Unit 10 Exam Review (Powerpoint)

Question 1

The direct change of a substance from a solid to a gas is called ______:

Answer 1

sublimation

Question 2

What is a key difference between a liquid and a gas?:

Answer 2

particles are moving faster in a gas

Question 3

Which are the first particles to evaporate from a liquid?:

Answer 3

the ones with the highest KE

Question 4

If a liquid is sealed in a container and kept at a constant temperature, how does its vapour pressure change over time?:

Answer 4

Increases at first, then is constant

Question 5

What causes gas pressure in a container, such as a helium balloon?:

Answer 5

The particles bouncing off the walls of the balloon

Question 6

When the vapour pressure of a liquid is equal to the atmospheric pressure, the liquid _______:

Answer 6

boils

Question 7

The escape of molecules from the surface of a liquid is known as _______:

Answer 7

evaporation

Question 8

Which of the following will evaporate the fastest?:
A. Water at 20ºC
B. Water at 40ºC
C. Water at 60ºC
D. All will evaporate at the same pace

Answer 8

Water at 60ºC

Question 9

The average kinetic energy of water molecules is greatest in which of the following?:
     A. Steam at 110ºC
     B. Liquid water at 373 K
     C. Solid substance at -15ºC
     D. All are the same

Answer 9

Steam at 110ºC

Question 10

What is the pressure (in kPa) when a liquid is boiling at its normal boiling point?:

Answer 10

101.3 kPa

Question 11

What happens to the rate of evaporation of a liquid as the liquid is cooled?:

Answer 11

The rate decrease

Question 12

Why does a liquid’s rate of evaporation increase when the liquid is heated?:

Answer 12

Particles have higher amount of energy; particles can overcome attractive forces holding them together

Question 13

What happens to the average kinetic energy of the particles in a sample of matter as the temperature of the sample is increased?:

Answer 13

it increases

Question 14

In a dynamic equilibrium between the liquid state and the gas state, what is true about the rate of evaporation?:

Answer 14

it equals the rate of condensation

Question 15

Consider an iron cube and an aluminum cube. If the two cubes were at the same temperature, how would the average kinetic energy of the Fe particles compare with Al?:

Answer 15

They would be the same

Question 16

What is the pressure (in atm) at the normal boiling point of water?:

Answer 16

1 atm

Question 17

How many phases of water are in equilibrium at the triple point?:

Answer 17

3

Question 18

A process that absorbs heat is called a(n) ________ process:

Answer 18

endothermic

Question 19

A piece of metal is heated, the submerged in cool water. The temperature of the water _____ and the temperature of the metal ________:

Answer 19

increases, decreases

Question 20

The process used to measure the amount of heat gained or lost during a chemical or physical process is called:

Answer 20

calorimetry