Answers to AQA GCSE Specific Latent Heat
Practice Questions
1. Explain the difference between specific latent heat and latent heat.
Both represent the amount of energy needed to change the state of a substance, without changing temperature. However for specific latent heat 1kg of substance is used, whilst latent heat does not have a specific mass.
2. In the experiment above why is the heater switched off for the first part of the experiment
Some of the ice will melt due to the heat energy supplied by the surroundings. Using the heater switched off will allow us to measure the mass of ice that melts due to the heat energy supplied from the surroundings.
3. Substance X has a specific latent heat of fusion value of 290000J/kg and it needs 50,000J to change its physical state from a solid to a liquid. Calculate the mass of substance X.
m = E/Lf
m = 50,000/290,000 = 0.17kg
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