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 9
A student heats a beaker of ice at 0°C. The temperature does not rise until all the ice melts. What is the reason for this observation?
Describe the difference between latent heat of fusion and latent heat of vaporization.
Describe what happens to the energy supplied to a substance during a phase change.
Describe what happens to the temperature of a substance during freezing.
Explain why frost forms on a cold surface even when the air temperature is above the freezing point of water.
Explain why steam at 100°C can cause more severe burns than boiling water at 100°C.
A student heats a beaker of ice at 0°C. The temperature does not rise until all the ice melts. What is the reason for this observation?
Explain why frost forms on a cold surface even when the air temperature is above the freezing point of water.
Which of the following best describes latent heat? (1) Heat required to raise the temperature of a substance, (2) Heat required to change the state of a substance, (3) Heat lost to the surroundings, (4) Heat that is not measurable.
Which of the following best explains why sweating cools the body? (1) The sweat absorbs heat as it evaporates, (2) The sweat reflects sunlight, (3) The sweat increases body temperature, (4) The sweat blocks pores.
Which of the following is an example of latent heat in everyday life? (1) Boiling water, (2) Heating a metal rod, (3) Cooling a room with a fan, (4) Turning on a light bulb.
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 amount of heat required to change 1 kg of a substance from solid to liquid at constant temperature is called the ______ latent heat of fusion.
Fill in the blank: The energy required to change 1 kg of a liquid into gas at its boiling point is called the ______ latent heat of vaporization.
Fill in the blank: The formula to calculate the heat required for a phase change is Q = m × ______, where m is mass and ______ is the specific latent heat.
Fill in the blank: The latent heat of ______ is the heat required to change a liquid into a gas at its boiling point.
True or False: During the melting of ice, the temperature of the ice-water mixture remains constant until all the ice has melted.
True or False: Latent heat is only involved during heating, not cooling processes.
True or False: The latent heat of fusion for water is 334 J/g.
True or False: The latent heat of fusion is the same for melting and freezing of a substance.
