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Calorimetry

Total questions: 10

Worksheet time: 13mins

Name
Class
Date
1.
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
2.

If the specific heat of water is 4.18 J/g∙°C, how much heat is required to increase the temperature of 1.2 kg of water from 23 °C to 39 °C?

a)

-80,256 J

b)

+80.256 J

c)

+80,256 J

d)

-80.256 J

3.

A sample of iron receives 50.J of heat energy that raises the temperature of the iron by 25.0°C. If iron has a specific heat of 0.10 J/g°C, what is the mass of the iron sample?

a)

25g

b)

30g

c)

20g

d)

50g

4.
A reaction is performed in a beaker with a temperature probe recording the temperature changes of the reaction.  If the temperature began at 15.0 degrees Celsius and ended at 27.5 degrees Celsius. Is the reaction endothermic or exothermic?
a)
Exothermic
b)
Endothermic
5.
What is a tool that measures the heat of chemical reactions?
a)
calorimeter
b)
 calorie
c)
Styrofoam™ cup
d)
none of these
6.
Calorimeters use insulating materials to:
a)
encourage affordable materials in science experiments in schools.
b)
preserve the heat of the environment outside the Styrofoam cup.
c)
prevent heat from escaping to the environment.
d)
keep the liquid inside the Styrofoam cup from overheating.
7.

What does "ΔT" mean?

a)

A change in time

b)

A change in heat

c)

A change in energy

d)

A change in temperature

8.

The specific heat of water is 4.18 J/g°C.

If 980. J of energy is added to 6.20 g of water at 18.0 °C, what is the final temperature of the water?

a)

37.8 °C

b)

-19.8 °C

c)

19.8 °C

d)

55.8 °C

9.

A calorimeter is made of copper because

a)

copper is a good conductor of heat

b)

copper has high specific heat capacity

c)

copper has low specific heat capacity

d)

Both option 3 and 1

10.

An iron ball requires 5000 J heat energy to raise its temperature by 100C. Calculate the heat capacity of the iron ball.

a)

5 JK-1

b)

50 JK-1

c)

500 JK-1

d)

5000 JK-1