Question 1

In which of the following statements is the gas variable (in italics)correctly described?

Accepted Answer

A)  Temperature is a measure of the space occupied by a gas. 
B)  Volume increases as the collisions of gas particles with the walls of the container increases. 
C)  Temperature is related to the average speed of gas particles. 
D)  The number of moles of a gas decreases as the volume of the gas increases. 
E)  When gas particles move faster, the pressure of the gas must increase. 
A)  Temperature is a measure of the space occupied by a gas. 
B)  Volume increases as the collisions of gas particles with the walls of the container increases. 
C)  Temperature is related to the average speed of gas particles. 
D)  The number of moles of a gas decreases as the volume of the gas increases. 
E)  When gas particles move faster, the pressure of the gas must increase.

Question 2

Henry's law is   .Which statement BEST describes the meaning of this law?

Accepted Answer

A)  As the pressure above a gas in solution decreases, the concentration of gas in solution increases. 
B)  As the pressure above a gas in solution increases, the concentration of gas in solution also increases. 
C)  As the pressure above a gas in solution increases, the concentration of gas in solution decreases. 
D)  As the concentration of a gas in solution increases, Henry's constant increases. 
E)  As the concentration of a gas in solution decreases, Henry's constant decreases. 
A)  As the pressure above a gas in solution decreases, the concentration of gas in solution increases. 
B)  As the pressure above a gas in solution increases, the concentration of gas in solution also increases. 
C)  As the pressure above a gas in solution increases, the concentration of gas in solution decreases. 
D)  As the concentration of a gas in solution increases, Henry's constant increases. 
E)  As the concentration of a gas in solution decreases, Henry's constant decreases.

Question 3

Which of the following processes is an endothermic physical change?

Accepted Answer

A)  freezing water in the freezer 
B)  water condensing on the outside of a glass 
C)  boiling water to make steam 
D)  the deposition of a cloud to make snow 
E)  All of the above are an endothermic physical change. 
A)  freezing water in the freezer 
B)  water condensing on the outside of a glass 
C)  boiling water to make steam 
D)  the deposition of a cloud to make snow 
E)  All of the above are an endothermic physical change.

Question 4

How are vaporization and evaporation similar?

Accepted Answer

A)  Vaporization and evaporation mean exactly the same thing. 
B)  Both occur only at high temperatures. 
C)  Both occur only at very low temperatures. 
D)  Both always involve water. 
E)  Both are the transformation of liquid into a gas. 
A)  Vaporization and evaporation mean exactly the same thing. 
B)  Both occur only at high temperatures. 
C)  Both occur only at very low temperatures. 
D)  Both always involve water. 
E)  Both are the transformation of liquid into a gas.

Question 5

Air is primarily composed of nitrogen (594 torr)and oxygen (160 torr).There is also carbon dioxide and water vapor in the air.Assuming that atmospheric pressure is 760 torr, what is the partial pressure of carbon dioxide and water vapor combined?

Accepted Answer

A)  1514 torr 
B)  754 torr 
C)  500 torr 
D)  166 torr 
E)  6 torr 
A)  1514 torr 
B)  754 torr 
C)  500 torr 
D)  166 torr 
E)  6 torr

Question 6

One of the symptoms of the bends is joint pain.Why does joint pain occur with the bends?

Accepted Answer

A)  Nitrogen bubbles expand in the joints as pressure decreases. 
B)  The bends causes muscle spasms, which leads to joint pain. 
C)  The bends causes a loss of cartilage in joints. 
D)  Lactic acid is released as a stress response. 
E)  The reason for joint pain is unknown. 
A)  Nitrogen bubbles expand in the joints as pressure decreases. 
B)  The bends causes muscle spasms, which leads to joint pain. 
C)  The bends causes a loss of cartilage in joints. 
D)  Lactic acid is released as a stress response. 
E)  The reason for joint pain is unknown.

Question 7

Which statement BEST describes how heat energy is involved in changing water into steam?

Accepted Answer

A)  Heat energy breaks the intermolecular forces holding molecules of water together. 
B)  Heat energy is released from intermolecular forces as the molecules of water break apart. 
C)  Heat energy breaks the covalent bonds holding molecules of water together. 
D)  Heat energy is released from covalent bonds as the molecules of water break apart. 
E)  Heat energy is not involved in this change. 
A)  Heat energy breaks the intermolecular forces holding molecules of water together. 
B)  Heat energy is released from intermolecular forces as the molecules of water break apart. 
C)  Heat energy breaks the covalent bonds holding molecules of water together. 
D)  Heat energy is released from covalent bonds as the molecules of water break apart. 
E)  Heat energy is not involved in this change.

Question 8

Water has a specific heat of 1.00 cal/g·°C, and wood has a specific heat of 0.10 cal/g·°C.Which substance requires more heat to be warmed from room temperature to 50 °C?

Accepted Answer

A)  They both require the same amount of heat. 
B)  Water requires more heat because it has a higher specific heat. 
C)  Wood requires more heat because it has a lower specific heat. 
D)  Water requires more heat because it is a liquid at room temperature. 
E)  Wood requires more heat because it is a solid at room temperature. 
A)  They both require the same amount of heat. 
B)  Water requires more heat because it has a higher specific heat. 
C)  Wood requires more heat because it has a lower specific heat. 
D)  Water requires more heat because it is a liquid at room temperature. 
E)  Wood requires more heat because it is a solid at room temperature.

Question 9

This diagram shows balloons of various sizes filled with helium gas.Balloon A is at STP.If you heat balloon A, which balloon would you predict would BEST represent the new size of balloon A?

Accepted Answer

A)  balloon B 
B)  balloon C 
C)  balloon D 
D)  either balloon B or D 
E)  either balloon C or D 
A)  balloon B 
B)  balloon C 
C)  balloon D 
D)  either balloon B or D 
E)  either balloon C or D

Question 10

Three boxes, each containing molecules in the gas phase, are illustrated below.Which box would you expect to have the highest pressure?

Accepted Answer

A)  box A 
B)  box B 
C)  box C 
D)  boxes A and B have the same highest pressure. 
E)  boxes A and C have the same highest pressure. 
A)  box A 
B)  box B 
C)  box C 
D)  boxes A and B have the same highest pressure. 
E)  boxes A and C have the same highest pressure.

Question 11

The total pressure in a mixture of gases is equal to the partial pressure(s)of

Accepted Answer

A)  the gas present in the greatest quantity. 
B)  all of the gases added together. 
C)  the gas with the lowest boiling point. 
D)  the gas with the highest molar mass. 
E)  the gas with the greatest partial pressure. 
A)  the gas present in the greatest quantity. 
B)  all of the gases added together. 
C)  the gas with the lowest boiling point. 
D)  the gas with the highest molar mass. 
E)  the gas with the greatest partial pressure.

Question 12

What is the electron geometry of the carbon indicated by the arrow in this molecule of acetone?

Accepted Answer

A)  linear 
B)  bent 
C)  trigonal planar 
D)  trigonal pyramidal 
E)  tetrahedral 
A)  linear 
B)  bent 
C)  trigonal planar 
D)  trigonal pyramidal 
E)  tetrahedral

Question 13

Why must a scuba diver ascend slowly from a dive?

Accepted Answer

A)  to conserve air 
B)  to avoid the formation of nitrogen bubbles in the bloodstream 
C)  to avoid breathlessness 
D)  to change air tanks and check equipment 
E)  There is no reason; it is just common practice. 
A)  to conserve air 
B)  to avoid the formation of nitrogen bubbles in the bloodstream 
C)  to avoid breathlessness 
D)  to change air tanks and check equipment 
E)  There is no reason; it is just common practice.

Question 14

Which of the following physical changes is the result of a decrease in temperature?

Accepted Answer

A)  vaporization 
B)  sublimation 
C)  melting 
D)  freezing 
E)  All of the above are a result of a decrease in temperature. 
A)  vaporization 
B)  sublimation 
C)  melting 
D)  freezing 
E)  All of the above are a result of a decrease in temperature.

Question 15

You drive your car from Salt Lake City to the mountains to go skiing.It is a nice day in Salt Lake, with a temperature of 16 °C and an atmospheric pressure of 0.85 atm.In the mountains, it is freezing at -1.0 °C and an atmospheric pressure of 0.70 atm.If the volume of air in your tires is 12 L when you leave the city, what is it in the mountains?

Accepted Answer

A)  -0.91 L 
B)  9.3 L 
C)  11 L 
D)  13 L 
E)  14 L 
A)  -0.91 L 
B)  9.3 L 
C)  11 L 
D)  13 L 
E)  14 L

Question 16

What is the strongest intermolecular force that exists between molecules of acetone in the liquid or solid state?

Accepted Answer

A)  dispersion forces 
B)  dipole-dipole forces 
C)  hydrogen bonds 
D)  ionic interactions 
E)  None of the above forces is correct. 
A)  dispersion forces 
B)  dipole-dipole forces 
C)  hydrogen bonds 
D)  ionic interactions 
E)  None of the above forces is correct.

Question 17

Which process requires more energy per gram: melting ice or boiling water?

Accepted Answer

A)  They both require the same amount of energy because both processes involve breaking intermolecular forces. 
B)  Melting ice takes more energy because more intermolecular forces are broken. 
C)  Boiling water takes more energy because more intermolecular forces are broken. 
D)  Melting ice takes more energy because it occurs at 0 °C instead of 100 °C. 
E)  The energy of these processes has never been compared. 
A)  They both require the same amount of energy because both processes involve breaking intermolecular forces. 
B)  Melting ice takes more energy because more intermolecular forces are broken. 
C)  Boiling water takes more energy because more intermolecular forces are broken. 
D)  Melting ice takes more energy because it occurs at 0 °C instead of 100 °C. 
E)  The energy of these processes has never been compared.

Question 18

What happens to the speed of molecules when the molecules are frozen?

Accepted Answer

A)  The speed stays the same. 
B)  The molecules speed up. 
C)  The molecules slow down. 
D)  The speed does not change in a predictable way. 
E)  The molecules stop moving completely. 
A)  The speed stays the same. 
B)  The molecules speed up. 
C)  The molecules slow down. 
D)  The speed does not change in a predictable way. 
E)  The molecules stop moving completely.

Question 19

What type of change in pressure causes the bends, and why?

Accepted Answer

A)  an increase in pressure, because nitrogen rapidly diffuses out of the bloodstream 
B)  an increase in pressure, because nitrogen rapidly dissolves into the bloodstream 
C)  a decrease in pressure, because nitrogen rapidly diffuses out of the bloodstream 
D)  a decrease in pressure, because nitrogen slowly dissolves into the bloodstream 
E)  The bends is not a result of pressure changes. 
A)  an increase in pressure, because nitrogen rapidly diffuses out of the bloodstream 
B)  an increase in pressure, because nitrogen rapidly dissolves into the bloodstream 
C)  a decrease in pressure, because nitrogen rapidly diffuses out of the bloodstream 
D)  a decrease in pressure, because nitrogen slowly dissolves into the bloodstream 
E)  The bends is not a result of pressure changes.

In which of the following statements is the gas variable (in italics)correctly described?

Henry's law is .Which statement BEST describes the meaning of this law?

Which of the following processes is an endothermic physical change?

How are vaporization and evaporation similar?

Air is primarily composed of nitrogen (594 torr)and oxygen (160 torr).There is also carbon dioxide and water vapor in the air.Assuming that atmospheric pressure is 760 torr, what is the partial pressure of carbon dioxide and water vapor combined?

One of the symptoms of the bends is joint pain.Why does joint pain occur with the bends?

Which statement BEST describes how heat energy is involved in changing water into steam?

Water has a specific heat of 1.00 cal/g·°C, and wood has a specific heat of 0.10 cal/g·°C.Which substance requires more heat to be warmed from room temperature to 50 °C?

This diagram shows balloons of various sizes filled with helium gas.Balloon A is at STP.If you heat balloon A, which balloon would you predict would BEST represent the new size of balloon A?

Three boxes, each containing molecules in the gas phase, are illustrated below.Which box would you expect to have the highest pressure?

The total pressure in a mixture of gases is equal to the partial pressure(s)of

What is the electron geometry of the carbon indicated by the arrow in this molecule of acetone?

Why must a scuba diver ascend slowly from a dive?

Which of the following physical changes is the result of a decrease in temperature?

What is the strongest intermolecular force that exists between molecules of acetone in the liquid or solid state?

Which process requires more energy per gram: melting ice or boiling water?

What happens to the speed of molecules when the molecules are frozen?

What type of change in pressure causes the bends, and why?

Matter, Energy, and Measurement

Atomic Structure and Radioisotopes

Ionic and Covalent Compounds

Molecular Geometry, Polarity, and Intermolecular

Chemical Quantities and Introduction to Reactions

Chemical Reactions: Energy, Rates, and Equilibrium

Mixtures, Solution Concentrations, and Diffusion

Acids and Bases, Ph, and Buffers

Introduction to Organic Chemistry:

Alcohols, Phenols, Thiols, Ethers, and Amines

The Carbonyl Containing Functional Groups

The Common Organic Reactions in Biochemistry

Carbohydrates: Structure and Function

Lipids: Structure and Function

Proteins: Structure and Function

Nucleotides and Nucleic Acids

Energy and Metabolism

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Exam 7: Changes of State and Gas Laws

In which of the following statements is the gas variable (in italics)correctly described?

Henry's law is .Which statement BEST describes the meaning of this law?

Which of the following processes is an endothermic physical change?

How are vaporization and evaporation similar?

Air is primarily composed of nitrogen (594 torr)and oxygen (160 torr).There is also carbon dioxide and water vapor in the air.Assuming that atmospheric pressure is 760 torr, what is the partial pressure of carbon dioxide and water vapor combined?

One of the symptoms of the bends is joint pain.Why does joint pain occur with the bends?

Which statement BEST describes how heat energy is involved in changing water into steam?

Water has a specific heat of 1.00 cal/g·°C, and wood has a specific heat of 0.10 cal/g·°C.Which substance requires more heat to be warmed from room temperature to 50 °C?

This diagram shows balloons of various sizes filled with helium gas.Balloon A is at STP.If you heat balloon A, which balloon would you predict would BEST represent the new size of balloon A?

Three boxes, each containing molecules in the gas phase, are illustrated below.Which box would you expect to have the highest pressure?

The total pressure in a mixture of gases is equal to the partial pressure(s)of

What is the electron geometry of the carbon indicated by the arrow in this molecule of acetone?

Why must a scuba diver ascend slowly from a dive?

Which of the following physical changes is the result of a decrease in temperature?

What is the strongest intermolecular force that exists between molecules of acetone in the liquid or solid state?

Which process requires more energy per gram: melting ice or boiling water?

What happens to the speed of molecules when the molecules are frozen?

What type of change in pressure causes the bends, and why?

Matter, Energy, and Measurement

Atomic Structure and Radioisotopes

Ionic and Covalent Compounds

Molecular Geometry, Polarity, and Intermolecular

Chemical Quantities and Introduction to Reactions

Chemical Reactions: Energy, Rates, and Equilibrium

Mixtures, Solution Concentrations, and Diffusion

Acids and Bases, Ph, and Buffers

Introduction to Organic Chemistry:

Alcohols, Phenols, Thiols, Ethers, and Amines

The Carbonyl Containing Functional Groups

The Common Organic Reactions in Biochemistry

Carbohydrates: Structure and Function

Lipids: Structure and Function

Proteins: Structure and Function

Nucleotides and Nucleic Acids

Energy and Metabolism

Filters