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Fourth form revision stack

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
What is specific heat capacity?   The energy needed to change the temperature of 1kg of something by 1 degree without a change of state.  
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What is specific latent heat?   The energy needed for 1 kg of substance to change state without a change in temperature.  
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Units of specific heat capacity?   Joules per kg per degree Celsius.  
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Units of specific latent heat?   Joules per kg  
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What is another word for melting?   Fusion  
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What does condensation mean?   Change from gas (or vapour) to liquid.  
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What does sublimate mean?   Change from solid to gas.  
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Name two ways liquids change to gases.   Boil and evaporate  
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Why does a boiling liquid have bubbles but an evaporating one does not?   Evaporation just from surface, boiling all through liquid.  
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Name three ways to increase rate of evaporation of some water.   Larger area, breeze, higher temperature.  
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What happens to KE of molecules when temperature rises?   The KE increases.  
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Why do molecules need energy for a liquid to vapourise?   Bonds between molecules in the liquid need to be broken.  
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What does a horizontal section of a cooling curve show?   steady temperature, probably change of state  
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What is Melting Point?   Temperature when solid turns to liquid.  
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What is Freezing Point?   Temperature when liquid turns to solid.  
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Specific Latent Heat of fusion of a metal is 200 kJ per kg. How much energy is given out when 3 kg solidifies at 150 degC?   600kilojoules (600 000 joules)  
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Specific Heat Capacity of a liquid is 3000 J per kg per deg C. How much heat energy is needed to warm 2 kg by 3 deg?   18 000 joules (18 kJ)  
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At any temperature, a liquid has a mixture of fast and slow molecules. Which ones are most likely to escape by evaporation?   Fast ones  
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If the average KE of the molecules in a liquid goes down, what happens to the temperature?   It falls, liquid cools.  
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What does KE stand for?   Kinetic Energy  
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Created by: waslancing
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