3.2.3 Specific Latent Heat

• Specific latent heat is the amount of energy required to change the state of a substance without changing its temperature
• Specific latent heat of vaporization is the energy required to change a substance from liquid to gas state without changing temperature
• Match the type of specific latent heat with its definition:

  Specific latent heat of fusion ↔️ Energy required to change solid to liquid

  Specific latent heat of vaporization ↔️ Energy required to change liquid to gas
• In the formula $Q =$$mL$, Q represents the energy required in Joules
• In the formula $Q =$$mL$, L represents the specific latent heat in J/kg
• The latent heat of vaporization is the energy required to change a substance from liquid to gas state
• Melting requires the absorption of specific latent heat of fusion to change a substance from solid to liquid

  True
• In freezing, energy is transferred from the substance to its surroundings


  True
• Match the type of specific latent heat with its definition:

  Specific latent heat of fusion ↔️ Solid to liquid

  Specific latent heat of vaporization ↔️ Liquid to gas
• The formula for calculating specific latent heat is $Q =$$mL$.
• Latent heat of fusion involves melting and freezing.

  True
• During freezing, a liquid releases specific latent heat of fusion to form the solid phase.


  True
• Match the process with its energy flow:

  Boiling ↔️ From surroundings to substance

  Condensation ↔️ From substance to surroundings
• How much energy is needed to melt 2 kg of ice at 0°C, given the specific latent heat of fusion of ice is $3.34 × 10^{5}$ J/kg? The answer is $6.68 × 10^{5}$ J.
• Specific latent heat of fusion is the energy required to change a substance from solid to liquid state without changing temperature


  True
• The formula for calculating specific latent heat is $Q =$$mL$


  True
• In the formula $Q =$$mL$, m represents the mass of the substance in kilograms


  True
• The latent heat of fusion is the energy required to change a substance from solid to liquid state


  True
• Arrange the direction of energy transfer during melting and freezing:

  1️⃣ During melting, energy moves from the surroundings to the substance

  2️⃣ During freezing, energy moves from the substance to the surroundings
• Freezing requires the release of specific latent heat of fusion
• Specific latent heat is the energy required to change the state of a substance without changing its temperature.
• The specific latent heat of fusion is the energy required to change a substance from solid to liquid without changing its temperature.


  True
• Match the type of specific latent heat with its state change:

  Fusion ↔️ Solid to liquid

  Vaporization ↔️ Liquid to gas
• During melting, a solid absorbs specific latent heat of fusion from the surroundings.
• During condensation, a gas releases specific latent heat of vaporization to become a liquid.
• Order the steps to solve a numerical problem related to specific latent heat:

  1️⃣ Identify the type of phase change

  2️⃣ Note the given values

  3️⃣ Choose the correct formula

  4️⃣ Substitute the values

  5️⃣ Calculate the energy required
• When solving numerical problems related to specific latent heat, it is necessary to convert all units to SI units.

  True