Specific Latent Heat

• What concept is discussed in today's video?

  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 regarding energy?

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

  Temperature remains constant during state change
• What is the term for energy required to change state without temperature change?

  Latent heat
• What is specific latent heat (SLH)?

  Energy to change 1 kg of substance's state
• What are the two types of specific latent heat?

  Latent heat of vaporization and fusion
• 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?

  5,650,000 joules
• What does the equation for specific latent heat state?

  Energy = mass × specific latent heat
• What happens to energy during the melting of ice?

  • Energy is used to break forces between particles
  • 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 forces between particles
  • 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 specific latent heat values differ for heating and cooling?

  • Heating: energy required for state change
  • Cooling: energy released during state change
  • Values are the same but opposite in sign
• What is the significance of the graph showing temperature changes during heating?

  • Shows non-linear temperature changes during state changes
  • Highlights constant temperature during melting and boiling
  • Illustrates energy use for breaking particle bonds