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 8
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 500 g block of ice at 0°C is melted completely. How much heat is required? (Latent heat of fusion of ice = 334,000 J/kg)
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?
Calculate the amount of heat required to melt 2 kg of ice at 0°C. (Latent heat of fusion of ice = 334,000 J/kg)
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.
Explain why steam at 100°C can cause more severe burns than boiling water at 100°C.
Explain why the temperature of a substance does not change during a phase change, even though heat is being added or removed.
Explain why the temperature of boiling water does not rise even though heat is continuously supplied.
The process of changing water to steam at 100°C involves which type of latent heat?
What happens to the particles of a substance when it absorbs latent heat during melting?
What is latent heat?
What is meant by the term 'specific latent heat'?
A 0.4 kg sample of a substance at its boiling point requires 200,000 J to completely change into gas. What is the specific latent heat of vaporization of the substance?
A scientist is investigating the melting of a 3 kg block of a new metal at its melting point. If the specific latent heat of fusion of the metal is 120,000 J/kg, calculate the total energy required to melt the block completely.
During a science experiment, a student observes that when a solid substance is heated at its melting point, its temperature does not increase until all of it has melted. Explain why this happens in terms of latent heat.
