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IMFs, Properties and Phase Changes.

Total questions: 32

Worksheet time: 27mins

Name
Class
Date
1.

Which property decreases with stronger intermolecular forces?

a)

Surface tension

b)

vapor pressure

c)

melting point

d)

conductivity

2.

What is the main intermolecular force in methanol?

a)

hydrogen bonding

b)

dipole-dipole forces

c)

london dispersion forces

d)

none

3.

Larger molecules will have more of which intermolecular force?

a)

hydrogen bonding

b)

dipole-dipole forces

c)

london dispersion forces

d)

none

4.

What are hydrogen bonds?

a)

Any time hydrogen is bonded to another atom

b)

Any time hydrogen is bonded to N, O, or F

c)

An interaction between molecules with H-N, H-O, or H-F bonds in them

d)

Any attraction to hydrogen atoms

5.

Which of these substances is expected to have the highest boiling point?

a)

NH3

b)

NF3

c)

C2H6

d)

C4H8

6.

What is the relationship between vapor pressure and intermolecular forces?

a)

Vapor pressure does not depend upon intermolecular forces, only the strength of chemical bonds.

b)

Stronger intermolecular forces cause particles to repel each other, raising the vapor pressure.

c)

Stronger IMFs cause particles to stick together, lowering the vapor pressure.

d)

Intermolecular forces cause all liquids to have the same vapor pressure.

7.

Based on the strength of intermolecular forces, which would you expect to have the highest vapor pressure?

a)

NF3

b)

NH3

c)

CH4

d)

C5H12

8.

Select the correct order of molecules from lowest to highest boiling point, based on intermolecular forces.

a)

CH4 < C2H6 < H2O < SO2

b)

H2O < SO2 < C2H6 < CH4

c)

C2H6 < CH4 < H2O < SO2

d)

CH4 < C2H6 < SO2 < H2O

9.
What explains the very high melting and boiling point of water
a)
Strong dipole-dipole bonds between water molecules
b)
Strong hydrogen bonds between water molecules
c)
Dispersion forces which are present in all molecules
d)
Asymmetrical shape of the polar bonds.
10.

The weaker the intermolecular forces of a substance the _____________ the boiling point

a)

higher

b)

lower

11.

According to the reference table, what is the boiling point of ethanoic acid at 80 kPa?

a)

28 oC

b)

100oC

c)

111oC

d)

125oC

12.

Which liquid has the highest vapor pressure at 75oC?

a)

ethanoic acid

b)

ethanol

c)

propanone

d)

water

13.

Which model represents a LOWER Vapor Pressure?

a)

A

b)

B

14.

Which substance has the weakest intermolecular forces?

a)

Substance A, boiling point of 75 °C

b)

Substance B, boiling point of 105 °C

c)

Substance C, boiling point of 25 °C

d)

Substance d, boiling point of 45 °C

15.
The phase change from water vapor to liquid water is known as...
a)
evaporation
b)
precipitation
c)
condensation
d)
sublimation
16.

Phase change going from a Liquid to a Gas...

a)

Vaporization

b)

Deposition

c)

Condensation

d)

Melting

17.

Phase change going from a Solid to a Gas...

a)

Deposition

b)

Sublimation

c)

Condensation

d)

Recombination

18.

What state/phase is the object likely from points A to B?

a)

Solid

b)

Liquid

c)

Gas

d)

Plasma

19.
When the temperature of matter increases the particles...
a)
speed up and move closer
b)
speed up and move farther apart
c)
slow down and move closer together
d)
slow down and move farther apart
20.
The graph shows a cooling curve for an unknown substance.  What is happening during segment DE?
a)
boiling
b)
condensation
c)
freezing
d)
melting
21.

Which letter on the diagram represents a gas?

a)

A

b)

B

c)

C

d)

D

22.

Which letter on the diagram represents a liquid?

a)

A

b)

B

c)

C

d)

D

23.

What does point B represent?

a)

Triple point

b)

Critical point

c)

Equilibrium point

d)

Normal melting point

24.

Which letter on the diagram represents a solid?

a)

A

b)

B

c)

C

d)

D

25.

The temperature and pressure conditions at which the solid, liquid, and gas phases of a substance exist at the same time is called the

a)

Critical point

b)

Triple point

c)

Melting point

d)

Boiling point

26.

What is the normal melting point of this substance?

a)

150°C

b)

100°C

c)

-50°C

d)

0°C

27.

Which letter on the diagram represents the triple point?

a)

A

b)

B

c)

C

d)

D

28.

What is true regarding CO2 for temperatures above 31°C?

a)

It does not exist

b)

It decomposes

c)

It cannot be condensed back into a liquid

d)

It is a plasma

29.

What is the normal melting point of this substance?

a)

40°C

b)

60°C

c)

100°C

d)

110°C

30.

What phase change occurs from F to E?

a)

Sublimation

b)

Deposition

c)

Melting

d)

Condensation

31.

What phase change occurs from C to D?

a)

Condensation

b)

Vaporization

c)

Melting

d)

Sublimation

32.

What phase change occurs from E to C?

a)

Sublimation

b)

Freezing

c)

Melting

d)

Vaporization

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