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A change that cannot be undone

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A change that can be undone

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When matter changes form but not chemical makeup (Think: ice melting)

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When two or more substances are combined in a way that produces one or more substances

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The number of times an experiment is repeated

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All states of matter (solids, liquids and gases) have mass!

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The amount of matter in an object

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A question that can be answered by conducting an experiment and using data

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Anything that has mass and takes up space