Question 1

Each of three identical 15.0-L gas cylinders contains 7.50 mol of gas at 295 K.Cylinder A contains Ar,cylinder B contains Cl₂,and cylinder C contains N₂.According to the kinetic molecular theory,which gas has the highest density?

Accepted Answer

Density is mass per unit volume. Since all cylinders have the same volume and number of moles, the gas with the highest molar mass will have the highest density. Cl₂ has the highest molar mass among the three gases.

Question 2

The ozone molecules in the stratosphere absorb much of the ultraviolet radiation from the sun,protecting life on Earth.At a certain altitude,the temperature of the stratosphere is 240 K and the partial pressure of ozone is 1.4 × 10^-7 atm.Calculate the number of ozone molecules present in 1.00 L of atmosphere at that altitude.

Accepted Answer

To calculate the number of ozone molecules present, we can use the Ideal Gas Law, PV=nRT, where P is the pressure, V is the volume, n is the number of molecules, R is the gas constant, and T is the temperature in Kelvin. Rearranging the equation to solve for n, we get n=PV/RT. 
Plugging in the values given, we get n=(1.4x10^-7 atm)(1 L)/(0.08206 L atm/mol K)(240 K)= 3x10^15 molecules of ozone in 1.00 L of atmosphere. 
Therefore, the answer is B, 3x10^15 molecules of ozone.

Question 3

According to the kinetic molecular theory,the pressure of a gas in a container will decrease if the

Accepted Answer

According to the kinetic molecular theory, if the temperature of the gas decreases, the average velocity of the gas particles decreases. As a result, the particles will strike the walls of the container less frequently, leading to a decrease in pressure. Therefore, option C is the correct answer. Option A is incorrect as an increase in the number of collisions with the container wall will result in an increase in pressure. Option B is incorrect as the number of moles of gas does not affect the pressure of the gas in the container. Option D is incorrect as a decrease in volume will lead to an increase in pressure according to Boyle's law.

Question 4

The mixing of different gases by random molecular motion with frequent collisions is called

Accepted Answer

Diffusion is the process in which molecules or ions of different substances mix by random molecular motion. The movement of molecules or ions from an area of high concentration to an area of low concentration is due to the random collision of molecules.

Question 5

A 0.500 g sample containing Ag₂O and inert material is heated,causing the silver oxide to decompose according to the following equation: 2 Ag₂O(s)→ 4 Ag(s)+ O₂(g) If 13.8 mL of gas are collected over water at 27°C and 1.00 atm external pressure,what is the percentage of silver oxide in the sample? The partial pressure of water is 26.7 mm Hg at 27°C.

Accepted Answer

The answer of A 0.500 g sample containing Ag₂O and...

Question 6

What is the average speed (actually the root-mean-square speed)of a neon atom at 27°C?

Accepted Answer

The root-mean-square speed of a gas molecule is given by the formula: v_rms = sqrt((3kT)/m), where k is the Boltzmann constant, T is the temperature in Kelvin, and m is the mass of a molecule. At 27°C (300K), the calculation for neon gives approximately 609 m/s.

Question 7

Each of three identical 15.0-L gas cylinders contains 7.50 mol of gas at 295 K.Cylinder A contains Ar,cylinder B contains Cl₂,and cylinder C contains N₂.According to the kinetic molecular theory,which gas has the highest average speed?

Accepted Answer

According to the kinetic molecular theory, the average speed of gas molecules is inversely proportional to the square root of their molar mass. N₂ has the lowest molar mass among the gases, so it has the highest average speed.

Question 8

What is the temperature of CO₂ gas if the average speed (actually the root-mean-square speed)of the molecules is 750 m/s?

Accepted Answer

The root-mean-square speed (v_rms) is given by the formula v_rms = sqrt(3kT/m), where k is the Boltzmann constant, T is the temperature, and m is the molar mass. Solving for T using the given v_rms of 750 m/s and the molar mass of CO2, we find that T is approximately 992 K.

Question 9

Each of three identical 15.0-L gas cylinders contains 7.50 mol of gas at 295 K.Cylinder A contains Ar,cylinder B contains Cl₂,and cylinder C contains N₂.According to the kinetic molecular theory,which gas has the highest pressure?

Accepted Answer

According to the ideal gas law, the pressure of a gas is directly proportional to the number of moles of gas and the temperature, and inversely proportional to the volume. Since the three cylinders have the same volume, temperature, and number of moles of gas, they will have identical pressures. Therefore, the correct choice is D, all have identical pressures.

Question 10

Some assumptions from the kinetic molecular theory are listed below.Which one is most frequently cited to explain diffusion of a gas?

Accepted Answer

The assumption that a gas consists of tiny particles moving in random straight line motion is most frequently cited to explain diffusion of a gas. This is because the random motion of gas particles leads to their spreading out and mixing with other gases, which is the process of diffusion.

Question 11

Each of three identical 15.0-L gas cylinders contains 7.50 mol of gas at 295 K.Cylinder A contains Ar,cylinder B contains Cl₂,and cylinder C contains N₂.According to the kinetic molecular theory,which gas has the highest collision frequency?

Accepted Answer

The answer of Each of three identical 15.0-L gas cylinders...

Question 12

At what temperature will sulfur hexafluoride molecules have the same average speed as argon atoms at 20°C?

Accepted Answer

The answer of At what temperature will sulfur hexafluoride molecules...

Question 13

Each of three identical 15.0-L gas cylinders contains 7.50 mol of gas at 295 K.Cylinder A contains Ar,cylinder B contains Cl₂,and cylinder C contains N₂.According to the kinetic molecular theory,which gas has the highest average kinetic energy?

Accepted Answer

According to the kinetic molecular theory, the average kinetic energy of a gas is directly proportional to its temperature and does not depend on the identity of the gas particles. Since all three cylinders are at the same temperature, they have the same average kinetic energy. Therefore, the answer is D.

Question 14

You are given two flasks of equal volume.One contains H₂ at 0°C and 1 atm while the other contains CO₂ at 0°C and 2 atm.Which of the following quantities will be the same for both flasks?

Accepted Answer

The average molecular kinetic energy of a gas depends only on the temperature, which is the same for both flasks (0°C).

Question 15

Some assumptions from the kinetic molecular theory are listed below.Which one is most frequently cited to explain Charles' law?

Accepted Answer

Charles' law relates the volume of a gas to its temperature, assuming constant pressure. The assumption that the average kinetic energy of gas particles is proportional to the Kelvin temperature is most frequently cited to explain this relationship. As the temperature increases, the gas particles have greater kinetic energy and move faster, causing them to collide more frequently and with greater force, resulting in an increase in volume.

Question 16

A process by which gas molecules escape through a tiny hole in a membrane into a vacuum without collisions is called

Accepted Answer

The process described is effusion, where gas molecules pass through a small opening into a vacuum without collisions with other molecules. Boyle's law relates the volume and pressure of a gas, diffusion refers to the movement of gas molecules from an area of high concentration to an area of low concentration, and sublimation is the conversion of a solid directly to a gas without passing through a liquid state.

Question 17

Which one of the following gases will have the highest rate of effusion?

Accepted Answer

According to Graham's law of effusion, the rate of effusion of a gas is inversely proportional to the square root of its molar mass. N₂O has the lowest molar mass among the given options, thus it will have the highest rate of effusion.

Question 18

Some assumptions from the kinetic molecular theory are listed below.Which one is most frequently cited to explain compressibility of a gas?

Accepted Answer

The assumption that the volume of gas particles is negligible compared to the volume of the gas is most frequently cited to explain the compressibility of a gas. This is because gas particles are able to be compressed due to the large amount of empty space between them, causing the volume of the gas to decrease.

Question 19

Which of the following gases has the lowest average speed at 25°C?

Accepted Answer

The average speed of a gas is inversely proportional to the square root of its molar mass. H₂S has the highest molar mass among the given gases, resulting in the lowest average speed at 25°C.

Question 20

Which of the following gases has the highest average speed at 400K?

Accepted Answer

The average speed of a gas is inversely proportional to the square root of its molar mass. CO₂ has the lowest molar mass among the given gases, so it has the highest average speed at 400K.

Quiz 9: Gases: Their Properties and Behavior

Each of three identical 15.0-L gas cylinders contains 7.50 mol of gas at 295 K.Cylinder A contains Ar,cylinder B contains Cl₂,and cylinder C contains N₂.According to the kinetic molecular theory,which gas has the highest density?

According to the kinetic molecular theory,the pressure of a gas in a container will decrease if the

The mixing of different gases by random molecular motion with frequent collisions is called

What is the average speed (actually the root-mean-square speed) of a neon atom at 27°C?

Each of three identical 15.0-L gas cylinders contains 7.50 mol of gas at 295 K.Cylinder A contains Ar,cylinder B contains Cl₂,and cylinder C contains N₂.According to the kinetic molecular theory,which gas has the highest average speed?

What is the temperature of CO₂ gas if the average speed (actually the root-mean-square speed) of the molecules is 750 m/s?

Each of three identical 15.0-L gas cylinders contains 7.50 mol of gas at 295 K.Cylinder A contains Ar,cylinder B contains Cl₂,and cylinder C contains N₂.According to the kinetic molecular theory,which gas has the highest pressure?

Some assumptions from the kinetic molecular theory are listed below.Which one is most frequently cited to explain diffusion of a gas?

Each of three identical 15.0-L gas cylinders contains 7.50 mol of gas at 295 K.Cylinder A contains Ar,cylinder B contains Cl₂,and cylinder C contains N₂.According to the kinetic molecular theory,which gas has the highest collision frequency?

At what temperature will sulfur hexafluoride molecules have the same average speed as argon atoms at 20°C?

Each of three identical 15.0-L gas cylinders contains 7.50 mol of gas at 295 K.Cylinder A contains Ar,cylinder B contains Cl₂,and cylinder C contains N₂.According to the kinetic molecular theory,which gas has the highest average kinetic energy?

You are given two flasks of equal volume.One contains H₂ at 0°C and 1 atm while the other contains CO₂ at 0°C and 2 atm.Which of the following quantities will be the same for both flasks?

Some assumptions from the kinetic molecular theory are listed below.Which one is most frequently cited to explain Charles' law?

A process by which gas molecules escape through a tiny hole in a membrane into a vacuum without collisions is called

Which one of the following gases will have the highest rate of effusion?

Some assumptions from the kinetic molecular theory are listed below.Which one is most frequently cited to explain compressibility of a gas?

Which of the following gases has the lowest average speed at 25°C?

Which of the following gases has the highest average speed at 400K?

Quiz 9: Gases: Their Properties and Behavior

Each of three identical 15.0-L gas cylinders contains 7.50 mol of gas at 295 K.Cylinder A contains Ar,cylinder B contains Cl2,and cylinder C contains N2.According to the kinetic molecular theory,which gas has the highest density?

According to the kinetic molecular theory,the pressure of a gas in a container will decrease if the

The mixing of different gases by random molecular motion with frequent collisions is called

What is the average speed (actually the root-mean-square speed) of a neon atom at 27°C?

Each of three identical 15.0-L gas cylinders contains 7.50 mol of gas at 295 K.Cylinder A contains Ar,cylinder B contains Cl2,and cylinder C contains N2.According to the kinetic molecular theory,which gas has the highest average speed?

What is the temperature of CO2 gas if the average speed (actually the root-mean-square speed) of the molecules is 750 m/s?

Each of three identical 15.0-L gas cylinders contains 7.50 mol of gas at 295 K.Cylinder A contains Ar,cylinder B contains Cl2,and cylinder C contains N2.According to the kinetic molecular theory,which gas has the highest pressure?

Some assumptions from the kinetic molecular theory are listed below.Which one is most frequently cited to explain diffusion of a gas?

Each of three identical 15.0-L gas cylinders contains 7.50 mol of gas at 295 K.Cylinder A contains Ar,cylinder B contains Cl2,and cylinder C contains N2.According to the kinetic molecular theory,which gas has the highest collision frequency?

At what temperature will sulfur hexafluoride molecules have the same average speed as argon atoms at 20°C?

Each of three identical 15.0-L gas cylinders contains 7.50 mol of gas at 295 K.Cylinder A contains Ar,cylinder B contains Cl2,and cylinder C contains N2.According to the kinetic molecular theory,which gas has the highest average kinetic energy?

You are given two flasks of equal volume.One contains H2 at 0°C and 1 atm while the other contains CO2 at 0°C and 2 atm.Which of the following quantities will be the same for both flasks?

Some assumptions from the kinetic molecular theory are listed below.Which one is most frequently cited to explain Charles' law?

A process by which gas molecules escape through a tiny hole in a membrane into a vacuum without collisions is called

Which one of the following gases will have the highest rate of effusion?

Some assumptions from the kinetic molecular theory are listed below.Which one is most frequently cited to explain compressibility of a gas?

Which of the following gases has the lowest average speed at 25°C?

Which of the following gases has the highest average speed at 400K?

Each of three identical 15.0-L gas cylinders contains 7.50 mol of gas at 295 K.Cylinder A contains Ar,cylinder B contains Cl₂,and cylinder C contains N₂.According to the kinetic molecular theory,which gas has the highest density?

Each of three identical 15.0-L gas cylinders contains 7.50 mol of gas at 295 K.Cylinder A contains Ar,cylinder B contains Cl₂,and cylinder C contains N₂.According to the kinetic molecular theory,which gas has the highest average speed?

What is the temperature of CO₂ gas if the average speed (actually the root-mean-square speed) of the molecules is 750 m/s?

Each of three identical 15.0-L gas cylinders contains 7.50 mol of gas at 295 K.Cylinder A contains Ar,cylinder B contains Cl₂,and cylinder C contains N₂.According to the kinetic molecular theory,which gas has the highest pressure?

Each of three identical 15.0-L gas cylinders contains 7.50 mol of gas at 295 K.Cylinder A contains Ar,cylinder B contains Cl₂,and cylinder C contains N₂.According to the kinetic molecular theory,which gas has the highest collision frequency?

Each of three identical 15.0-L gas cylinders contains 7.50 mol of gas at 295 K.Cylinder A contains Ar,cylinder B contains Cl₂,and cylinder C contains N₂.According to the kinetic molecular theory,which gas has the highest average kinetic energy?

You are given two flasks of equal volume.One contains H₂ at 0°C and 1 atm while the other contains CO₂ at 0°C and 2 atm.Which of the following quantities will be the same for both flasks?