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Thermochemistry Review

Total questions: 50

Worksheet time: 1hrs 2mins

Name
Class
Date
1.
What type of heat transfer is a beaker on a hot plant an example of?
a)
Conduction
b)
Covection
c)
Radiation
d)
Chemical
2.

If the enthalpy (ΔH) is negative the reaction is ____.

a)

Endothermic

b)

Exothermic

c)

Neutral

3.
H2 + ½ O2 --> H2O + 285kJ is an example of a(n)
a)
Electrical equation
b)
Heat equation
c)
Thermochemical equation
4.
If ΔH is positive, heat would be shown on the _____ side of the thermochemical equation.
a)
Reactant
b)
Product
5.
How can you convert Kelvin to Celcius?
a)
add 273
b)
subtract 273
c)
multiply by 273
d)
divide by 273
6.
How much heat does an aluminum block absorb if 10.00 grams ae heated from 25.0oC to 50.0oC? the specific heat of aluminum is .900J/goC
a)
450
b)
-450
c)
225
d)
-225
7.
The diagram represents which type of reaction
a)
endothermic
b)
exothermic
8.
Durning a phase change the temperature of a substance_________.
a)
always increases
b)
always decreases
c)
always stays the same
d)
varies
9.
A 24.0 gram sample of copper was heated from 25.0oC to 500.0oC, 4378J of heat were absorbed, what is the specific heat of copper?
a)
.384
b)
49909200
c)
2.60
d)
8.77
10.
When you dropped a hot metal sample into room temperature water in the lab what happened?
a)
the heat from the metal traveled into the water
b)
the cool from the water traveled into the hot metal
c)
both of the other answers are correct
11.
A measure of the average kinetic energy of a substance.
a)
heat
b)
temperature
c)
enthalpy
d)
entropy
12.
A sample of iron receives 50.J of heat energy that raises the temperature of the iron 25.0°C. If iron has a specific heat of .10 J/g°C, what is the mass of the iron sample?
a)
25g
b)
30g
c)
20g
d)
50g
13.
What letter represents boiling?
a)
B
b)
C
c)
D
d)
E
14.
What letter represents a liquid being heated?
a)
A
b)
B
c)
C
d)
D
15.
How much energy does it take to freeze 39.2 g of liquid benzene (C6H6)?  (ΔHfus = 9.08 kJ/mol, ΔHvap = 28.4 kJ/mol)  (Show your work)
a)
4.940 kJ
b)
-4.940 kJ
c)
258 kJ
d)
-258 kJ
16.
What change occurs from C to D?
a)
condensation
b)
vaporization
c)
melting
d)
sublimation
17.

At 40 atm, dry ice is heated from -100 °C to 30 °C. What changes occur?

a)

freezing, then condensation

b)

melting only

c)

sublimation only

d)

melting, then boiling

18.

Heat of Fusion can be applied to what phase change?

a)

condensation

b)

vaporization

c)

sublimation

d)

melting

19.

A release of energy occurs during which change of phase?

a)

solid to liquid

b)

liquid to gas

c)

gas to liquid

d)

solid to gas

20.

Which phase change represents sublimation?

a)

solid to liquid

b)

liquid to gas

c)

gas to solid

d)

solid to gas

21.

Which of the following represents when a gas turns directly to a solid?

a)

decomposition

b)

deposition

c)

sublimation

d)

crystallization

22.

Which of the following lists provide three exothermic processes?

a)

melting, freezing, and vaporizing

b)

melting, subliming, and vaporizing

c)

condensing, deposition and freezing

d)

condensation, deposition and sublimation

23.

The amount of heat needed to raise the temperature of 1 gram of a substance by 1 C degree is called

a)

heat of fusion

b)

heat of vaporization

c)

specific heat

d)

change in temperature

24.

delta T is calculated by

a)

Ti - Tf

b)

Tf - Ti

25.

Which of the following is NOT a unit of heat?

a)

joules

b)

calories

c)

degrees Celsius

d)

All are units of heat.

26.

Which would contain more heat energy?

a)

a swimming pool at room temperature

b)

a bucket of boiling water

27.

How much ammonia (NH3) can be melted by the addition of 2 kJ of heat (ΔHfus = 5.66 kJ/mol)

a)

.66 g

b)

3.6 g

c)

79.2 g

d)

6.0 g

28.

The symbol for specific heat is .......

a)

C

b)

q

c)

m

d)

T

29.
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
30.

Which picture shows the correct flow of energy?

a)
b)
c)
d)

They are all Correct

31.

Which law of nature states that energy can only be transformed from one type to another?

a)

Law of Conservation of Matter

b)

Law of Conservation of Mass

c)

Law of Cosigns

d)

Law of Conservation of Energy

32.

On this heating curve of water, point B is known as:

a)

zero point

b)

melting point

c)

boiling point

d)

point of no return

33.

On this heating curve of water, point D is known as:

a)

boiling point

b)

freezing point

c)

melting point

d)

solid/liquid transition

34.

What states of matter exist between points D and E?

a)

gas and plasma

b)

only liquid

c)

liquid and solid

d)

liquid and gas

35.

What state(s) of matter exist between C and D?

a)

liquid and gas

b)

solid and liquid

c)

only liquid

d)

solid and gas (sublimation)

36.
What is the freezing point for this substance?
a)
60 °C
b)
40 °C
c)
80 °C
d)
100 °C
37.
For the formula:
 Q= m c ∆T
The  units for specific heat are:
a)
g /J C
b)
°C/g J
c)
kJ/g
d)
J/g°C
38.
.
.
.
.
.
.
What letter represents a gas being cooled?
a)
B
b)
C
c)
D
d)
E
39.
What kind of energy is in a moving skateboard?
a)
Potential
b)
Kinetic
40.

What kind of energy is in gasoline in a car tank (car is not on)?

a)

Chemical Potential energy

b)

Chemical Kinetic energy

41.
H2 + 2 C + N2 + 270.3 kJ --> 2 HCN
Is this reaction endothermic or exothermic?
a)
Endothermic 
b)
Exothermic
42.
What kind of reaction is this?
a)

endothermic

b)
exothermic
43.
Phase change from gas to liquid 
a)
sublimation
b)
condensation
c)
vaporization
d)
freezing
44.
Device that accurately measures energy changes during a chemical process.
a)
thermometer
b)
calorimeter
c)
barometer
d)
anemometer
45.
Heat transfer through direct contact
a)
conduction
b)
convection
c)
radiation
d)
thermal
46.
Heat transfer through liquids or gases
a)
conduction
b)
convection
c)
radiation
d)
thermal
47.
What type of heat transfer is shown in this picture?
a)
radiation
b)
convection
c)
conduction
d)
solar
48.
What type of heat transfer is shown in the picture?
a)
radiation
b)
conduction
c)
convection
49.
The movement of thermal energy from one thing to another.
a)
Heat transfer
b)
Potential energy
c)
Law of conservation
d)
Specific heat
50.
Energy can neither be created nor destroyed; only transformed from one form to another.
a)
First Law of Thermodynamics
b)
Second Law of Thermodynamics
c)
Third Law of Thermodynamics
d)
Law of Conservation of Matter

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