Question 1

Use stoichiometry to solve problems involving gas-phase chemical reactions.

Accepted Answer

Stoichiometry is the quantitative relati

Question 2

Increasing the number of molecules in a container increases the pressure because

Accepted Answer

A)  there are more atoms in the container. 
B)  there are more collisions with the wall of the container. 
C)  the distance to the walls is closer for more molecules. 
D)  the temperature increases in the container. 
E)  there are more collisions molecules move faster. 
A)  there are more atoms in the container. 
B)  there are more collisions with the wall of the container. 
C)  the distance to the walls is closer for more molecules. 
D)  the temperature increases in the container. 
E)  there are more collisions molecules move faster.

Question 3

A reaction is carried out under an atmosphere of oxygen. As the reaction proceeds, oxygen is consumed. The reaction started in a 500 ml flask, under a pressure of 1015 mm Hg, and a temperature of $22^\degree$C. How many moles of oxygen had been consumed if at the end of the reaction the pressure was 790 mm Hg and the temperature did not change?

Accepted Answer

A)  0.0286 moles 
B)  46.6 moles 
C)  0.0223 moles 
D)  0.0250 moles 
E)  0.00610 moles 
A)  0.0286 moles 
B)  46.6 moles 
C)  0.0223 moles 
D)  0.0250 moles 
E)  0.00610 moles

Question 4

Athletes are reminded to drink more water when they are exercising in cold weather because it is easy to get dehydrated. The main reason for this is

Accepted Answer

A)  the increased dew point at lower temperatures. 
B)  the higher vapour pressure of water at lower temperatures. 
C)  the lower relative humidity of the air at lower temperatures. 
D)  higher relative humidity. 
E)  lower vapour pressure. 
A)  the increased dew point at lower temperatures. 
B)  the higher vapour pressure of water at lower temperatures. 
C)  the lower relative humidity of the air at lower temperatures. 
D)  higher relative humidity. 
E)  lower vapour pressure.

Question 5

Explain the basic concepts of kinetic molecular theory: molecular speed, energy, and the effects of temperature and volume on gas pressure.

Accepted Answer

At a given temperature, all gases have t

Question 6

A gas mixture containing oxygen, nitrogen, and helium exerts a total pressure of 925 Torr. If the partial pressures are oxygen 425 Torr, and helium 75 Torr, what is the partial pressure (in bar) of nitrogen in the mixture?

Accepted Answer

The answer of A gas mixture containing oxygen, nitrogen, and...

Question 7

Carbon monoxide is used frequently in the production of metals and steel. A cylinder of CO is shipped to a research facility with a pressure of 170. atm and a volume of 90.0 litres. How many kilograms of CO are needed to fill the cylinder at 10.0˚C?

Accepted Answer

The answer of Carbon monoxide is used frequently in the...

Question 8

A 1.56 L sample of nitrogen gas (1.21 x 10-2g) is heated from 24°C to 350°C. Calculate the densities of the nitrogen at the different temperatures.

Accepted Answer

7.74 x 10^-3

Question 9

Which of the following molecules/atoms will exert a greater force when it strikes the wall of the container under ideal conditions?

Accepted Answer

A)  Cs atoms at 1000 K 
B)  Naphthalene molecules (C10H8) at 1400 K 
C)  Radon atoms at 880 K 
D)  He atoms at 1500 K 
E)  He atoms at 1000 K 
A)  Cs atoms at 1000 K 
B)  Naphthalene molecules (C10H8) at 1400 K 
C)  Radon atoms at 880 K 
D)  He atoms at 1500 K 
E)  He atoms at 1000 K

Question 10

A 400 L steel tank is filled with a mixture of 20 kg of methane (CH4), 5 kg of ethane (C2H6) and 0.050 g of butanethiol (C4H10S). (This last sulphur-containing compound has an intense smell to indicate any leaks of this flammable mixture). What is the total pressure in the tank and the partial pressure of each component if the temperature is 24 °C?

Accepted Answer

Question 11

Methanol, CH3OH, is produced by the reaction of methane with oxygen under carefully controlled conditions:
2 CH4 (g) + O2 (g) $\rightarrow$ 2 CH3OH (g)
A 200 L reactor is filled with a mixture of methane to a pressure of 10.5 atm and 3.50 atm oxygen at 298 K. The reactor is then heated to 350°C.(a) What is the mass of methanol formed if the reaction proceeds to 100% yield?(b) What are the partial pressures of each of the substances and the total pressure in the reactor at the end of the reaction if the temperature is 350°C?

Accepted Answer

The answer of Methanol, CH3OH, is produced by the reaction...

Question 12

An ozone measurement in a ultraviolet paint curing facility is 12.2 PPM. The air pressure is 752.1 mm Hg. What is the partial pressure of ozone in the facility?

Accepted Answer

A)  12.2 x 10-2 mm Hg 
B)  12.2 x 10-6 atm 
C)  9.2 x 10-3 mm Hg 
D)  9.2 x 10-6 atm 
E)  92 mm Hg 
A)  12.2 x 10-2 mm Hg 
B)  12.2 x 10-6 atm 
C)  9.2 x 10-3 mm Hg 
D)  9.2 x 10-6 atm 
E)  92 mm Hg

Question 13

Calculate gas densities and molar masses from pressure-volume-temperature data.

Accepted Answer

To calculate gas densities and molar mas

Question 14

A tank holds a mixture of oxygen and nitrogen gases. If the partial pressure of oxygen is 3.3 atm and the mole fraction of N2 gas X(N2) = 0.78, what are the total pressure in the tank and the partial pressure of N2?

Accepted Answer

A)  15 atm, 11.7 atm 
B)  5.9 atm, 2.6 atm 
C)  7.5 atm, 4.2 atm 
D)  1 atm, 0.78 atm 
E)  4.1 atm, 0.78 atm 
A)  15 atm, 11.7 atm 
B)  5.9 atm, 2.6 atm 
C)  7.5 atm, 4.2 atm 
D)  1 atm, 0.78 atm 
E)  4.1 atm, 0.78 atm

Question 15

Relate pressure, volume, temperature, and amount of gas.

Accepted Answer

Solving quantitative problems

Question 16

A sample of radon is expected to diffuse ______ than oxygen gas.

Accepted Answer

A)  2.6 times faster 
B)  2.6 times slower 
C)  6.9 times faster 
D)  6.9 times slower 
A)  2.6 times faster 
B)  2.6 times slower 
C)  6.9 times faster 
D)  6.9 times slower

Question 17

On the graph provided draw the speed distribution of O2 at 250K, O2 at 350 K, and H2 at 250K.

Accepted Answer

Question 18

Acetic acid, shown below, is the substance responsible for the odour of vinegar.   What is the average velocity and average kinetic energy (kJ/mol) of acetic acid molecules?

Accepted Answer

3.7 x10³ kJ

Question 19

A tank holds a mixture of argon and helium gases. If the partial pressure of oxygen is 3.3 atm and the total pressure of the mixture is 15 atm; what is the mole fraction of helium gas?

Accepted Answer

A)  0.78 
B)  0.18 
C)  0.28 
D)  0.64 
E)  0.81 
A)  0.78 
B)  0.18 
C)  0.28 
D)  0.64 
E)  0.81

Question 20

If a 0.18 g sample of aluminum metal is dropped into 400 mL of 6 M HCl, hydrogen gas is evolved. The hydrogen evolved is collected over water, so the gas collected is a mixture of water vapour (vapour pressure = 23.8 mm Hg) and hydrogen gas. If the external pressure is 1.02 atm and temperature is 25?C, what will be the total volume of gas collected in L?

Accepted Answer

A)  6.7 x 10-3 L 
B)  0.010 L 
C)  0.22 L 
D)  0.25 L 
E)  0.99 L 
A)  6.7 x 10-3 L 
B)  0.010 L 
C)  0.22 L 
D)  0.25 L 
E)  0.99 L

Use stoichiometry to solve problems involving gas-phase chemical reactions.

Increasing the number of molecules in a container increases the pressure because

Athletes are reminded to drink more water when they are exercising in cold weather because it is easy to get dehydrated. The main reason for this is

Explain the basic concepts of kinetic molecular theory: molecular speed, energy, and the effects of temperature and volume on gas pressure.

A gas mixture containing oxygen, nitrogen, and helium exerts a total pressure of 925 Torr. If the partial pressures are oxygen 425 Torr, and helium 75 Torr, what is the partial pressure (in bar) of nitrogen in the mixture?

Carbon monoxide is used frequently in the production of metals and steel. A cylinder of CO is shipped to a research facility with a pressure of 170. atm and a volume of 90.0 litres. How many kilograms of CO are needed to fill the cylinder at 10.0˚C?

A 1.56 L sample of nitrogen gas (1.21 x 10^-2g) is heated from 24°C to 350°C. Calculate the densities of the nitrogen at the different temperatures.

Which of the following molecules/atoms will exert a greater force when it strikes the wall of the container under ideal conditions?

An ozone measurement in a ultraviolet paint curing facility is 12.2 PPM. The air pressure is 752.1 mm Hg. What is the partial pressure of ozone in the facility?

Calculate gas densities and molar masses from pressure-volume-temperature data.

A tank holds a mixture of oxygen and nitrogen gases. If the partial pressure of oxygen is 3.3 atm and the mole fraction of N₂ gas X(N₂) = 0.78, what are the total pressure in the tank and the partial pressure of N₂?

Relate pressure, volume, temperature, and amount of gas.

A sample of radon is expected to diffuse ______ than oxygen gas.

On the graph provided draw the speed distribution of O₂ at 250K, O₂ at 350 K, and H₂ at 250K.

Acetic acid, shown below, is the substance responsible for the odour of vinegar. What is the average velocity and average kinetic energy (kJ/mol) of acetic acid molecules?

A tank holds a mixture of argon and helium gases. If the partial pressure of oxygen is 3.3 atm and the total pressure of the mixture is 15 atm; what is the mole fraction of helium gas?

Fundamental Concepts of Chemistry

Energy and Its Conservation

Atoms and Light

Atomic Energies and Periodicity

Fundamentals of Chemical Bonding

Theories of Chemical Bonding

Effects of Intermolecular Forces

Properties of Solutions

Organic Chemistrystructure

Organic Chemistryreactions

Spontaneity of Chemical Processes

Kinetics: Mechanisms and Rates of Reactions

Principles of Chemical Equilibrium

Aqueous Acidbase Equilibria

Applications of Aqueous Equilibria

Electron Transfer Reactions

Macromolecules

The Transition Metals

The Main Group Elements

Nuclear Chemistry and Radiochemistry

Filters

Exam 2: The Behaviour of Gases

Use stoichiometry to solve problems involving gas-phase chemical reactions.

Increasing the number of molecules in a container increases the pressure because

Athletes are reminded to drink more water when they are exercising in cold weather because it is easy to get dehydrated. The main reason for this is

Explain the basic concepts of kinetic molecular theory: molecular speed, energy, and the effects of temperature and volume on gas pressure.

A gas mixture containing oxygen, nitrogen, and helium exerts a total pressure of 925 Torr. If the partial pressures are oxygen 425 Torr, and helium 75 Torr, what is the partial pressure (in bar) of nitrogen in the mixture?

Carbon monoxide is used frequently in the production of metals and steel. A cylinder of CO is shipped to a research facility with a pressure of 170. atm and a volume of 90.0 litres. How many kilograms of CO are needed to fill the cylinder at 10.0˚C?

A 1.56 L sample of nitrogen gas (1.21 x 10-2g) is heated from 24°C to 350°C. Calculate the densities of the nitrogen at the different temperatures.

Which of the following molecules/atoms will exert a greater force when it strikes the wall of the container under ideal conditions?

An ozone measurement in a ultraviolet paint curing facility is 12.2 PPM. The air pressure is 752.1 mm Hg. What is the partial pressure of ozone in the facility?

Calculate gas densities and molar masses from pressure-volume-temperature data.

A tank holds a mixture of oxygen and nitrogen gases. If the partial pressure of oxygen is 3.3 atm and the mole fraction of N2 gas X(N2) = 0.78, what are the total pressure in the tank and the partial pressure of N2?

Relate pressure, volume, temperature, and amount of gas.

A sample of radon is expected to diffuse ______ than oxygen gas.

On the graph provided draw the speed distribution of O2 at 250K, O2 at 350 K, and H2 at 250K.

Acetic acid, shown below, is the substance responsible for the odour of vinegar. What is the average velocity and average kinetic energy (kJ/mol) of acetic acid molecules?

A tank holds a mixture of argon and helium gases. If the partial pressure of oxygen is 3.3 atm and the total pressure of the mixture is 15 atm; what is the mole fraction of helium gas?

Fundamental Concepts of Chemistry

Energy and Its Conservation

Atoms and Light

Atomic Energies and Periodicity

Fundamentals of Chemical Bonding

Theories of Chemical Bonding

Effects of Intermolecular Forces

Properties of Solutions

Organic Chemistrystructure

Organic Chemistryreactions

Spontaneity of Chemical Processes

Kinetics: Mechanisms and Rates of Reactions

Principles of Chemical Equilibrium

Aqueous Acidbase Equilibria

Applications of Aqueous Equilibria

Electron Transfer Reactions

Macromolecules

The Transition Metals

The Main Group Elements

Nuclear Chemistry and Radiochemistry

Filters

A 1.56 L sample of nitrogen gas (1.21 x 10^-2g) is heated from 24°C to 350°C. Calculate the densities of the nitrogen at the different temperatures.

A tank holds a mixture of oxygen and nitrogen gases. If the partial pressure of oxygen is 3.3 atm and the mole fraction of N₂ gas X(N₂) = 0.78, what are the total pressure in the tank and the partial pressure of N₂?

On the graph provided draw the speed distribution of O₂ at 250K, O₂ at 350 K, and H₂ at 250K.