Practice IMF and Phase Change

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Question #1

Define freezing.

A the phase transition from liquid to solid

B the phase transition from gas to solid

C the phase transition from solid to gas

D the phase transition from gas to liquid

E the phase transition from liquid to gas

Question #2

Define sublimation.

A the phase transition from gas to liquid

B the phase transition from liquid to solid

C the phase transition from solid to gas

D the phase transition from liquid to gas

E the phase transition from gas to solid

Question #3

Describe sweating in humans.

A None of these

B It is an endothermic reaction.

C The sweat evaporates absorbing heat from the body.

D The skin is cooled.

E All of these

Question #4

Define condensation.

A A gas becomes a liquid.

B A solid becomes a liquid.

C A gas becomes a solid.

D A liquid becomes a solid.

E A liquid becomes a gas.

Question #5

Define vaporization.

A A liquid becomes a gas.

B A gas becomes a solid.

C A gas becomes a liquid.

D A solid becomes a gas.

E A solid becomes a liquid.

Question #6

Identify the compound with the lowest boiling point.

A CH3CN

B CH3CHO

C (CH3)2O

D CH3OCH3

E CH3CH2CH3

Question #7

The change of a substance from a liquid to a gaseous form is called:

A volatile.

B heat of fusion.

C vaporization.

D condensation.

E dynamic equilibrium.

Question #8

Rank the compounds NH3, CH4, and PH3 in order of increasing boiling point.

A CH4 < PH3 < NH3

B NH3 < PH3< CH4

C PH3< NH3 < CH4

D CH4< NH3 < PH3

E NH3 < CH4< PH3

Question #9

Which substance would be expected to have the highest boiling point?

A not enough information

B N2

C CO2

D CO

E O2

Question #10

Which compound will have the highest boiling point?

A not enough information

B CH3CH3

C CH3CH2OH

D CH4

E CH3C(O)CH3

Question #11

Consider the three compounds below, then choose the compound(s) that have hydrogen bonding.
1. H2
2. CH4
3. HF

A Only compound 3 has hydrogen bonding.

B Only compound 1 has hydrogen bonding.

C Only compound 2 has hydrogen bonding.

D All three of these compounds have hydrogen bonding.

Question #12

Which intermolecular force found in CCl2H2 is the strongest?

A dispersion forces

B hydrogen bonding

C X-forces

D none of these

E dipole-dipole forces

Question #13

What types of forces exist between I2 molecules?

A ion-dipole forces

B dipole-dipole forces

C hydrogen bonding

D none of these

E dispersion forces

Question #14

Which intermolecular forces are found in CO2?

A dispersion forces and dipole-dipole forces

B none of these

C hydrogen bonding

D dipole-dipole forces

E dispersion forces

Question #15

Which state of matter has a low density and is easily compressed?

A gases

B both solids and liquids

C liquids

D solids

E none of these

Question #16

Which intermolecular forces are found in CCl4?

A X-forces

B none of these

C hydrogen bonding

D dipole-dipole forces

E dispersion forces

Question #17

Which molecule below has hydrogen bonding?

A H2O

B CH3OH

C HF

D NH3

E all of these

Question #18

Which molecule below has hydrogen bonding?

A CH3CH2OH

B HCl

C all of these

D CH4

E H2

Question #19

Which statement below is false?

A The large electronegativity difference between hydrogen and an F, O, or N atom is essential for the formation of a hydrogen bond.

B A hydrogen bond is the strongest of the intermolecular forces.

C A hydrogen bond is only 2-5% the strength of a typical covalent bond.

D none of these

E A hydrogen atom must be bonded directly to fluorine, oxygen, or nitrogen to exhibit hydrogen bonding.

Question #20

Which substance is most likely to be miscible with water?

A CHCl3

B CF4

C Br2

D none of these

E CS2

Question #21

Substance A is a molecular compound that dissolves in gasoline but not in water. The molecules of A are very likely:

A none of these

B metallic.

C nonmetallic.

D polar.

E nonpolar.

Question #22

Which intermolecular force is common to all polar molecules but NOT nonpolar molecules?

A dipole-dipole forces

B hydrogen bonding

C dispersion forces

D X-forces

E none of these

Question #23

Assuming that the molecules carbon monoxide (CO) and nitrogen (N2) have similar electron clouds, which statement below is TRUE?

A CO has the higher boiling point because it experiences dipole-dipole forces.

B N2 has the higher boiling point because it experiences dipole-dipole forces.

C none of these

D Both CO and N2 must have the same boiling point.

E The N2 has the higher boiling point because it has greater dispersion forces.

Question #24

Which state of matter has a low density and an indefinite volume?

A liquids

B gases

C solids

D none of these

E both solids and liquids

Question #25

Which noble gas has the highest boiling point?

A Kr

B Xe

C Ar

D He

E Ne

Question #26

Which intermolecular force increases with increasing molar mass?

A none of these

B dipole-dipole forces

C hydrogen bonding

D dispersion forces

E X-forces

Question #27

Which substance below has dipole-dipole forces?

A CO2

B H2S

C CH4

D none of these

E F2

Question #28

Which intermolecular force is due to the formation of an instantaneous dipole?

A dipole-dipole forces

B X-forces

C hydrogen bonding

D none of these

E dispersion forces

Question #29

Which intermolecular force is present in all molecules and atoms?

A dipole-dipole forces

B dispersion forces

C hydrogen bonding

D X-forces

E none of these

Question #30

Paradichlorobenzene, a material used in “moth balls,” is known to go directly from a solid form to a gaseous form. This process is known as:

A sublimation

B evaporation

C melting

D condensation

E boiling

Question #31

Which state of matter has a high density and a definite volume?

A solids

B gases

C liquids

D none of these

E both solids and liquids

Question #32

Gaseous water vapor can frost the windows of a car on a cold morning. This process of a gas changing directly into a solid is known as:

A condensation.

B deposition.

C sublimation.

D melting.

E none of these

Question #33

Which statement is TRUE in describing what occurs when a solid melts to a liquid?

A The process is exothermic and the heat of fusion is positive.

B The process is endothermic and the heat of fusion is negative.

C The process is endothermic and the heat of fusion is positive.

D not enough information

E The process is exothermic and the heat of fusion is negative.

Question #34

When you make ice cubes:

A the process is referred to scientifically as sublimation.

B it is an exothermic process.

C none of these

D the heat of vaporization must be removed.

E it is an endothermic process.

Question #35

Which state of matter has a high density and an indefinite shape?

A liquids

B none of these

C solids

D gases

E both solids and liquids

Question #36

The amount of heat required to melt one mole of a solid is called the:

A heat of fusion.

B none of these

C heating curve.

D heat of vaporization.

E cooling curve.

Question #37

The opposite process of freezing is:

A boiling.

B sublimation.

C evaporation.

D none of these

E condensation.

Question #38

Which of the following statements is false?

A Evaporation is an endothermic process.

B all of these

C As a liquid is converted into a gas, the liquid absorbs heat.

D A puddle of water cools down as it evaporates.

E none of these

Question #39

Evaporation is:

A an endothermic process.

B the opposite process to condensation.

C increased by increasing temperature.

D a cooling process for humans when they sweat.

E all of these

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Practice IMF and Phase Change

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