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What happens to the speed of the molecules in a substance when heat is added?
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The speed of the molecules is increased as they absorb heat energy. That's why liquid melt and turn into gas. They are rapidly moving further apart :).
"Substance" would have to be a liquid or gas. But duneybear is absolute right: as they absorb more heat energy, they convert it to kinetic energy and move around in it faster.
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