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3 December, 03:46

The cooling curve shows temperature changes in a material as it is transformed from a liquid to a solid. Heat flows out at a constant rate. What is the source of the heat released from the material during the time interval when the curve is horizontal?

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  1. 3 December, 04:15
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    Addition of heat to a substance causes it to experience change in state. The heat added to the substance is the source of the heat released from the substance during melting.
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