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U1LC2 REVIEW

Total questions: 47

Worksheet time: 2hrs 45mins

Name
Class
Date
1.

Which is an example of an endothermic reaction?

a)

gas --> liquid

b)

solid --> liquid

c)

liquid --> solid

2.

In an endothermic process ...

a)

energy is added to the system

b)

energy is released from the system

3.

Match the processes

a)

Example of an endothermic process

1.

solid --> gas

b)

Example of an exothermic process

2.

gas --> solid

c)

Exothermic Process

3.

energy is released

d)

Endothermic Process

4.

energy is added

4.

A higher boiling point indicates...

a)

a greater density

b)

a lower density

c)

a greater attraction between particles

d)

a lower attraction between particles

5.

If a substance has stronger forces it will...

a)

have a higher boiling point

b)

have a lower boiling point

c)

have a higher density

d)

have a lower density

6.

Which is NOT a way to know if a substance has reached boiling

a)

You'll see bubbles

b)

The liquid will begin to turn into a gas

c)

The temperature will continue to increase

d)

The temperature will plateau

7.

The melting point of the sample is

a)

-60 ºC

b)

-100 ºC

c)

60 ºC

d)

100 ºC

8.

Given the heating curve of a solid being heated at a constant rate, what is the boiling point of this substance?

a)

20°C

b)

50°C

c)

110°C

d)

170°C

9.
What line segment represents only the solid state?
a)
A-B
b)
B-C
c)
C-D
d)
D-E
10.
Which process takes the longest to occur?
a)
melting
b)
boiling
c)
freezing
d)
heating the solid
11.
What state(s) of matter are present at D-E?
a)
Solid-liquid
b)
Liquid
c)
Liquid-gas
d)
Gas-Solid
12.

In a heating curve, diagonal lines indicate temperature is __________, while flat lines indicate temperature is __________.

a)

Constant, changing

b)

Changing, constant

13.

At what temperature does the substance in the graph freeze?

a)

140°C

b)

100°C

c)

40°C

d)

0°C

14.

At what temperature does the substance in the graph condense?

a)

140°C

b)

100°C

c)

40°C

d)

0°C

15.

What state of matter/phase change is occurring during line segment D on the graph?

a)

Gas

b)

Condensation

c)

Liquid

d)

Freezing

e)

Solid

16.

The graph represents the temperature of a substance while it is cooled.


At what interval is the substance a liquid and a solid?

a)

AB

b)

BC

c)

CD

d)

DE

e)

EF

17.

How many Joules of energy are required to make 0.100 kg of ice at 0 οC completely melt?

The specific latent heat of fusion of ice is 334000 J/kg

a)
200 J
b)
400 J
c)
33,400 J
d)
2,000,000 J
18.

Calculate the amount of energy required to melt 35.0 grams of ice.

 Hf = 80.0 cal/g,  Hv = 560.0 cal/g

(Hint: If you are melting, do you use the Heat of Fusion or Vaporization?)

a)
19,600 cal
b)
35.0 cal
c)
2,800 cal 
d)
1,568,000 cal 
19.

How many calories are required to boil 75 grams of water?
Hf = 80.0 cal/g,  Hv = 560.0 cal/g

(Hint: If you are boiling, do you use the Heat of Fusion or Vaporization?)

a)
6,000 cal
b)
3,360,000 cal
c)
42,000 cal
d)
7.46 cal
20.

When 20 g of a substance are completely melted at its melting point, 3444 J are absorbed. What is the heat of fusion of this substance?

a)

68880 J/g

b)

172.2 J/g

c)

0.0058 J/g

21.

What is the total pressure of the heliox gas in the diagram?

a)

300 kPa

b)

100 kPa

c)

400 kPa

d)

500 kPa

22.

In a mixture of gases, each gas contributes to the total pressure. The individual contribution of each gas is known as the _________________.

a)

partial volume

b)

partial pressure

c)

molar mass

d)

mole ratio

23.

A container holds three gases: oxygen, carbon dioxide, and helium. The total pressures of the three gases is 9 atm, respectively. If there is an equal amount of all 3 gases, what is the partial pressure of each?

a)

300 atm

b)

0.30 atm

c)

3.00 atm

d)

320 atm

24.

Match the following. Also, pay attention to the state of matter (solid, liquid, gas)

a)

1.

Pure solid element

b)

2.

Pure gas compound

c)

3.

Pure liquid element

d)

4.

Heterogeneous mixture of a liquid & gas

e)

5.

Homogeneous mixture of 2 gas elements

25.

Match the following

a)

1.

Pure gas compound

b)

2.

Pure gas diatomic element

c)

3.

Homogeneous mixture of liquid elements

d)

4.

Pure gas monotomic element

26.

Which describes a gas at 25oC (room temp)?

a)

Fills it's container

b)

Condenses to a liquid

c)

Has no mass

d)

Moves very slow

27.

How does temperature affect particles?

a)

High temp (speed)

1.

Particles move faster

b)

Low temp (speed)

2.

Particles move slower

c)

High temp (volume)

3.

Volume increases

d)

Low temp (volume)

4.

Volume decreases

28.
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
29.
True or False: Gases can be compressed. 
a)
True
b)
False
30.
What causes pressure?
a)
The walls of the container
b)
The vacuum in the container
c)
The collisions of the particles
d)
Atmospheric pressure acting on the outside walls
31.
If a balloon is cooled what will happen to the volume?
a)
Volume will increase
b)
Volume will decrease
c)
Volume will not change
32.

The heat absorbed while a solid is melting is known as....

a)

heat of fusion

b)

heat of solid

c)

heat of liquid

d)

heat of vaporization

33.

Heat always flows from a __________________ to a cooler object.

a)

warmer

b)

cooler

c)

liquid

d)

gas

34.
Water has a specific heat of 4184 J/KgºC.  Wood has a specific heat of 1760 J/KgºC.  What material needs more energy to raise the temperature 1ºC
a)
Wood
b)
Water
c)
Both are the same
35.

If an unknown sample is at its coldest temperature, the particles will be

a)

far apart

b)

close together

c)

neither

d)

both

36.

A heated substance changes from a solid to a liquid to a gas. During this time, how does the strength of the forces of attraction change among particles?es

a)

the strength of attraction decreases

b)

the strength of attraction increases

c)

the strength of attraction remains the same

d)

none of the above

37.

Match the image to A-B on the heating curve.

a)
b)
c)
38.

Match the image to C-D on the heating curve.

a)
b)
c)
39.

Match the image to E-F on the heating curve.

a)
b)
c)
40.
The specific heat of aluminum is 0.21 cal/g°C.  How much heat(Q) is released when a 10 g piece of aluminum foil is taken out of the oven and cools from 100° to 50°?
a)
105 J
b)
10.5 J
c)
1.05 J
d)
50 J
41.
20 g of water. specific heat of water is 4.18 J/g°C.  temperature changes from 25° C to 20° C, how much heat energy (Q) moves from the water to the surroundings?
a)
418 Joules
b)
209 J
c)
83 J
d)
4.18 J
42.

Which substance has the highest specific heat capacity?

a)

Liquid water

b)

Solid water

c)

Water vapor

d)

Lead

43.

In our coffee cup calorimetry experiment, we dropped a piece of hot metal into cool water. The heat lost by the metal was ___________ the heat gained by the water.

a)

equal to

b)

greater than

c)

less than

44.
How does heat flow?
a)
Always from cold to warm
b)
Always from warm to cold
c)
Both warm to cold & cold to warm
d)
It depends on the temperature
45.
What would be the effect on the particles if more heat is supplied to the system?
a)
They would slow down
b)
They would stop moving
c)
They would speed up
d)
There would be no effect
46.

Which way does energy flow?

a)

Hot to cold

b)

Cold to hot

c)

Cold to Cold

d)

Hot to Hot

47.
What is the equation to measure change in Thermal Energy?
a)
Q=mc∆t
b)
Q=mc
c)
Q= ∆mct
d)
m=QC

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