Question 1

Which of the molecules in this table is the most volatile?

Accepted Answer

A)  acetone 
B)  methanol 
C)  formic acid 
D)  chloroform 
E)  pentane 
A)  acetone 
B)  methanol 
C)  formic acid 
D)  chloroform 
E)  pentane

Question 2

Why is water (H2O) a liquid at room temperature while methane (CH4) is a gas?

Accepted Answer

A)  Water forms hydrogen bonds and methane only forms dispersion forces. 
B)  Water forms dispersion forces and methane forms hydrogen bonds. 
C)  Water has a higher molecular weight than methane. 
D)  Methane has a higher molecular weight than water. 
E)  Methane has more atoms than water. 
A)  Water forms hydrogen bonds and methane only forms dispersion forces. 
B)  Water forms dispersion forces and methane forms hydrogen bonds. 
C)  Water has a higher molecular weight than methane. 
D)  Methane has a higher molecular weight than water. 
E)  Methane has more atoms than water.

Question 3

Which atom has the highest electronegativity in this molecule of acetone?

Accepted Answer

A)  carbon 
B)  oxygen 
C)  hydrogen 
D)  carbon and hydrogen 
E)  They all have the same electronegativity. 
A)  carbon 
B)  oxygen 
C)  hydrogen 
D)  carbon and hydrogen 
E)  They all have the same electronegativity.

Question 4

How does the pressure of a gas change when it is heated in a sealed container with a constant volume (note: it is not a good idea to do this without special equipment)?

Accepted Answer

A)  It will not change because there is no relationship between temperature and pressure. 
B)  It will increase because P1T1=P2T2. 
C)  It will decrease because P1T1=P2T2. 
D)  It will increase because P1/T1 = P2/T2. 
E)  It will decrease because P1/T1 = P2/T2. 
A)  It will not change because there is no relationship between temperature and pressure. 
B)  It will increase because P1T1=P2T2. 
C)  It will decrease because P1T1=P2T2. 
D)  It will increase because P1/T1 = P2/T2. 
E)  It will decrease because P1/T1 = P2/T2.

Question 5

Arrow B points to

Accepted Answer

A)  a polar covalent bond. 
B)  a nonpolar bond. 
C)  a dispersion force. 
D)  heat. 
E)  a hydrogen bond. 
A)  a polar covalent bond. 
B)  a nonpolar bond. 
C)  a dispersion force. 
D)  heat. 
E)  a hydrogen bond.

Question 6

Two sealed boxes are filled with gas. The first box contains more molecules moving faster and therefore a higher pressure. The second box contains fewer molecules moving slower and therefore a lower pressure. Why does the first box have a higher pressure?

Accepted Answer

A)  The more molecules, the higher the pressure. 
B)  The more collisions against the side of the box, the higher the pressure. 
C)  The fewer molecules, the higher the pressure. 
D)  When there is high pressure, it is harder for molecules to move, so theycreate heat and pressure. 
E)  There is no reason for the first box to have high pressure. 
A)  The more molecules, the higher the pressure. 
B)  The more collisions against the side of the box, the higher the pressure. 
C)  The fewer molecules, the higher the pressure. 
D)  When there is high pressure, it is harder for molecules to move, so theycreate heat and pressure. 
E)  There is no reason for the first box to have high pressure.

Question 7

Which statement best describes how the kinetic molecular view of gases can be used to explain the effect of gas temperature on gas pressure?

Accepted Answer

A)  Gas pressure and gas temperature are unrelated. 
B)  The effect of temperature on pressure depends upon the gas. 
C)  As temperature increases, the particles are damaged, slowing them down and decreasing the number of collisions against the beaker; therefore the pressure decreases. 
D)  As temperature increases, the particles are split apart so that there are more collisions against the beaker and the pressure increases. 
E)  As temperature increases, the speed of particles increases, so there are more collisions against the beaker and the pressure increases. 
A)  Gas pressure and gas temperature are unrelated. 
B)  The effect of temperature on pressure depends upon the gas. 
C)  As temperature increases, the particles are damaged, slowing them down and decreasing the number of collisions against the beaker; therefore the pressure decreases. 
D)  As temperature increases, the particles are split apart so that there are more collisions against the beaker and the pressure increases. 
E)  As temperature increases, the speed of particles increases, so there are more collisions against the beaker and the pressure increases.

Question 8

The temperature of a gas at 1.00 atm and 8.00F1F1F1S1F1F1F10C is increased to 20.0F1F1F1S1F1F1F10C, resulting in a change of pressure. What is the new pressure?

Accepted Answer

A)  0.400 atm. 
B)  0.967 atm. 
C)  1.00 atm. 
D)  1.04 atm. 
E)  2.50 atm. 
A)  0.400 atm. 
B)  0.967 atm. 
C)  1.00 atm. 
D)  1.04 atm. 
E)  2.50 atm.

Question 9

A scuba diver dives down to 15 m, where the pressure is 2.5 atm. The scuba diver then inhales 500. mL of air and holds his breath while ascending to the water surface, where the pressure is 1 atm. What is the volume of the air in the diver's lungs at the surface? Assume that T and n are constant.

Accepted Answer

A)  0.0050 mL 
B)  0.20 mL 
C)  5.0 mL 
D)  200 mL 
E)  1250 mL 
A)  0.0050 mL 
B)  0.20 mL 
C)  5.0 mL 
D)  200 mL 
E)  1250 mL

Question 10

Which of the following statements best describes why a higher concentration of carbon dioxide is present in exhaled breath compared to inhaled breath?

Accepted Answer

A)  Actually, a higher concentration of carbon dioxide is present in inhaled breath. 
B)  Once the oxygen is used up in an inhalation, a larger percentage is carbon dioxide. 
C)  The oxygen in inhaled air reacts in the lungs to make carbon dioxide. 
D)  The concentration of carbon dioxide in the tissue is lower than that in exhaled air. 
E)  Carbon dioxide is produced during cellular respiration and then carried by the blood to the lungs to be exhaled. 
A)  Actually, a higher concentration of carbon dioxide is present in inhaled breath. 
B)  Once the oxygen is used up in an inhalation, a larger percentage is carbon dioxide. 
C)  The oxygen in inhaled air reacts in the lungs to make carbon dioxide. 
D)  The concentration of carbon dioxide in the tissue is lower than that in exhaled air. 
E)  Carbon dioxide is produced during cellular respiration and then carried by the blood to the lungs to be exhaled.

Question 11

You have a balloon containing 1.4 L of gas in it at standard temperature and pressure. Which conversion factor would you use to convert this number to moles?

Accepted Answer

A)  1 mole/22.4 L 
B)  1 L/22.4 mole 
C)  22.4 L/1 mole 
D)  6.02 x 1023 L/1 mole 
E)  1 L/6.02 x 1023 mole 
A)  1 mole/22.4 L 
B)  1 L/22.4 mole 
C)  22.4 L/1 mole 
D)  6.02 x 1023 L/1 mole 
E)  1 L/6.02 x 1023 mole

Question 12

Atmospheric pressure at sea level is ________. At elevations higher than sea level, atmospheric pressure is_________.

Accepted Answer

A)  less than 1 atm; 1 atm 
B)  1 atm; less than 1 atm 
C)  greater than 1 atm; 1 atm 
D)  1 atm; greater than 1 atm 
E)  1 atm; impossible to predict 
A)  less than 1 atm; 1 atm 
B)  1 atm; less than 1 atm 
C)  greater than 1 atm; 1 atm 
D)  1 atm; greater than 1 atm 
E)  1 atm; impossible to predict

Question 13

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 14

In which of the following phase changes is energy transferred to a substance?

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 
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

Question 15

Which of the following circumstances does NOT cause decompression sickness?

Accepted Answer

A)  a deep-sea diver suddenly ascending 
B)  flying in an airplane shortly after diving 
C)  hiking in the mountains 
D)  a miner coming out of a pressurized mine 
E)  cabin pressure in an airplane failing 
A)  a deep-sea diver suddenly ascending 
B)  flying in an airplane shortly after diving 
C)  hiking in the mountains 
D)  a miner coming out of a pressurized mine 
E)  cabin pressure in an airplane failing

Question 16

This diagram shows

Accepted Answer

A)  the decomposition of water. 
B)  the combustion of water. 
C)  ice changing to water (melting). 
D)  water changing to gas (boiling). 
E)  gas changing to liquid (condensation). 
A)  the decomposition of water. 
B)  the combustion of water. 
C)  ice changing to water (melting). 
D)  water changing to gas (boiling). 
E)  gas changing to liquid (condensation).

Question 17

Which of the following is the common treatment for the bends?

Accepted Answer

A)  No treatment exists. 
B)  A pressure decrease to a fraction of atmospheric pressure. 
C)  Treatment with nitrogen binding drugs. 
D)  A blood transfusion. 
E)  Slow depressurization in a hyperbaric chamber. 
A)  No treatment exists. 
B)  A pressure decrease to a fraction of atmospheric pressure. 
C)  Treatment with nitrogen binding drugs. 
D)  A blood transfusion. 
E)  Slow depressurization in a hyperbaric chamber.

Question 18

What is the relationship between polarity and vapor pressure?

Accepted Answer

A)  These two properties are unrelated. 
B)  The more polar the molecule, the higher the vapor pressure. 
C)  The less polar the molecule, the higher the vapor pressure. 
D)  Nonpolar molecules have lower vapor pressures. 
E)  The relationship changes depending upon the temperature. 
A)  These two properties are unrelated. 
B)  The more polar the molecule, the higher the vapor pressure. 
C)  The less polar the molecule, the higher the vapor pressure. 
D)  Nonpolar molecules have lower vapor pressures. 
E)  The relationship changes depending upon the temperature.

Question 19

Which molecule in this table has the highest boiling point?

Accepted Answer

A)  acetone 
B)  methanol 
C)  formic acid 
D)  chloroform 
E)  pentane 
A)  acetone 
B)  methanol 
C)  formic acid 
D)  chloroform 
E)  pentane

Question 20

Which of the following changes of state is correctly named?

Accepted Answer

A)  dry ice becoming a gas - melting 
B)  water on a hot sidewalk in summer changing to steam - vaporization 
C)  a friend's perfume producing an aroma that fills the room - evaporation 
D)  breath fogging a windshield on a cold day - deposition 
E)  making ice cream from milk in an ice cream maker - sublimation 
A)  dry ice becoming a gas - melting 
B)  water on a hot sidewalk in summer changing to steam - vaporization 
C)  a friend's perfume producing an aroma that fills the room - evaporation 
D)  breath fogging a windshield on a cold day - deposition 
E)  making ice cream from milk in an ice cream maker - sublimation

Which of the molecules in this table is the most volatile?

Why is water (H₂O) a liquid at room temperature while methane (CH₄) is a gas?

Which atom has the highest electronegativity in this molecule of acetone?

How does the pressure of a gas change when it is heated in a sealed container with a constant volume (note: it is not a good idea to do this without special equipment)?

Arrow B points to

Two sealed boxes are filled with gas. The first box contains more molecules moving faster and therefore a higher pressure. The second box contains fewer molecules moving slower and therefore a lower pressure. Why does the first box have a higher pressure?

Which statement best describes how the kinetic molecular view of gases can be used to explain the effect of gas temperature on gas pressure?

The temperature of a gas at 1.00 atm and 8.00C is increased to 20.0C, resulting in a change of pressure. What is the new pressure?

A scuba diver dives down to 15 m, where the pressure is 2.5 atm. The scuba diver then inhales 500. mL of air and holds his breath while ascending to the water surface, where the pressure is 1 atm. What is the volume of the air in the diver's lungs at the surface? Assume that T and n are constant.

Which of the following statements best describes why a higher concentration of carbon dioxide is present in exhaled breath compared to inhaled breath?

You have a balloon containing 1.4 L of gas in it at standard temperature and pressure. Which conversion factor would you use to convert this number to moles?

Atmospheric pressure at sea level is . At elevations higher than sea level, atmospheric pressure is_.

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?

In which of the following phase changes is energy transferred to a substance?

Which of the following circumstances does NOT cause decompression sickness?

This diagram shows

Which of the following is the common treatment for the bends?

What is the relationship between polarity and vapor pressure?

Which molecule in this table has the highest boiling point?

Which of the following changes of state is correctly named?

Measuring Matter and Energy

Atomic Structure and Nuclear Radiation

Compounds and Molecules

Chemical Quantities and Chemical Reactions

Organic Chemistry: Hydrocarbons

Organic Chemistry and Biomolecules

Solutions, Colloids and Membranes

Acids and Bases

The Reactions of Organic Functional Groups 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 5: Changes of State and the Gas Laws

Which of the molecules in this table is the most volatile?

Why is water (H2O) a liquid at room temperature while methane (CH4) is a gas?

Which atom has the highest electronegativity in this molecule of acetone?

How does the pressure of a gas change when it is heated in a sealed container with a constant volume (note: it is not a good idea to do this without special equipment)?

Arrow B points to

Two sealed boxes are filled with gas. The first box contains more molecules moving faster and therefore a higher pressure. The second box contains fewer molecules moving slower and therefore a lower pressure. Why does the first box have a higher pressure?

Which statement best describes how the kinetic molecular view of gases can be used to explain the effect of gas temperature on gas pressure?

The temperature of a gas at 1.00 atm and 8.00C is increased to 20.0C, resulting in a change of pressure. What is the new pressure?

A scuba diver dives down to 15 m, where the pressure is 2.5 atm. The scuba diver then inhales 500. mL of air and holds his breath while ascending to the water surface, where the pressure is 1 atm. What is the volume of the air in the diver's lungs at the surface? Assume that T and n are constant.

Which of the following statements best describes why a higher concentration of carbon dioxide is present in exhaled breath compared to inhaled breath?

You have a balloon containing 1.4 L of gas in it at standard temperature and pressure. Which conversion factor would you use to convert this number to moles?

Atmospheric pressure at sea level is ________. At elevations higher than sea level, atmospheric pressure is_________.

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?

In which of the following phase changes is energy transferred to a substance?

Which of the following circumstances does NOT cause decompression sickness?

This diagram shows

Which of the following is the common treatment for the bends?

What is the relationship between polarity and vapor pressure?

Which molecule in this table has the highest boiling point?

Which of the following changes of state is correctly named?

Measuring Matter and Energy

Atomic Structure and Nuclear Radiation

Compounds and Molecules

Chemical Quantities and Chemical Reactions

Organic Chemistry: Hydrocarbons

Organic Chemistry and Biomolecules

Solutions, Colloids and Membranes

Acids and Bases

The Reactions of Organic Functional Groups in Biochemistry

Carbohydrates: Structure and Function

Lipids: Structure and Function

Proteins: Structure and Function

Nucleotides and Nucleic Acids

Energy and Metabolism

Filters

Why is water (H₂O) a liquid at room temperature while methane (CH₄) is a gas?

Atmospheric pressure at sea level is . At elevations higher than sea level, atmospheric pressure is_.