specific latent heat

• What happens to particles as a substance is heated?

  Particles gain energy in their kinetic energy store
• How does temperature relate to internal energy?

  Temperature measures average internal energy of particles
• What occurs during a change in state when heating a substance?

  Energy weakens or breaks forces between particles
• What happens to temperature during a state change?

  Temperature remains constant during state change
• What is latent heat?

  Energy required to change state without temperature change
• What is specific latent heat (SLH)?

  Energy required to change 1 kg of substance's state
• What is the specific latent heat of fusion for water?

  334,000 joules per kilo
• What is the specific latent heat of vaporization for water?

  2,260,000 joules per kilo
• How much energy is required to boil 2.5 kg of water at 100 degrees Celsius?

  5,650,000 joules
• What happens to energy during the melting of ice?

  • Energy is used to break particle bonds
  • Temperature remains constant during melting
  • Specific latent heat of fusion is applied
• What happens to energy during the boiling of water?

  • Energy is used to break bonds in liquid
  • Temperature remains constant during boiling
  • Specific latent heat of vaporization is applied
• How does cooling affect the energy of a substance during state change?


  • Energy is released when forming new bonds
  • Temperature remains constant during cooling
  • Specific latent heat values are reversed
• How do you calculate energy required for state change?

  • Use the formula: Energy = mass × specific latent heat
  • Substitute mass and specific latent heat values
  • Solve for energy