Practice IMF and Phase Change

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Question #1

Define freezing.

A the phase transition from solid to gas

B the phase transition from gas to liquid

C the phase transition from gas to solid

D the phase transition from liquid to gas

E the phase transition from liquid to solid

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 gas to solid

D the phase transition from liquid to gas

E the phase transition from solid to gas

Question #3

Describe sweating in humans.

A The skin is cooled.

B It is an endothermic reaction.

C None of these

D All of these

E The sweat evaporates absorbing heat from the body.

Question #4

Define condensation.

A A liquid becomes a gas.

B A solid becomes a liquid.

C A liquid becomes a solid.

D A gas becomes a solid.

E A gas becomes a liquid.

Question #5

Define vaporization.

A A gas becomes a liquid.

B A gas becomes a solid.

C A liquid becomes a gas.

D A solid becomes a liquid.

E A solid becomes a gas.

Question #6

Identify the compound with the lowest boiling point.

A CH3CHO

B CH3CH2CH3

C (CH3)2O

D CH3OCH3

E CH3CN

Question #7

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

A dynamic equilibrium.

B condensation.

C heat of fusion.

D vaporization.

E volatile.

Question #8

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

A NH3 < PH3< CH4

B NH3 < CH4< PH3

C CH4 < PH3 < NH3

D CH4< NH3 < PH3

E PH3< NH3 < CH4

Question #9

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

A CO2

B not enough information

C O2

D CO

E N2

Question #10

Which compound will have the highest boiling point?

A CH4

B CH3CH3

C CH3CH2OH

D not enough information

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 2 has hydrogen bonding.

B Only compound 3 has hydrogen bonding.

C Only compound 1 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 dipole-dipole forces

C none of these

D X-forces

E hydrogen bonding

Question #13

What types of forces exist between I2 molecules?

A ion-dipole forces

B dispersion forces

C none of these

D dipole-dipole forces

E hydrogen bonding

Question #14

Which intermolecular forces are found in CO2?

A dispersion forces and dipole-dipole forces

B hydrogen bonding

C none of these

D dispersion forces

E dipole-dipole forces

Question #15

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

A none of these

B both solids and liquids

C liquids

D gases

E solids

Question #16

Which intermolecular forces are found in CCl4?

A dispersion forces

B hydrogen bonding

C none of these

D dipole-dipole forces

E X-forces

Question #17

Which molecule below has hydrogen bonding?

A all of these

B NH3

C H2O

D CH3OH

E HF

Question #18

Which molecule below has hydrogen bonding?

A H2

B CH4

C HCl

D CH3CH2OH

E all of these

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 none of these

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

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 CS2

B CF4

C CHCl3

D none of these

E Br2

Question #21

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

A nonpolar.

B polar.

C metallic.

D none of these

E nonmetallic.

Question #22

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

A dispersion forces

B hydrogen bonding

C dipole-dipole 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 Both CO and N2 must have the same boiling point.

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

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

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

E none of these

Question #24

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

A liquids

B solids

C both solids and liquids

D none of these

E gases

Question #25

Which noble gas has the highest boiling point?

A Kr

B Ar

C Ne

D He

E Xe

Question #26

Which intermolecular force increases with increasing molar mass?

A dipole-dipole forces

B dispersion forces

C X-forces

D none of these

E hydrogen bonding

Question #27

Which substance below has dipole-dipole forces?

A CH4

B CO2

C none of these

D F2

E H2S

Question #28

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

A none of these

B X-forces

C dispersion forces

D dipole-dipole forces

E hydrogen bonding

Question #29

Which intermolecular force is present in all molecules and atoms?

A dipole-dipole forces

B X-forces

C none of these

D hydrogen bonding

E dispersion forces

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 boiling

B sublimation

C evaporation

D melting

E condensation

Question #31

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

A solids

B none of these

C both solids and liquids

D gases

E 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 deposition.

B melting.

C none of these

D sublimation.

E condensation.

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 exothermic and the heat of fusion is negative.

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

D not enough information

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

Question #34

When you make ice cubes:

A it is an endothermic process.

B the heat of vaporization must be removed.

C none of these

D it is an exothermic process.

E the process is referred to scientifically as sublimation.

Question #35

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

A liquids

B both solids and liquids

C solids

D none of these

E gases

Question #36

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

A heat of fusion.

B heat of vaporization.

C cooling curve.

D heating curve.

E none of these

Question #37

The opposite process of freezing is:

A condensation.

B none of these

C sublimation.

D boiling.

E evaporation.

Question #38

Which of the following statements is false?

A none of these

B A puddle of water cools down as it evaporates.

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

D all of these

E Evaporation is an endothermic process.

Question #39

Evaporation is:

A increased by increasing temperature.

B all of these

C an endothermic process.

D a cooling process for humans when they sweat.

E the opposite process to condensation.

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Practice IMF and Phase Change

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