Specific Heat Capacity

Question 1

what is the definition of specific heat capacity?

Answer 1

the SHC of a substance is the amount of energy required to raise the temperature of 1kg of a substance by 1*C

Question 2

what is the formula for energy change (SHC)?

Answer 2

energy change = m (mass) x c (SHC, J/kgC) x temperature change (C)

Question 3

an iron has an aluminium plate with a mass of 1.5kg. calculate the thermal energy store in the plate when the temperature rises from 20C to 200C. specific heat capacity = 913J/kg*C

Answer 3

energy change = 1.5 x 913 x 180 = 246,510J / 1000 = 246.51kJ

Question 4

a hot water bottle cools down from 80C to 20C, releasing 756,000J of thermal energy. calculate the mass of the water. specific heat capacity = 4200J/kg*C

Answer 4

energy change = m x c x temp change
/ c x temp change
mass = energy change / c x temp change
= 756,000 / 4200 x 60 = 3kg