Latent Heat
Physics ⇒ Heat and Thermodynamics
Latent Heat starts at 8 and continues till grade 12.
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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 change of state.
Describe what is meant by 'hidden heat' in the context of latent heat.
Explain why ice at 0°C is more effective in cooling than water at 0°C.
A 0.2 kg sample of a substance requires 44,800 J to vaporize at its boiling point. What is its specific latent heat of vaporization?
A 1.5 kg block of ice at 0°C is melted. How much heat is required? (Latent heat of fusion = 334,000 J/kg)
A 250 g sample of a substance requires 83,500 J to melt at its melting point. What is its specific latent heat of fusion?
A student heats 1 kg of water at 100°C until it all turns to steam at 100°C. If the latent heat of vaporization is 2,260,000 J/kg, how much heat is needed?
Latent heat is absorbed or released during which of the following processes?
(1) Change in temperature
(2) Change in state
(3) Change in pressure
(4) Change in volume
Which of the following best describes the latent heat of vaporization?
(1) Heat needed to freeze a liquid
(2) Heat needed to boil a liquid
(3) Heat needed to melt a solid
(4) Heat needed to cool a gas
Which of the following best explains why sweating cools the body?
(1) Sweat absorbs heat as it evaporates, using latent heat of vaporization
(2) Sweat reflects sunlight
(3) Sweat increases body temperature
(4) Sweat blocks pores
Which of the following equations is used to calculate the heat required for a change of state?
(1) Q = mcΔT
(2) Q = mL
(3) Q = P × t
(4) Q = V × I
Fill in the blank: During condensation, latent heat is ______ by the substance.
Fill in the blank: During freezing, a substance ______ latent heat to its surroundings.
Fill in the blank: The amount of heat required to convert 1 kg of ice at 0°C to 1 kg of water at 0°C is called the ______ of fusion of ice.
Fill in the blank: The energy required to change 1 kg of a substance from solid to liquid at constant temperature is called ______.
True or False: Latent heat is measured in joules (J).
True or False: The latent heat of fusion is always less than the latent heat of vaporization for the same substance.
True or False: The latent heat of fusion of a substance is the same as its latent heat of vaporization.
True or False: The specific latent heat of a substance depends on its mass.
