specific latent heat

• What is meant by 'specific latent heat'?

  energy needed for a 1kg substance to change a state without a change in temperature.
• What happens when a substance is condensing/freezing?

  bonds are forming between particles, which releases energy. This means the internal energy decreases, but the temperature doesn't go down until all the substance has turned to liquid or solid.
• What is the energy needed to change the state of a substance?

  latent heat
• What is the specific latent heat for changing between a solid or liquid? (melting/freezing)

  specific latent heat of fusion.
• What is the specific latent heat for changing between a liquid & gas? (evaporating, boiling or condensing)

  specific latent heat of vaporisation.
• What is the formula for specific latent heat?

  Energy (J) = Mass (Kg) × Specific Latent Heat (J/Kg) OR: E = mL
• What is meant by 'internal energy'?

  the total amount of kinetic energy & potential energy of all the particles in the system.
• What is one mega joule equal to in joules?

  1,000,000 joules