Intermolecular Forces: Liquids, Slids, and Phase Changes Flashcards Preview

Chem 1410 - UNT > Intermolecular Forces: Liquids, Slids, and Phase Changes > Flashcards

Flashcards in Intermolecular Forces: Liquids, Slids, and Phase Changes Deck (22):
1

The ________ energy in the form of intermolecular forces tends to draw molecules together.

Potential

2

The _______ energy associated with the random motion of the molecules tends to _____ them.

kinetic; disperse

3

The intermolecular forces, potential energy, and kinetic energy explain the __________.

phase changes

4

In a gas, the potential energy (energy of attraction) is _____ relative to the kinetic energy (energy of motion). Thus, on average, the particles are ____ apart.

small; far

5

In a liquid, attractions are _________ because tha particles are stronger because the articles are touching, but they have enough _____________ to move randomly around each other.

stronger; kinetic energy

6

Table 12.1 A Macroscopic Comparison of Gases, Liquids, and Solids

State Shape & Volume Compress. Flow Ability
Solid ______ its own
shape & volume

Gas _____ to shape of
container

Liquid _____ to shape of
container; _____ limited
by suface

Table 12.1 A Macroscopic Comparison of Gases, Liquids, and Solids

State Shape & Volume Compress. Flow Ability
Solid MAINTAINS its own Almost none Almost none
shape & volume

Gas CONFORMS to shape of High High
conainer

Liquid CONFORMS to shape of Very low Moderate
container; VOLUME limited by surface

7

As temperature increases, KE _______, so the faster moving particles overcome attractions more _____.

increases; rapidly

8

As temperature decreases, particles _____, so ______ can pull them together.

slow; attractions

9

Gas to liquid =

Condensation

10

Liquid to gas =

Vaporization

11

Liquid to solid =

Freezing

12

Solid to Liquid =

Melting or Fusion

13

Gas to solid =

Deposition

14

Solid to gas =

Sublimation

15

Condensing, Freezing, Depositing are ______ changes

Exothermic

16

Melting, Vaporzing, Subliming are ______ changes

Endothermic

17

Within a phase, heat flow is accompanied by a _______________, which is associated with a change iin average _____ are the most probable speed of the molecules changes.

Change in temperature; KE

18

The heat released or absorbed depends on the ____ of substance, the molar ___________ for that phase, and the change in _______.

amount; heat capacity; temperature

19

During a phase change, heat flow occurs at a ______ temperature, which is associated with a change in average ______ as the average distance between molecules __________.

constant; PE; changes

20

Phase changes in open containers are _____.

irreversible

21

Phase changes in a closed container are _____.

reversible

22

In a closed container, phase changes are _______ and reach __________.

reversible; equilibrium