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Thermochemistry

Total questions: 34

Worksheet time: 46mins

Name
Class
Date
1.

This measures the average kinetic energy of molecules

a)

temperature

b)

heat

c)

Kevin

d)

Carbon dioxice

2.

Device used to measure temperature

a)

thermometer

b)

electronic balance

c)

pH meter

d)

graduated cylinder

3.

Observe the diagram. Which statement is true about the kinetic energy of the molecules in the containers?

a)

The molecules are moving faster in Diagram A

b)

The molecules are moving slower in Diagram A

c)

The molecules are moving at the same rate in both diagrams

4.
To turn a liquid into a gas, you _____ energy.
a)
Add
b)
Remove
5.
When you touch something that feels cold, 
a)
heat from your hand moves into the cold substance.
b)
coldness moves from the cold substance into your hand.
c)
it melts.
d)
it freezes.
6.

Heat loss causes matter to ________. Heat gain causes matter to ________.

a)

contract ; expand

b)

expand ; contract

c)

stay ; change

d)

change ; stay

7.
What is the transfer of heat by movement of liquids or gases?
a)
Radiation
b)
Convection
c)
Conduction
d)
Heat
8.
What are waves that can transfer heat through the vacuum of empty space?
a)

Radiation

b)
Convection
c)
Conduction
d)
Heat
9.
What is the transfer of heat by direct contact?
a)
Convection
b)
Electromagnetic waves
c)
Radiation
d)
Conduction
10.

Curling Iron

a)

Conduction

b)

Convection

c)

Radiation

11.

Sun Bathing

a)

Conduction

b)

Convection

c)

Radiation

12.

Which of the following is an example of an endothermic process or reaction?

a)

condensing

b)

freezing

c)

combustion

d)

melting

13.

Which of the following is an example of an exothermic process or reaction?

a)

melting

b)

boiling

c)

photosynthesis

d)

freezing

14.

What type of system is this/

a)

open

b)

closed

c)

isolated

15.

What type of system is this

a)

open

b)

closed

c)

isolated

16.

what type of system is this

a)

open

b)

closed

c)

isolated

17.

the exchange of mass and energy is what type of system?

a)

open

b)

closed

c)

isolated

18.

The exchange of energy but not mass is what type of system

a)

open

b)

closed

c)

isolated

19.

What is the phase change of a solid to a liquid?

a)

freezing

b)

melting

c)

boiling

d)

condensation

20.

What is it called when a solid turns directly into a gas?

a)
Sublimation
b)
Condensation
c)
Liquid
21.

All phase changes (changing states) requires energy to be added or taken away.

a)
True
b)
False
22.
Change from Gas to Solid is called........
a)
Sublimation
b)
Deposition
c)
Fusion
d)
condensation
23.

Change from Liquid to Solid is called ...

a)

fusion

b)

Freezing

c)

sublimation

d)

evaporation

24.
Change from gas to liquid...
a)
condensation
b)
evaporation
c)
expansion
d)
movement
25.

Change from liquid to gas is called....

a)

expansion

b)

evaporation

c)

condensation

d)

sublimation

26.

What happens along the AC line?

a)

Melting/Freezing

b)

Boiling/Condensing

c)

Boiling/melting

d)

freezing/condensing

27.

What is the normal boiling point?

a)

0 οC

b)

< 0 οC

c)

100 οC

d)

> 100 οC

28.
In which region(s) does temperature remain constant?
a)
Region 1, 3, & 5
b)
Region 2 & 4
c)
Region 1 only
d)
Region 1 & 2
29.

Describe the substance at letter A.

a)

Solid

b)

Liquid

c)

Melting

d)

Evaporating

30.
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

31.

How much energy is required to completely boil away 150g water?

a)
56,484 J
b)
339,000 J
c)
395,484 J
d)
385,484 J
32.

If a 8.50g ice cube at -10.0o C sits out on the counter, completely melts, and then warms to room temperature (25.0 o C) how much energy did the ice cube absorb?

a)

177 J

b)

1070 J

c)

888 J

d)

3905 J

33.
A high specific heat means...
a)
It heats up quickly with energy added
b)
It requires more energy to change temperature
34.

Which of the following best explains why the sand at the beach is hotter than the water?

a)

Sand has a higher specific heat than water.

b)

Sand has a lower specific heat than water.

c)

There is more water than sand at the beach.

d)

There is more sand than water at the beach.

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