Energy: Specific Heat Capacity

Question 1

What is specific heat capacity?

Answer 1

Specific heat capacity is **the amount of energy required to raise the temperature of 1kg of a substance by 1^oC

Question 2

Calculate the energy required to increase the temperature of 2kg of water from 20^oC to 100^oC.
The specific heat capacity of water is 4200J/kg^oC.

Answer 2

2 x 4200 x 80 = change in thermal energy
= 672 kJ / 672, 000 J

Question 3

What is the formula for the change in thermal energy?

Answer 3

△E = m x c x △θ

(change in thermal energy (J) =mass (kg) x specific heat capacity (J/kg^oC) x change in temperature (^oC))

Question 4

A gold ring (specific heat capacity of gold: 130 J/kg^o) is heated by supplying the 1000J of thermal energy to raise its temperature from 25ºC to 100ºC. Calculate the mass of the ring

Answer 4

0.10kg / 100g