SLH

• What concept is the focus of today's video?

  The concept of specific latent heat
• What happens to the particles of a substance as it is heated?

  The particles gain energy in their kinetic energy store, increasing their internal energy
• How is temperature related to the internal energy of particles in a substance?

  Temperature is a measure of the average internal energy of all the particles in a substance
• What occurs during a change in state when heating a substance?

  The energy provided is used to weaken or break the forces holding the particles together
• What happens to the temperature of a substance during a state change?

  The overall temperature remains constant until all of the substance has changed states
• How does cooling a substance involve a change in state?

  It involves the formation of new bonds between particles, which releases energy
• What is the term for the energy required to change the state of a substance while the temperature remains the same?

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

  SLH is the energy required to change one kilo of a substance from one state to another without changing its temperature
• What are the two types of specific latent heat?

  Specific latent heat of vaporization and specific latent heat of fusion
• What does the specific latent heat of vaporization refer to?

  The energy change when a substance changes between a liquid and a gas
• What does the specific latent heat of fusion refer to?

  The energy change when a substance changes between a solid and a liquid
• If you heat one kilo of ice from -50 degrees Celsius to 150 degrees Celsius, what happens at 0 degrees Celsius?

  The ice starts to melt, and the temperature remains constant during this process
• What is the specific latent heat of fusion for water?

  334,000 joules per kilo
• What happens when all the ice has melted into liquid water?

  The temperature of the water continues to increase until it reaches 100 degrees Celsius
• What is the specific latent heat of vaporization for water?

  2,260,000 joules per kilo
• What happens after all the water has boiled into water vapor?

  The temperature continues to increase like normal
• What happens to the specific latent heat values when cooling water?

  The specific latent heat values refer to the amounts of energy released rather than required
• What is the equation for specific latent heat?

  The energy required or released is equal to the mass of the substance times the specific latent heat
• How would you calculate the energy required to completely boil 2.5 kilos of water at 100 degrees Celsius?

  By multiplying 2.5 by 2,260,000 joules
• What is the result of boiling 2.5 kilos of water using the specific latent heat of vaporization?

  5,650,000 joules or 5,650 kilojoules
• What are the key concepts of specific latent heat?

  • Energy required to change state without changing temperature
  • Depends on the type and amount of substance
  • Two types: vaporization and fusion
• What is the difference between specific latent heat of vaporization and fusion?

  • Vaporization: energy change between liquid and gas
  • Fusion: energy change between solid and liquid