Latent Heat
Physics ⇒ Heat and Thermodynamics
Latent Heat starts at 8 and continues till grade 12.
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See sample questions for grade 10
Define the term 'specific latent heat'.
Describe the role of latent heat in the refrigeration cycle.
Describe what happens to the temperature of a substance during a phase change when latent heat is supplied.
Explain the difference between latent heat of fusion and latent heat of vaporization.
Explain why steam at 100°C can cause more severe burns than boiling water at 100°C.
Explain why the temperature of boiling water does not rise above 100°C at standard atmospheric pressure.
A 0.25 kg block of ice at 0°C is melted and then heated to 50°C. How much heat is required for the melting process only? (Latent heat of fusion of ice = 334,000 J/kg)
A student heats 250 g of ice at 0°C until it melts completely. How much energy is absorbed? (Latent heat of fusion of ice = 334,000 J/kg)
Which of the following best describes the latent heat of fusion?
(1) Heat required to raise the temperature of a solid
(2) Heat required to change a solid into a liquid at constant temperature
(3) Heat required to change a gas into a liquid
(4) Heat required to raise the temperature of a liquid
Which of the following best describes what happens during condensation?
(1) Latent heat is absorbed
(2) Latent heat is released
(3) Temperature increases
(4) No heat is involved
Which of the following best explains why sweating cools the body?
(1) The sweat absorbs heat as it evaporates, using the latent heat of vaporization
(2) The sweat increases body temperature
(3) The sweat blocks sunlight
(4) The sweat reflects heat
Which of the following is NOT a phase change involving latent heat?
(1) Melting
(2) Boiling
(3) Heating
(4) Condensation
Fill in the blank: The energy required to change 1 kg of a substance from liquid to gas at constant temperature is called its ______.
Fill in the blank: The energy required to change 1 kg of a substance from solid to liquid at constant temperature is called its ______.
Fill in the blank: The formula to calculate the heat required for a phase change is Q = m × ______.
Fill in the blank: The latent heat of fusion of ice is ______ J/kg.
Is the following statement true or false? 'Latent heat is only involved in the melting and boiling of water.'
Is the following statement true or false? 'Latent heat is required to change the temperature of a substance.'
Is the latent heat of vaporization generally higher than the latent heat of fusion for the same substance?
True or False: During the melting of ice at 0°C, the temperature of the ice-water mixture remains constant until all the ice has melted.
