Heat capacity/ Latent heat

• What is heat capacity?

  Energy needed to raise 1kg of substance by 1 Degrees Celsius
• What is the equation for heat energy?

  Heat energy = mass × heat capacity × change in temperature
• What does the Q stand for in the heat energy equation?

  Heat energy
• What does the m stand for in the heat energy equation?

  Mass
• What does the c stand for in the heat energy equation?


  Heat capacity
• What does the delta symbol stand for in the heat energy equation?

  Temperature change
• What unit is heat energy?

  Joules
• What unit is mass?

  Kilograms
• What unit is heat capacity?

  Joules/Kilograms/Degreess Celsius
• What unit is temperate change?

  Degrees Celsius
• Calculate the energy used to raise 200g of water from 24 degrees Celsius to 50 degrees Celsius? (Heat capacity of water is 4200)

  First find the temperature change.

  50 - 24 = 26

  Convert mass to kg

  200 ÷ 1000 = 0.2

  Use the equation

  Heat energy = 0.2 × 4200 × 26 = 21,840J
• As temperature is increased internal energy of the substance increases because the particles kinetic energy increases.
• What is the equation for Specific latent heat?

  Energy = mass × latent heat
• What is latent heat?

  The energy to change 1kg of a substance state.