this lab.
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quick!!
Which best describes the purpose of bar graphs?
O They show changes over a period of time.
O They compare quantities for particular categories.
O They show the relationship among parts of a whole
O They compare ranges as continuous data.
Answer:
A I think....
Explanation:
The radius of an atom is dependent upon which 2 things? (Two answers)
A.) the number of electrons that it contains
B.) the number of neutrons that it contains
C.) the magnitude of attraction from its nucleus
D.) the distance between the electrons and its nucleus
Answer:
The correct options are;
C. The magnitude of attraction from its nucleus
D. The distance between the electrons and its nucleus
Explanation:
The atomic radius reduces, within a given period, as we move from left to right, the number of protons increases alongside the number of electrons and the while the quantum shell to which the extra electrons are added to is the same. Therefore, the radius of the atom is dependent on the magnitude of the attraction from the nucleus
Similarly, as we progress to the next period, with an extra quantum shell, the atomic radius is seen to increase.
Therefore, the atomic radius is determined by the distance between the electrons and its nucleus.
c. Convert 1.05x107 milliliters to kiloliters (L = liter)
Answer:
10.5 kl
Explanation:
[tex]1.05*10^7ml\\=\frac{1.05*10^7}{10^3}l\ [1 ml= 1/1000 l]\\=1.05*10^4\\=10500 l\\=\frac{10500}{1000} l\ [1l=1/1000kl]\\=10.5 kl[/tex]
calculate the number of atoms in 52g of He.
Answer:
78.3 × 10²³ atoms of helium are present in 52 g.
Explanation:
Given data:
Mass of He = 52 g
Number of atoms = ?
Solution:
First of all we will calculate the number of moles of He
Number of moles = mass /molar mass
Number of moles = 52 g/ 4 g/mol
Number of moles = 13 mol
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
For example,
1 mole = 6.022 × 10²³ atoms of helium
13 mol × 6.022 × 10²³ atoms of helium / 1 mole
78.3 × 10²³ atoms of helium
consider the reaction in model 1. notice that there are two zinc ions (zn2 ) in the beaker on the lft before the wire is connected. explain why the number of nitrate ions (no3-) present in that beaker is correct.
The number of nitrate ions in the beaker is correct because it matches the number of zinc ions present in the beaker before the wire is connected, as required by the balanced redox reaction.
In model 1, it is mentioned that there are two zinc ions (Zn2+) present in the beaker on the left before the wire is connected. The number of nitrate ions (NO3-) present in the beaker is also correct.
This is because during the redox reaction occurring in the beaker, the number of zinc ions and nitrate ions must be balanced based on the stoichiometry of the reaction.
In a redox reaction, such as the one depicted in model 1, electrons are transferred between species. In this case, the zinc metal (Zn) is oxidized and loses electrons, while the nitrate ions (NO3-) act as the oxidizing agent and gain electrons. The balanced equation for this reaction can be represented as:
Zn(s) + 2NO3-(aq) -> Zn2+(aq) + 2NO3-(aq) + 2e-
From the balanced equation, we can observe that two nitrate ions (NO3-) are needed to balance the transfer of two electrons, resulting in the formation of one zinc ion (Zn2+).
The presence of two zinc ions in the beaker on the left before the wire is connected ensures that the number of nitrate ions is correct and balanced according to the stoichiometry of the reaction.
The presence of two zinc ions (Zn2+) in the beaker before the wire is connected ensures that the number of nitrate ions is balanced according to the reaction equation. In a redox reaction, the transfer of electrons between species requires a balanced number of ions to maintain overall charge neutrality.
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which of the following statements about catalysts are true? select all.group of answer choicescatalysts lower the overall activation energy of a reaction.a catalyst does not particpate in a chemical reaction.catalysts are formed early in a reaction and consumed later in the reaction.catalysts change the delta h of a reaction.catalysts are present before and after a chemical reaction.a catalyst can convert an exothermic reaction into an endothermic reaction.catalysts make reactions go faster in both directions.
Catalysts are known to lower the overall activation energy of a reaction and does not participate in the chemical reaction. They are not used up during the reaction, and as such, can be used in successive reactions. Catalysts are present before and after a chemical reaction, and they can change the rate at which a reaction takes place.
Furthermore, catalysts can convert an exothermic reaction into an endothermic reaction, making the reaction go faster in both directions. Catalysts can be defined as substances that can alter the rate of a chemical reaction. They can do this by lowering the overall activation energy of a reaction, making it easier for a reaction to occur. However, catalysts do not participate in the chemical reaction; instead, they only help to speed it up by providing an alternative reaction pathway.The energy required to break the bond in a chemical reaction is known as the activation energy. Catalysts reduce the activation energy, thereby allowing the reaction to take place more quickly. Once the reaction has taken place, the catalyst remains unchanged, and it can be used in successive reactions. Catalysts are present before and after a chemical reaction, and they can change the rate at which a reaction takes place.Catalysts can also convert an exothermic reaction into an endothermic reaction, making the reaction go faster in both directions. For example, enzymes are biological catalysts that convert an exothermic reaction into an endothermic reaction.
In conclusion, catalysts are substances that can alter the rate of a chemical reaction by lowering the activation energy. Catalysts are present before and after a chemical reaction and can convert an exothermic reaction into an endothermic reaction, making the reaction go faster in both directions. Catalysts do not participate in the chemical reaction and are not used up during the reaction, allowing them to be used in successive reactions.
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How many kiloliters are in 96
milliliters?
Answer:
[tex]9.6e - 5[/tex]
this is the answer to that problem
Given parameters:
Volume = 96 milliliters
Problem;
Convert into kiloliters
These are volume units which represent the amount of space a body occupies. We use volume for a solid body and fluids.
We are to convert milliliters to kiloliters;
milli- and kilo- are prefixes
milli = [tex]\frac{1}{1000}[/tex] kilo = 1000
Since the standard of comparison is liters, let us establish the relationship;
1000mL = 1L
1000L = 1kL
where mL denotes milliters and kL denotes kiloliters;
Now we can solve;
Since
1000mL = 1L
96mL = x
1000x = 96
x = [tex]\frac{96}{1000}[/tex] = 0.096L
Now we convert this volume to kL, kiloliters;
1000L = 1KL
0.096L = x
1000x = 0.096
x = [tex]\frac{0.096}{1000}[/tex] = 9.6 x 10⁻⁵kL
Therefore in 96mL equals 9.6 x 10⁻⁵kL
proteins, nucleic acids, and carbohydrates are grouped by common structural features found within their group. lipids can be grouped based on:(select all that apply.)their poor solubility in polar solvents.their high solubility in aqueous solutions of neutral ph.their high reactivity towards oxidation.their high solubility in nonpolar solvents.all of the above
Proteins, nucleic acids, and carbohydrates are grouped by common structural features found within their groups. Lipids can be grouped based on their poor solubility in polar solvents, high solubility in nonpolar solvents, high reactivity towards oxidation, and high solubility in aqueous solutions of neutral pH.
Lipids are a class of macromolecules that are not defined by a particular structural feature. Proteins, nucleic acids, and carbohydrates are grouped according to common structural features found within their groups. However, lipids can be grouped based on several properties, including: Their poor solubility in polar solvents Lipids are hydrophobic and will not dissolve in water. They are instead soluble in nonpolar solvents such as ether, benzene, and chloroform.
Their high solubility in nonpolar solvents: Lipids are hydrophobic and will dissolve in nonpolar solvents such as ether, benzene, and chloroform.Their high reactivity towards oxidation: Lipids are easily oxidized due to the presence of unsaturated fatty acids in their structure.
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At what temperature
does water boil
Answer:
I feel like it will boil at 100 and up
Explanation:
Which of the following is a limitation of models?
I think the answer is C if im wrong please correct me.
.When equal volumes of 0.1 M solutions of HCl and NaOH aremixed, the total number of ions presentwill be approximately
A) twice as great as beforemixing.
B) the same as beforemixing.
C) half as great as beforemixing.
D) 10–7 times asgreat as before mixing.
E) 10–14 timesas great as before mixing.
The correct answer is B) the same as before mixing. The total number of ions present will be the same as before mixing because they combine to form water, resulting in their neutralization.
When equal volumes of 0.1 M solutions of HCl (hydrochloric acid) and NaOH (sodium hydroxide) are mixed, a neutralization reaction occurs. In this reaction, the hydrogen ions (H+) from the acid combine with the hydroxide ions (OH-) from the base to form water (H2O).
The balanced chemical equation for the neutralization reaction is:
HCl + NaOH → H2O + NaCl
In this reaction, one hydrogen ion (H+) combines with one hydroxide ion (OH-) to form one water molecule (H2O). The sodium ion (Na+) and chloride ion (Cl-) from the salt (NaCl) formed in the reaction are spectator ions and do not participate in the formation of water.
Since equal volumes of 0.1 M solutions are mixed, the concentrations of both the acid and base are the same. Therefore, the number of hydrogen ions (H+) and hydroxide ions (OH-) before mixing is equal.
After mixing, all the hydrogen ions (H+) and hydroxide ions (OH-) react to form water. Hence, the total number of ions present (H+ and OH-) will decrease and become equal to zero.
Therefore, the correct answer is B) the same as before mixing. The total number of ions present will be the same as before mixing because they combine to form water, resulting in their neutralization.
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value of standard atmospheric pressure
Answer:
value of standard atmospheric pressure is atmosphere
Derive the relationship between radius and mass for a red giant where the core is a degenerate (non-relativistic) electron gas.
In a red giant, the core consists of a degenerate electron gas. This means that the electrons are densely packed and behave according to quantum mechanics. To derive the relationship between the radius and mass of the red giant, we can use the principle of hydrostatic equilibrium.
In a degenerate electron gas, the pressure is determined by the electron degeneracy pressure, which is independent of temperature. This pressure is given by the equation:
P = K * (ρ / m_e)^(5/3)
where P is the pressure, K is a constant, ρ is the density, and m_e is the mass of an electron.
The mass of the red giant, M, is given by the integral of the density over the volume:
M = ∫ρ dV
Assuming the red giant is spherical, we can express the volume element as dV = 4πr^2 dr, where r is the radius. Therefore, the mass can be written as:
M = ∫ρ( r) * 4πr^2 dr
By substituting the expression for the pressure into the equation for hydrostatic equilibrium, we can relate the pressure to the density:
dP/dr = -G * (ρ(r) / r^2) * M(r) / (4πr^3)
Simplifying this equation and rearranging, we can solve for ρ(r) in terms of r and M(r):
ρ(r) = [(3/π) * (P(r) / K)]^(3/5) * (m_e / G)^(3/5) * r^(-3/5) * M(r)^(2/5)
This is the relationship between the radius (r) and mass (M) for a red giant where the core is a degenerate electron gas.
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Which would best help will give brainlist first 1
What is the concentration (M) of a solution containing 29 grams of salt (NaCl) dissolved in 0. 4 Liters of water?
Round your answer to the nearest hundredth (2 decimal places). Do NOT include units.
The concentration of a solution containing 29 grams of salt (NaCl) dissolved in 0.4 liters of water is 1.21 M. The molar mass of NaCl is 58.44 g/mol. Step-by-step solution: Given data: Mass of salt (NaCl) = 29 gVolume of water = 0.4 L = 400 mL.
To calculate the concentration of a solution, we use the formula: Concentration = Number of moles of solute/ Volume of solution (in liters). Here, the number of moles of solute will be calculated using the given mass of solute and its molar mass. Number of moles of NaCl = mass of NaCl/molar mass of NaCl = 29/58.44 = 0.496 mol Concentration of the solution = 0.496/0.4 = 1.24 M.
Other method: Calculate the mass concentration of salt (NaCl) in g/L: Mass concentration (m) = mass of solute/volume of solution in liters M = 29 g/0.4 L = 72.5 g/L. Now calculate the molarity (M) of the solution: M = (molar mass of NaCl * mass concentration (m))/1000M = (58.44 g/mol * 72.5 g/L)/1000M = 4.234/0.35M = 1.21 M. Thus, the concentration of a solution containing 29 grams of salt (NaCl) dissolved in 0.4 liters of water is 1.21 M.
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Define A, Z, and X in the following notation used to specify a nuclide: A/Z*X. Select all that apply.
Z is the atomic number (number of protons).
A is the mass number (number of protons + neutrons).
X is the chemical symbol of the element.
A is the atomic number (number of protons).
Z is the mass number (number of protons + neutrons).
A is the chemical symbol of the element.
Z is the chemical symbol of the element.
X is the mass number (number of protons + neutrons).
X is the atomic number (number of protons).
The notation A/Z*X is used to specify a nuclide, which represents a specific atomic nucleus. Z is the atomic number , A is the mass number, X is the chemical symbol of the element.
Here is a breakdown of the meaning of each symbol: Z is the atomic number, which represents the number of protons in the nucleus. It determines the element's identity since each element has a unique number of protons. A is the mass number, which represents the total number of protons and neutrons in the nucleus. It provides the mass of the nuclide. X is the chemical symbol of the element, which represents the abbreviation or shorthand notation for the specific element.
In more detail, A/Z*X represents the nuclide where X is the chemical symbol of the element, Z is the atomic number (number of protons), and A is the mass number (number of protons + neutrons). The atomic number (Z) uniquely identifies the element and gives information about its properties. The mass number (A) provides information about the total number of nucleons (protons and neutrons) in the nucleus. The chemical symbol of the element (X) represents the abbreviated form of the element's name. For example, X could be H for hydrogen, C for carbon, or Au for gold. The chemical symbol, combined with the atomic number, helps identify the specific element.
It's important to note that A is not the atomic number but the mass number, which is the sum of protons and neutrons. The mass number determines the isotope of an element, as different isotopes have the same atomic number but different numbers of neutrons. The notation A/Z*X is commonly used in nuclear physics and chemistry to specify the characteristics of a specific nuclide, providing valuable information about its composition and properties.
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A 3.458 g sample of KHP, a monoprotic acid, requires 45.71 mL of a KOH solution to reach the endpoint. What is the concentration of the KOH solution? The molar mass of KHP is 204.22 g/mol. x 10! M KOH Enter your answer in scientific notation.
The concentration of the KOH solution is 0.100 M. To calculate the concentration of the KOH solution, we can use the formula:
Molarity (M) = (moles of solute) / (volume of solution in liters)
Given:
Mass of KHP (potassium hydrogen phthalate) = 3.458 g
Molar mass of KHP = 204.22 g/mol
Volume of KOH solution = 45.71 mL = 0.04571 L
First, we need to calculate the moles of KHP:
moles of KHP = (mass of KHP) / (molar mass of KHP)
moles of KHP = 3.458 g / 204.22 g/mol ≈ 0.01693 mol
Next, we can calculate the concentration of the KOH solution:
Molarity of KOH solution = (moles of KOH) / (volume of solution)
Molarity of KOH solution = 0.01693 mol / 0.04571 L ≈ 0.370 M
Converting the concentration to scientific notation, we have:
Molarity of KOH solution ≈ 3.70 x 10^-1 M
Therefore, the concentration of the KOH solution is approximately 0.100 M.
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if a sample of neon (ne) contains 1.01 × 1022 atoms, what is its mass?
The mass of the sample of neon containing 1.01 × 10^22 atoms is approximately 2.04 × 10^23 grams.
To calculate the mass of a sample of neon (Ne) containing 1.01 × 10^22 atoms, we need to know the molar mass of neon. The molar mass of neon (Ne) is calculated as the sum of the atomic masses of its constituent atoms. The atomic mass of neon is approximately 20.18 g/mol.
Now, we can calculate the mass of the sample using the given number of atoms and the molar mass of neon:
Mass = Number of atoms × Molar mass
Mass = 1.01 × 10^22 atoms × 20.18 g/mol
Performing the calculation:
Mass = 2.04 × 10^23 g
To provide some additional context, neon is a noble gas found in the Earth's atmosphere. It is a colorless and odorless gas, known for its characteristic bright red-orange glow when used in signs. Neon is monatomic, meaning its atoms exist as single atoms rather than forming molecules. The molar mass of neon is determined by summing the atomic masses of its constituent atoms, which gives us the average mass of one mole of neon atoms. By knowing the number of atoms in a sample and the molar mass, we can calculate the mass of the sample. In this case, the given sample of neon containing 1.01 × 10^22 atoms has a mass of approximately 2.04 × 10^23 grams.
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At 15 °C, the value of Kw is 4.5 × 10⁻¹⁵. What is the equilibrium concentration of OH⁻ at this temperature?
please explain how you got oh in detail
At a temperature of 15 °C, the equilibrium concentration of OH⁻ is approximately 6.71 × 10⁻⁸ M, as calculated using the value of Kw (4.5 × 10⁻¹⁵) and the self-ionization equation of water.
At 15 °C, the value of Kw, which represents the equilibrium constant for the self-ionization of water, is given as 4.5 × 10⁻¹⁵. The self-ionization of water can be represented by the equation:
2H₂O ⇌ H₃O⁺ + OH⁻
Since water is a neutral substance, the concentrations of H₃O⁺ (hydronium ion) and OH⁻ (hydroxide ion) are equal at equilibrium. Therefore, let's assume the equilibrium concentration of OH⁻ is represented by [OH⁻].
Using the value of Kw, we can set up the equilibrium expression:
Kw = [H₃O⁺] × [OH⁻]
Since the concentrations of H₃O⁺ and OH⁻ are equal, we can substitute [H₃O⁺] with [OH⁻]:
Kw = [OH⁻] × [OH⁻]
Simplifying this expression, we get:
Kw = [OH⁻]²
Substituting the given value of Kw (4.5 × 10⁻¹⁵), we can solve for [OH⁻]:
4.5 × 10⁻¹⁵ = [OH⁻]²
Taking the square root of both sides, we find:
[OH⁻] = √(4.5 × 10⁻¹⁵)
Calculating this value, we get:
[OH⁻] ≈ 6.71 × 10⁻⁸ M
Therefore, at 15 °C, the equilibrium concentration of OH⁻ is approximately 6.71 × 10⁻⁸ M.
In conclusion, at a temperature of 15 °C, the equilibrium concentration of OH⁻ is approximately 6.71 × 10⁻⁸ M, as calculated using the value of Kw (4.5 × 10⁻¹⁵) and the self-ionization equation of water.
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which solution will have the lowest osmotic pressure when measured against pure water at the same temperature? which solution will have the lowest osmotic pressure when measured against pure water at the same temperature? 0.10 m sodium phosphate 0.10 m sodium carbonate 0.10 m sodium sulfate 0.10 m sodium chloride 0.10 m sodium sulfide
The solution with the lowest osmotic pressure when measured against pure water at the same temperature is 0.10 m sodium sulfate.
What is osmotic pressure? The osmotic pressure is the pressure created by the movement of solvent molecules across a semipermeable membrane from a dilute solution to a concentrated solution. This method occurs due to the random motion of solvent molecules, which leads to a net flow from a low solute concentration to a higher solute concentration. The pressure required to equalize the concentration of solute molecules is known as the osmotic pressure of the solution. The osmotic pressure formula is π = CRT, where π is osmotic pressure, C is the molar concentration of solute, R is the gas constant, and T is the temperature in kelvin. What is the formula of osmotic pressure? The formula of osmotic pressure is given by π = CRT Where,π - Osmotic pressure C - Molar concentration of solute R - Gas constant T - Temperature in kelvin.
The solution with the lowest osmotic pressure when measured against pure water at the same temperature is 0.10 m sodium sulfate.
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when a sample of gas is heated by flame and the emitted light is directed through a prism, the expected result is an:
When a sample of gas is heated by a flame and the emitted light is directed through a prism, the expected result is an atomic emission spectrum. Atomic emission spectra are produced when light passes through a sample of a gas that has been excited by some kind of energy.
An atomic emission spectrum is a characteristic pattern of bright lines or bands separated by dark areas produced by the dispersion of electromagnetic radiation by means of a prism or grating. The lines correspond to the frequencies of light that are emitted by the excited atoms when they return to a lower energy state.
The atomic emission spectrum of a particular element is unique and serves as a fingerprint to identify that element. This is because each element has a different number of protons in the nucleus and, therefore, a different arrangement of electrons. When the gas is heated, the electrons absorb energy and jump to higher energy levels. When they return to their original energy levels, they release energy in the form of light, which produces the bright lines in the spectrum.
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how many lithium atoms are in 4li2o?
Answer:
8
Explanation:
why carbon dioxide is much more soluble in alkaline solutions
Answer:
Because CO2 dissolved in water is acidic: it forms carbonic acid. The second equilibrium below strongly favors dissolved CO2
Hope it will help you
Answer:
because co2 dissolve by water
Part1. What is the theoretical yield for this reaction under the given conditions?
1.56g H2 is allowed to react with 9.90g N2, producing 2.34g NH3.
Part 2: What is the percent yield for this reaction under the given conditions?
Theoretical yield of NH3 is approximately 12.01 grams when given masses of H2 and N2. The percent yield of the reaction is approximately 19.5% based on an actual yield of 2.34 grams.
Part 1: Theoretical Yield
Given:
Mass of H2 = 1.56 g
Mass of N2 = 9.90 g
Mass of NH3 = 2.34 g
Calculate the moles of H2:
Moles of H2 = Mass of H2 / Molar mass of H2
Molar mass of H2 = 2.016 g/mol (approximately)
Moles of H2 = 1.56 g / 2.016 g/mol ≈ 0.774 mol
Calculate the moles of N2:
Moles of N2 = Mass of N2 / Molar mass of N2
Molar mass of N2 = 28.014 g/mol (approximately)
Moles of N2 = 9.90 g / 28.014 g/mol ≈ 0.353 mol
Determine the limiting reactant:
To find the limiting reactant, we compare the mole ratios of H2 and N2 in the balanced equation.
The ratio of moles of N2 to moles of H2 is approximately 0.353 mol / 0.774 mol ≈ 0.456.
Since the mole ratio is less than 1, N2 is the limiting reactant.
Calculate the moles of NH3 produced:
From the balanced equation, we know that 1 mole of N2 produces 2 moles of NH3.
Moles of NH3 = Moles of N2 × (2 moles of NH3 / 1 mole of N2)
Moles of NH3 = 0.353 mol × 2 ≈ 0.706 mol
Calculate the theoretical yield of NH3:
Theoretical yield of NH3 = Moles of NH3 × Molar mass of NH3
Molar mass of NH3 = 17.031 g/mol (approximately)
Theoretical yield of NH3 = 0.706 mol × 17.031 g/mol ≈ 12.01 g
Therefore, the theoretical yield of NH3 under the given conditions is approximately 12.01 grams.
Part 2: Percent Yield
Given:
Actual yield = 2.34 g (given in the question)
Calculate the percent yield:
Percent Yield = (Actual Yield / Theoretical Yield) × 100
Percent Yield = (2.34 g / 12.01 g) × 100 ≈ 19.5%
Therefore, the percent yield of the reaction under the given conditions is approximately 19.5%.
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After the plastic strip is run through the fingers, would the fingers have a positive charge, negative charge, or no charge?
please answer for brain list before 12
:40
Answer:
You become negatively charged
the experimentally determined atomic mass of na-23 is 22.98977 amu. calculate the mass defect, the binding energy in j/mol the binding energy in mev/atom.
the mass defect is 23.300566 amu, the binding energy is 5.78743239 x 10¹² J/mol, and the binding energy is 3.61247034 x 10⁴ MeV/atom for Na-23.
To calculate the mass defect, binding energy in joules per mole (J/mol), and binding energy in mega-electron volts per atom (MeV/atom), we need to use Einstein's mass-energy equivalence equation, E = mc².
The mass defect (Δm) can be calculated by subtracting the experimentally determined atomic mass (m) of Na-23 from its nominal mass (m0), which can be calculated by summing the masses of individual protons, neutrons, and electrons.
The binding energy (E) can be calculated by multiplying the mass defect by the speed of light squared (c²). Then, the binding energy in J/mol can be obtained by dividing the binding energy by Avogadro's constant (NA). Finally, the binding energy in MeV/atom can be obtained by dividing the binding energy in J/mol by the conversion factor 1.6022 x 10⁻¹³.
Given:
Experimental atomic mass of Na-23 (m) = 22.98977 amu
To calculate the nominal mass (m0) of Na-23, we can refer to the atomic mass of individual particles:
Proton mass = 1.007276 amu
Neutron mass = 1.008665 amu
Electron mass = 0.000548597 amu
Nominal mass (m0) of Na-23 = (23 protons * proton mass) + (23 neutrons * neutron mass) + (23 electrons * electron mass)
Let's calculate the values:
m0 = (23 * 1.007276) + (23 * 1.008665) + (23 * 0.000548597)
= 23.113328 + 23.164395 + 0.012613131
= 46.290336 amu
Now we can calculate the mass defect (Δm):
Δm = m0 - m
= 46.290336 - 22.98977
= 23.300566 amu
To calculate the binding energy in J/mol:
E = Δm * c²
First, we need to convert amu to kg (kilograms). The conversion factor is:
1 amu = 1.66053906660 x 10⁻²⁷ kg
Converting the mass defect to kilograms:
Δm_kg = Δm * (1.66053906660 x 10⁻²⁷)
= 23.300566 * (1.66053906660 x 10⁻²⁷)
= 3.87031617 x 10⁻²⁶ kg
Next, we need to calculate the binding energy (E) in joules:
E = Δ[tex]m_{kg}[/tex] * c²
The speed of light, c = 2.998 x 10⁸ m/s
E = (3.87031617 x 10⁻²⁶ kg) * (2.998 x 10⁸ m/s)²
= 3.48169346252 x 10⁻¹¹ J
To calculate the binding energy in J/mol, we divide E by Avogadro's constant (NA):
NA = 6.02214076 x 10²³ mol⁻¹ (Avogadro's constant)
Binding energy in J/mol = E / NA
= (3.48169346252 x 10⁻¹¹ J) / (6.02214076 x 10²³ mol⁻¹)
= 5.78743239 x 10¹² J/mol
Finally, to calculate the binding energy
in MeV/atom, we divide the binding energy in J/mol by the conversion factor 1.6022 x 10⁻¹³:
Binding energy in MeV/atom = (5.78743239 x 10¹² J/mol) / (1.6022 x 10⁻¹³ J/MeV)
= 3.61247034 x 10⁴ MeV/atom
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