specific latent heat

• What is specific latent heat?

  Energy required to change state without temperature change
• What happens to temperature when a substance changes state?

  Temperature remains constant during the change
• What is the specific latent heat of fusion for ice?

  334,000 joules per kilogram
• What does the specific latent heat of fusion refer to?

  Energy to change solid to liquid without temperature change
• What is the specific latent heat of vaporization for ethanol?

  846,000 joules per kilogram
• What does the specific latent heat of vaporization refer to?

  Energy to change liquid to vapor without temperature change
• How do you calculate the energy change during a state change?

  Energy = mass × specific latent heat
• What is the formula for energy change during a state change?

  Energy = mass × specific latent heat
• What is the energy required to convert 0.5 kg of ice to liquid water?

  167,000 joules
• How do you calculate the energy for 0.15 kg of ethanol to vaporize?

  Energy = 126,900 joules
• What are the key definitions of specific latent heat?

  • Specific latent heat of fusion: Energy to change 1 kg solid to liquid
  • Specific latent heat of vaporization: Energy to change 1 kg liquid to vapor
• What is the process to calculate energy change during a state change?

  1. Identify mass in kilograms
  2. Identify specific latent heat in joules per kilogram
  3. Use formula: Energy = mass × specific latent heat
• What are the differences between latent heat of fusion and vaporization?

  • Fusion: Solid to liquid
  • Vaporization: Liquid to gas
  • Both require energy without temperature change