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 11
A 0.2 kg sample of a substance at its melting point requires 30,000 J to melt completely. What is the latent heat of fusion?
A 0.3 kg sample of a substance at its boiling point requires 90,000 J to vaporize completely. What is its latent heat of vaporization?
A 0.5 kg sample of water at 100°C is converted to steam at 100°C. How much heat is required? (Latent heat of vaporization of water = 2,260,000 J/kg)
A 1 kg sample of a substance at its boiling point absorbs 500,000 J of heat and completely vaporizes. What is its latent heat of vaporization?
A 100 g sample of a substance at its melting point absorbs 25,000 J of heat to melt completely. What is its latent heat of fusion?
A 2 kg block of ice at 0°C is melted completely to water at 0°C. How much heat is required? (Latent heat of fusion of ice = 334,000 J/kg)
A 250 g sample of a substance requires 50,000 J to change from solid to liquid at its melting point. What is its latent heat of fusion?
Calculate the amount of heat required to convert 500 g of ice at 0°C to water at 0°C. (Latent heat of fusion of ice = 334,000 J/kg)
Describe what happens to the energy supplied to a substance during its boiling process.
Describe what happens to the temperature of a substance as it undergoes a phase change at constant pressure.
Explain the difference between latent heat of fusion and latent heat of vaporization.
Explain why sweating cools the body in terms of latent heat.
Explain why the temperature of ice does not rise above 0°C until all the ice has melted, even if heat is continuously supplied.
If 100 g of steam at 100°C is condensed to water at 100°C, how much heat is released? (Latent heat of vaporization of water = 2,260,000 J/kg)
What is latent heat?
