Phases

Question 1

When a material undergoes a phase change, only ________________ bonds are broken or formed.

a) intermolecular
b) intramolecular

Answer 1

a) intermolecular

between molecules, not within molecules

Question 2

What is the opposite of freezing?

Answer 2

fusion

Question 3

What is the opposite of condensation?

Answer 3

vapourization

Question 4

What is the process of sublimation?

a) gas –> liquid
b) solid –> gas
c) gas –> solid
d) liquid –> gas

Answer 4

b) solid –> gas

Question 5

What is the opposite of sublimation?

Answer 5

deposition

Question 6

Does a gas or solid have higher entropy?

Answer 6

gas

Question 7

What are the 5 assumptions of the kinetic molecular theory of ideal gases?

Answer 7

1. gas particles extremely small –> have mass, but no volume
2. constant, random, straight-line motion
3. elastic collisions –> momentum and total KE conserved
4. gas particles do NOT experience intermolecular forces with other gas particles
5. average KE of entire gas sample is proportional to temperature

Question 8

What does a barometer measure?

Answer 8

atmospheric pressure

Question 9

What does a manometer measure?

Answer 9

pressure of an unknown gas

Question 10

Convert 1 atm to Torr, mmHg, kPa, and bar.

Answer 10

1 atm = 760 Torr = 760 mmHg = 101 kPa = 1 bar

Question 11

What volume does 1 mol of an ideal gas occupy at STP (standard temperature and pressure)?

Answer 11

22.4 L

STP= 273.15 K and 1 atm

Question 12

What does a calorimeter measure?

Answer 12

energy changes of a given process

Question 13

What is the definition of specific heat capacity (c)?

Answer 13

amount of energy required to change the temperature of 1 gram of a substance by 1 K

Question 14

Why does ice float in water?

Answer 14

less dense than water