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What do heating and cooling curves show?
Heating and cooling curves show how temperature changes when a substance is heated up or cooled down.
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What do the flat sections on a heating or cooling curve represent?
The flat sections are when the substance changes state, like melting, boiling, freezing or condensing.
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Explain why the temperature doesn't increase at the melting point and boiling point during heating.
Energy goes into breaking bonds between particles, turning the solid to liquid or liquid into gas.
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