Latent Heat and Specific Heat Capacity

The specific latent heat required to melt aluminium is 9130 kJ/kg. Find the quantity of latent heat required to melt 4 kg of aluminium at 660°C

• 24,103,200J or 24.1032MJ

• 36,520J or 36.52kJ

• 36,520,000J or 36.52MJ

• 6025800J or 6.0258MJ

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What happens to the temperature of a substance when it absorbs heat energy?

• It decreases

• It remains the same

• It increases

• It fluctuates

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Why are lines B and D flat?

• The ice is melting

• The ice is freezing

• All of the thermal energy is used to break the bonds

• They stopped the stopwatch

• They stopped heating the ice.

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A substance with a HIGH specific heat capacity:

• Take a long time to heat up and cool down

• Never freezes

• Takes a short time to heat up and cool down

• Is always a solid

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The Latent Heat of Fusion best describes what phase change? 

• between a solid and a liquid 

• between plasma 

• between a liquid and a gas

• between a gas

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The latent heat of vaporization is the amount of heat needed to cause a phase change between a:

• solid and a liquid

• liquid and a gas

• plasma and a gas

• liquid and plasma

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The amount of heat which is used to change the state of matter not for increase the temperature is called

• Latent heat

• Specific heat

• Heat capacity

• None of the above.

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Latent heat of fusion is amount of

• heat energy required to change 1 kg solid into liquid completely at its melting point.

• heat energy required to convert 1 kg solid into liquid at room temperature

• heat energy required to change 1 g of solid into liquid completely

• heat energy required to change 1 kg of solid into liquid at any temperature.

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When heat is constantly supplied by a burner to boiling water, then the temperature of water during vapourisation

• Rises very slowly

• Rises rapidly until steam is produced

• First rises and then becomes constant

• Does not rise at all

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When water at 0°C freezes to form ice at the same temperature of 0°C, then it

• Absorbs some heat

• Releases some heat

• Neither absorbs nor releases heat

• Absorbs exactly 3.34 x 10⁵J/kg of heat

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