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A substance that is a solid at room temperature was heated above its melting point and then allowed to cool at a steady rate - Junior Cycle Science - Question a - 2010
Question a
A substance that is a solid at room temperature was heated above its melting point and then allowed to cool at a steady rate. The temperature was taken at regular in... show full transcript
Worked Solution & Example Answer:A substance that is a solid at room temperature was heated above its melting point and then allowed to cool at a steady rate - Junior Cycle Science - Question a - 2010
Step 1
Why is there no drop in temperature between B and C?
Answer
Between points B and C on the graph, the substance is undergoing a phase change from liquid to solid. During this change, the temperature remains constant because the system is absorbing or releasing latent heat, rather than changing temperature. This latent heat is required for the transformation of the state, and hence, even though heat is being removed, there is no temperature decrease until the substance has completely solidified.