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If a substance of unknown composition is heated in an open container will Its mass will stay the same as a result the mass of the container and its contents decreases. A substance of an unknown composition is heated in a sealed container the mass of the container and its content remains the same.

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10y ago

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When a substance changes state, Energy within the substance is gained or lost, but the composition is unchanged.


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What kind of change happens when the composition of substance does not change?

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