Specific Heat Capacity

Question 1

How do you calculate specific heat capacity?

Answer 1

E=M✖️C✖️➰
C = E➗M✖️➰
E= energy transfer 
M= mass
C= specific heat capacity 
➰= temperature change

Question 2

What is specific heat capacity?

Answer 2

Amount of energy in Joules needed to raise the temperature of 1kg of a substance by 1C
Units = J/kg/C

Question 3

What is the specific heat capacity of water?

Answer 3

4200 J/kg/C

Question 4

What is the specific heat capacity of copper?

Answer 4

390J/kg/C

Question 5

What is the specific heat capacity of aluminium?

Answer 5

900 J/kg/C

Question 6

What is the specific heat capacity of brass?

Answer 6

380 J/kg/C

Question 7

What is the specific heat capacity of steel/iron?

Answer 7

460 J/kg/C

Question 8

Which of those metals would require most heat energy to raise 1kg of the material from 20c to 40c

Answer 8

Aluminium because it has the highest heat capacity

Question 9

How much energy is required to raise the temperature of 2kg of brass from 20c to 30c

Answer 9

E=2x380x10=7600J

Question 10

10kg of water is at 10c. How much heat will be required to raise its temperature to 60c?

Answer 10

E=10x4200x50=2100000J

Question 11

3600J of heat energy are supplied to 2kg of aluminium.
What is the temperature rise of the block?
If the aluminium starts at 22c what is its final temperature?

Answer 11

➰=3600➗2x900=2c

Final temperature=22+2=24c

Question 12

A water immersion heater supplies 840,000J of heat to an insulated tank of water.
If the temperature of the tank rises from 15c to 55c what mass of water is in the tank

Answer 12

M=840,000➗4200x40=5kg

Question 13

A new metal alloy is tested and 4kg which starts at 18c is raised to 43c when 60kJ of thermal energy is supplied.
What is the specific heat capacity of this alloy?

Answer 13

C=60000➗(4x25)=600J/kg/C

Question 14

What is the specific heat capacity of air?

Answer 14

1000 J/kg/C

Question 15

What is the specific heat capacity of ethanol?

Answer 15

2400 J/Kg/C

Question 16

What is the specific heat capacity of rubber?

Answer 16

2000 J/Kg/C

Question 17

A small bucket and a large bucket are left in strong sunlight. Which one will warm up faster? Give a reason?

Answer 17

The large bucket contains more water so needs to gain more internal energy to heat up

Question 18

Why does a mass of lead heat up more quickly than an equal mass of aluminium?

Answer 18

Lead has specific heat capacity of 130 and aluminium is 900

So lead needs less energy to rise its temperature