Question 1

Which transformation is evaporation?

Accepted Answer

A) liquid → solid 
B) liquid → gas 
C) solid → liquid 
D) solid → gas 
E) gas → solid 
A) liquid → solid 
B) liquid → gas 
C) solid → liquid 
D) solid → gas 
E) gas → solid

Question 2

Which of the following cannot have hydrogen bonds?

Accepted Answer

A) H2O 
B) HCl 
C) HF 
D) CH3NH2 
E) NH3 
A) H2O 
B) HCl 
C) HF 
D) CH3NH2 
E) NH3

Question 3

At a high altitude water boils at 95°C instead of 100°C as at sea level because

Accepted Answer

A) the atmospheric pressure is greater. 
B) the atmospheric pressure is less. 
C) the climate is cooler. 
D) the vapor pressure of water is greater. 
E) the vapor pressure of water is less. 
A) the atmospheric pressure is greater. 
B) the atmospheric pressure is less. 
C) the climate is cooler. 
D) the vapor pressure of water is greater. 
E) the vapor pressure of water is less.

Question 4

The vapor pressure of a liquid

Accepted Answer

A) decreases with increasing temperature. 
B) is independent of temperature. 
C) is equal to one atmosphere at the normal boiling point. 
D) cannot be measured. 
A) decreases with increasing temperature. 
B) is independent of temperature. 
C) is equal to one atmosphere at the normal boiling point. 
D) cannot be measured.

Question 5

When the volume of a gas is plotted against the Celsius temperature while holding pressure and the number of moles constant,the x-intercept will occur at what temperature?

Accepted Answer

A) 0°C 
B) -273°C 
C) the boiling point of the gas 
D) the melting point of the gas 
E) 100°C 
A) 0°C 
B) -273°C 
C) the boiling point of the gas 
D) the melting point of the gas 
E) 100°C

Question 6

Which transformation is freezing?

Accepted Answer

A) liquid → solid 
B) liquid → gas 
C) solid → liquid 
D) solid → gas 
E) gas → liquid 
A) liquid → solid 
B) liquid → gas 
C) solid → liquid 
D) solid → gas 
E) gas → liquid

Question 7

How many grams of N2 are contained in an 11.2 liter sample at STP?

Accepted Answer

A) 7.00 
B) 11.2 
C) 14.0 
D) 28.0 
E) 6.02 × 1023 
A) 7.00 
B) 11.2 
C) 14.0 
D) 28.0 
E) 6.02 × 1023

Question 8

Which assumption of Kinetic Molecular Theory is not followed when a real gas shows non-ideal behavior?

Accepted Answer

A) Gas molecules move at random with no attractive forces between them. 
B) The velocity of gas molecules is proportional to their Kelvin temperature. 
C) The amount of space occupied by a gas is much greater than the space occupied by the actual gas molecules. 
D) In collisions with the walls of the container or with other molecules,energy is conserved. 
E) Collisions with the walls of the container or with other molecules are elastic. 
A) Gas molecules move at random with no attractive forces between them. 
B) The velocity of gas molecules is proportional to their Kelvin temperature. 
C) The amount of space occupied by a gas is much greater than the space occupied by the actual gas molecules. 
D) In collisions with the walls of the container or with other molecules,energy is conserved. 
E) Collisions with the walls of the container or with other molecules are elastic.

Question 9

A mixture of the gases N2,O2,and He has a total pressure of 760 mm Hg.If the partial pressure of N2 is 90 mm Hg and of O2 is 270 mm Hg,what is the partial pressure of He?

Accepted Answer

A) 1120 mm Hg 
B) 760 mm Hg 
C) 400 mm Hg 
D) 360 mm Hg 
E) 120 mm Hg 
A) 1120 mm Hg 
B) 760 mm Hg 
C) 400 mm Hg 
D) 360 mm Hg 
E) 120 mm Hg

Question 10

Sketch a graph illustrating Charles's Law.Use a gas sample with a volume of 2.0 L at 0.75 atm and 27°C,and show at least two other points.

Accepted Answer

Graph should be a straight line sloping

Question 11

The process of sublimation is ________ and involves a(an)________ in entropy.

Accepted Answer

A) exothermic; increase 
B) exothermic; decrease 
C) endothermic; increase 
D) endothermic; decrease 
E) endothermic; no change 
A) exothermic; increase 
B) exothermic; decrease 
C) endothermic; increase 
D) endothermic; decrease 
E) endothermic; no change

Question 12

In comparing liquids and gases,liquids have ________ compressibility and ________ density.

Accepted Answer

A) smaller; smaller 
B) smaller; greater 
C) greater; smaller 
D) greater,greater 
E) none of the above 
A) smaller; smaller 
B) smaller; greater 
C) greater; smaller 
D) greater,greater 
E) none of the above

Question 13

Which combination of characteristics is most likely to be associated with molecules having strong dipole-dipole interactions?
I.polar bond
II.asymmetric shape
III.relatively low boiling point
IV.large surface area

Accepted Answer

A) I and III 
B) II and IV 
C) I and II 
D) III and IV 
E) I,II,III,and IV 
A) I and III 
B) II and IV 
C) I and II 
D) III and IV 
E) I,II,III,and IV

Question 14

A 250.mL sample of gas at 1.00 atm and 20.0°C has the temperature increased to 40.0°C and the volume increased to 500.mL.What is the new pressure?

Accepted Answer

A) 0.374 atm 
B) 0.468 atm 
C) 0.534 atm 
D) 1.87 atm 
E) 2.14 atm 
A) 0.374 atm 
B) 0.468 atm 
C) 0.534 atm 
D) 1.87 atm 
E) 2.14 atm

Question 15

Which of the assumptions of the kinetic-molecular theory best explains Dalton's law of partial pressures?

Accepted Answer

A) Gas molecules move at random with no attractive forces between them. 
B) The velocity of gas molecules is proportional to their Kelvin temperature. 
C) The amount of space occupied by a gas is much greater than the space occupied by the actual gas molecules. 
D) In collisions with the walls of the container or with other molecules,energy is conserved. 
E) Collisions with the walls of the container or with other molecules are elastic. 
A) Gas molecules move at random with no attractive forces between them. 
B) The velocity of gas molecules is proportional to their Kelvin temperature. 
C) The amount of space occupied by a gas is much greater than the space occupied by the actual gas molecules. 
D) In collisions with the walls of the container or with other molecules,energy is conserved. 
E) Collisions with the walls of the container or with other molecules are elastic.

Question 16

A 65 mL sample of argon gas has a temperature of 325°C.What will the temperature be in °C when the volume of the gas is decreased to 25 mL at constant pressure?

Accepted Answer

A) 65°C 
B) 125°C 
C) -43°C 
D) 1280°C 
E) 641°C 
A) 65°C 
B) 125°C 
C) -43°C 
D) 1280°C 
E) 641°C

Question 17

Consider a sample of helium and a sample of neon,both at 30.0°C and 1.5 atm.Both samples have a volume of 5.0 liters.Which statement concerning these samples is not true?

Accepted Answer

A) Each sample contains the same number of atoms of gas. 
B) Each sample weighs the same amount. 
C) Each sample contains the same number of moles of gas. 
D) The density of the neon is greater than the density of the helium. 
E) none of the above 
A) Each sample contains the same number of atoms of gas. 
B) Each sample weighs the same amount. 
C) Each sample contains the same number of moles of gas. 
D) The density of the neon is greater than the density of the helium. 
E) none of the above

Question 18

Calculate the volume of 5.00 mol of helium at 120.°C and 1520 mm Hg.

Accepted Answer

A) 323 liters 
B) 80.6 liters 
C) 0.106 liters 
D) 0.0324 liters 
E) none of the above 
A) 323 liters 
B) 80.6 liters 
C) 0.106 liters 
D) 0.0324 liters 
E) none of the above

Question 19

Which molecule will undergo only London dispersion forces when interacting with other molecules of the same kind?

Accepted Answer

A) HF 
B) CH2Cl2 
C) C4H10 
D) NaC2H3O2 
E) C2H5OH 
A) HF 
B) CH2Cl2 
C) C4H10 
D) NaC2H3O2 
E) C2H5OH

Question 20

Which description best fits a gas?

Accepted Answer

A) definite shape and volume; strong intermolecular attractions 
B) definite volume; shape of container; moderate intermolecular attractions 
C) definite volume; shape of container; weak intermolecular attractions 
D) volume and shape of container; no intermolecular attractions 
E) volume and shape of container; strong intermolecular attractions 
A) definite shape and volume; strong intermolecular attractions 
B) definite volume; shape of container; moderate intermolecular attractions 
C) definite volume; shape of container; weak intermolecular attractions 
D) volume and shape of container; no intermolecular attractions 
E) volume and shape of container; strong intermolecular attractions

Exam 8: Gases, liquids, and Solids

Which transformation is evaporation?

Which of the following cannot have hydrogen bonds?

At a high altitude water boils at 95°C instead of 100°C as at sea level because

The vapor pressure of a liquid

When the volume of a gas is plotted against the Celsius temperature while holding pressure and the number of moles constant,the x-intercept will occur at what temperature?

Which transformation is freezing?

How many grams of N2 are contained in an 11.2 liter sample at STP?

Which assumption of Kinetic Molecular Theory is not followed when a real gas shows non-ideal behavior?

A mixture of the gases N2,O2,and He has a total pressure of 760 mm Hg.If the partial pressure of N2 is 90 mm Hg and of O2 is 270 mm Hg,what is the partial pressure of He?

Sketch a graph illustrating Charles's Law.Use a gas sample with a volume of 2.0 L at 0.75 atm and 27°C,and show at least two other points.

The process of sublimation is ________ and involves a(an)________ in entropy.

In comparing liquids and gases,liquids have ________ compressibility and ________ density.

Which combination of characteristics is most likely to be associated with molecules having strong dipole-dipole interactions? I.polar bond II.asymmetric shape III.relatively low boiling point IV.large surface area

A 250.mL sample of gas at 1.00 atm and 20.0°C has the temperature increased to 40.0°C and the volume increased to 500.mL.What is the new pressure?

Which of the assumptions of the kinetic-molecular theory best explains Dalton's law of partial pressures?

A 65 mL sample of argon gas has a temperature of 325°C.What will the temperature be in °C when the volume of the gas is decreased to 25 mL at constant pressure?

Consider a sample of helium and a sample of neon,both at 30.0°C and 1.5 atm.Both samples have a volume of 5.0 liters.Which statement concerning these samples is not true?

Calculate the volume of 5.00 mol of helium at 120.°C and 1520 mm Hg.

Which molecule will undergo only London dispersion forces when interacting with other molecules of the same kind?

Which description best fits a gas?

Matter and Measurements

Atoms and the Periodic Table

Ionic Compounds

Molecular Compounds

Classification and Balancing of Chemical Reactions

Chemical Reactions: Mole and Mass Relationships

Chemical Reactions: Energy, rates, and Equilibrium

Solutions

Acids and Bases

Nuclear Chemistry

Introduction to Organic Chemistry: Alkanes

Alkenes, alkynes, and Aromatic Compounds

Some Compounds With Oxygen, sulfur, or a Halogen

Amines

Aldehydes and Ketones

Carboxylic Acids and Their Derivatives

Amino Acids and Proteins

Enzymes and Vitamins

The Generation of Biochemical Energy

Carbohydrates

Carbohydrate Metabolism

Lipids

Lipid Metabolism

Nucleic Acids and Protein Synthesis

Genomics

Protein and Amino Acid Metabolism

Chemical Messengers: Hormones, neurotransmitters, and Drugs

Body Fluids

Filters

How many grams of N₂ are contained in an 11.2 liter sample at STP?

A mixture of the gases N₂,O₂,and He has a total pressure of 760 mm Hg.If the partial pressure of N₂ is 90 mm Hg and of O₂ is 270 mm Hg,what is the partial pressure of He?

The process of sublimation is and involves a(an) in entropy.

In comparing liquids and gases,liquids have compressibility and density.