Specific Heat Capacity and Latent Heat Questions - GCSE standard
Q1. An electrical immersion heater supplies heat at a steady rate to 2.5 kg of water at 20°C in a container of thermal capacity 1500 J/K and it is noticed that in 8.0 minutes the temperature of the water rose to 100°C.
After another hour, the water was just boiled away.
(Total 8 marks)
Q2. An electric kettle of thermal capacity 820 J/K contains 0.90 kg of water.
If it takes 9.0 min to raise the temperature of the kettle and its contents from 19°C to 100°C, how much longer should it take to boil away half the water?
(Specific heat capacity of water = 4200 J/kg K
Latent heat of vaporisation of water = 2.3 x 106 J/kg)