Specific Latent Heat (OCR GCSE Physics A, Combined (Gateway Science Suite)): Quizzes

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Specific Latent Heat
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What mass of substance does specific latent heat refer to?

1 kg

What happens to temperature during a change of state?

It stays constant

Which type of latent heat is needed to melt a substance?

Specific latent heat of fusion

Which latent heat is involved when a liquid boils?

Specific latent heat of vaporisation

What is the formula for energy needed for a change of state?

E=mLE = mL

What are the units of energy (EE) in the formula E=mLE = mL?

Joules (J)

What are the units of mass (mm) in the formula E=mLE = mL?

Kilograms (kg)

What are the units of specific latent heat (LL)?

Joules per kilogram (J/kg)

What must happen before a substance can change state?

It must be at the right temperature

Calculate energy needed to melt 2 kg if L=5000L = 5000 J/kg. Use E=mLE = mL.

10000 J

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