Latent Heat
Physics ⇒ Heat and Thermodynamics
Latent Heat starts at 8 and continues till grade 12.
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Describe the role of latent heat in the water 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 causes more severe burns than boiling water at 100°C.
Which of the following best defines latent heat? (1) The heat required to raise the temperature of a substance by 1°C (2) The heat required to change the state of a substance without changing its temperature (3) The heat lost to the surroundings during a phase change (4) The heat required to increase the pressure of a gas
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 reflects sunlight (3) The sweat increases body temperature (4) The sweat decreases blood flow
Which of the following is NOT a phase change that involves latent heat? (1) Melting (2) Boiling (3) Heating (4) Condensation
Which of the following is the correct formula for calculating the heat required for a phase change? (1) Q = mcΔT (2) Q = mL (3) Q = PΔV (4) Q = nRT
During boiling, the temperature of water remains constant at 100°C at standard atmospheric pressure. This is because the heat supplied is used for ______.
Fill in the blank: The energy required to change 1 kg of a substance from solid to liquid at its melting point is called its ______.
Fill in the blank: The latent heat of ______ is the energy required to change a substance from gas to liquid at constant temperature.
The latent heat of fusion of water is approximately ______ J/kg.
Is the following statement true or false? 'Latent heat is a form of potential energy.'
Is the latent heat of vaporization of water higher or lower than its latent heat of fusion?
State whether the following is true or false: 'Latent heat is involved in both endothermic and exothermic phase changes.'
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.
