Question 1

Which of the following processes is an exothermic physical change?

Accepted Answer

A)  freezing 
B)  melting 
C)  vaporization 
D)  sublimation 
E)  All of the above are an exothermic physical change.

Question 2

A copper pipe with a mass of 1,200 g and a specific heat of 0.093 cal/g·°C absorbs 252 calories of heat.By how many degrees does the temperature of the pipe change?

Accepted Answer

A)  2.3 °C 
B)  2.8 × 104 °C 
C)  0.020 °C 
D)  0.44 °C 
E)  3.6 × 10-5 °C

Question 3

The relationship between concentration and pressure in Henry's law (  )is________.

Accepted Answer

A)  unrelated 
B)  exponential 
C)  directly proportional 
D)  inversely proportional 
E)  equal

Question 4

How do phase changes differ from chemical reactions?

Accepted Answer

A)  There is no difference between them. 
B)  Phase changes occur more rapidly than chemical reactions. 
C)  Only chemical reactions involve changes in energy. 
D)  Only chemical reactions follow the conservation of matter. 
E)  Phase changes do not involve breaking or making covalent bonds.

Question 5

What is the volume of 2.01 × 10-3 mol of oxygen at STP?

Accepted Answer

A)  8.97 × 10-5 L 
B)  0.00201 L 
C)  2.01 × 10-3 L 
D)  4.50 × 10-2 L 
E)  1.11 × 104 L

Question 6

You boil a pot of water (H2O)to make spaghetti and, when the water reaches its boiling point, you notice that it bubbles.What are these bubbles composed of?

Accepted Answer

A)  nothing 
B)  H2 
C)  O2 
D)  H2 and O2 
E)  H2O

Question 7

Which of the following is NOT a common use of a hyperbaric oxygen therapy (HBOT)chamber?

Accepted Answer

A)  treatment of diabetic wounds 
B)  treatment of hypertension 
C)  treatment of the bends 
D)  treatment of carbon monoxide poisoning 
E)  All of the above are common uses of HBOT.

Question 8

Which of the following are ways to increase the pressure of a gas?

Accepted Answer

A)  heating the gas 
B)  decreasing the volume of the gas by placing it into a smaller container 
C)  adding more gas molecules to the container 
D)  compressing the gas 
E)  All of the above are ways to increase the pressure of a gas.

Question 9

Which of the following statements BEST describes specific heat?

Accepted Answer

A)  It is the specific amount of heat that a substance has at any one time. 
B)  It is the amount of heat energy required to boil one gram of water at sea level. 
C)  It is the amount of heat energy actually transferred during heating. 
D)  It is the amount of heat energy required to melt a substance. 
E)  It is the amount of heat energy required to raise the temperature of one gram of a substance by one degree.

Question 10

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.

Question 11

Water has a higher heat of vaporization than carbon dioxide because water _______.

Accepted Answer

A)  is a liquid at room temperature 
B)  freezes at a higher temperature than carbon dioxide 
C)  has a lower molecular weight 
D)  has polar covalent bonds 
E)  has stronger intermolecular forces of attraction.

Question 12

What occurs over the course of the physical change illustrated below?

Accepted Answer

A)  Hydrogen bonds are broken. 
B)  Hydrogen bonds are formed. 
C)  Polar covalent bonds are broken. 
D)  Polar covalent bonds are formed. 
E)  Both hydrogen bonds and polar covalent bonds are broken.

Question 13

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 from high pressure in a hyperbaric chamber

Question 14

A nitrogen bubble with a volume of 0.0050 mL forms in the joint of a scuba diver as she ascends rapidly from a pressure of 4.1 atm to the surface, with a pressure of 1.0 atm.What is the volume of the bubble at the surface?

Accepted Answer

A)  820 mL 
B)  4.1 mL 
C)  0.0012 mL 
D)  0.021 mL 
E)  0.0050 mL

Question 15

Which of the following is the molar volume of a gas at STP?

Accepted Answer

A)  The molar volume depends on the gas. 
B)  1 L 
C)  1 mole 
D)  6.02 × 1023 L 
E)  22.4 L

Question 16

Hyperbaric oxygen therapy is the use of ________ to treat a variety of medical conditions.

Accepted Answer

A)  pure oxygen 
B)  oxygen at a pressure higher than atmospheric pressure 
C)  air without oxygen 
D)  oxygen at a pressure lower than atmospheric pressure 
E)  an oxygen tank

Question 17

Which statement BEST describes how heat is involved in the change in the diagram below?

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.

Question 18

A sample of gaseous neon has a volume of 68.2 L at STP.How many moles of neon are in the sample?

Accepted Answer

A)  0.328 mol 
B)  3.04 mol 
C)  68.2 mol 
D)  1530 mol 
E)  4.11 × 1025 mol

Question 19

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?

Accepted Answer

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

Question 20

Are any bonds in acetone, shown below, polar?

Accepted Answer

A)  No, none are polar. 
B)  Yes, the C-C bonds are polar. 
C)  Yes, the C=O bond is polar. 
D)  Yes, the C-H bonds are polar. 
E)  Yes, all bonds in acetone are polar.

Exam 7: Changes of State and Gas Laws

Which of the following processes is an exothermic physical change?

A copper pipe with a mass of 1,200 g and a specific heat of 0.093 cal/g·°C absorbs 252 calories of heat.By how many degrees does the temperature of the pipe change?

The relationship between concentration and pressure in Henry's law ( ) is________.

How do phase changes differ from chemical reactions?

What is the volume of 2.01 × 10^-3 mol of oxygen at STP?

You boil a pot of water (H₂O) to make spaghetti and, when the water reaches its boiling point, you notice that it bubbles.What are these bubbles composed of?

Which of the following is NOT a common use of a hyperbaric oxygen therapy (HBOT) chamber?

Which of the following are ways to increase the pressure of a gas?

Which of the following statements BEST describes specific heat?

Arrow B points to

Water has a higher heat of vaporization than carbon dioxide because water _______.

What occurs over the course of the physical change illustrated below?

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

A nitrogen bubble with a volume of 0.0050 mL forms in the joint of a scuba diver as she ascends rapidly from a pressure of 4.1 atm to the surface, with a pressure of 1.0 atm.What is the volume of the bubble at the surface?

Which of the following is the molar volume of a gas at STP?

Hyperbaric oxygen therapy is the use of ________ to treat a variety of medical conditions.

Which statement BEST describes how heat is involved in the change in the diagram below?

A sample of gaseous neon has a volume of 68.2 L at STP.How many moles of neon are in the sample?

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?

Are any bonds in acetone, shown below, polar?

Exam 7: Changes of State and Gas Laws

Which of the following processes is an exothermic physical change?

A copper pipe with a mass of 1,200 g and a specific heat of 0.093 cal/g·°C absorbs 252 calories of heat.By how many degrees does the temperature of the pipe change?

The relationship between concentration and pressure in Henry's law ( ) is________.

How do phase changes differ from chemical reactions?

What is the volume of 2.01 × 10-3 mol of oxygen at STP?

You boil a pot of water (H2O) to make spaghetti and, when the water reaches its boiling point, you notice that it bubbles.What are these bubbles composed of?

Which of the following is NOT a common use of a hyperbaric oxygen therapy (HBOT) chamber?

Which of the following are ways to increase the pressure of a gas?

Which of the following statements BEST describes specific heat?

Arrow B points to

Water has a higher heat of vaporization than carbon dioxide because water _______.

What occurs over the course of the physical change illustrated below?

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

A nitrogen bubble with a volume of 0.0050 mL forms in the joint of a scuba diver as she ascends rapidly from a pressure of 4.1 atm to the surface, with a pressure of 1.0 atm.What is the volume of the bubble at the surface?

Which of the following is the molar volume of a gas at STP?

Hyperbaric oxygen therapy is the use of ________ to treat a variety of medical conditions.

Which statement BEST describes how heat is involved in the change in the diagram below?

A sample of gaseous neon has a volume of 68.2 L at STP.How many moles of neon are in the sample?

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?

Are any bonds in acetone, shown below, polar?

What is the volume of 2.01 × 10^-3 mol of oxygen at STP?

You boil a pot of water (H₂O) to make spaghetti and, when the water reaches its boiling point, you notice that it bubbles.What are these bubbles composed of?