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Can a sample of matter change its composition or state?

Updated: 8/17/2019
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14y ago

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For chemical reactions, the elements in a sealed vessel will not change. But, reactions can take place that would tend to take the sample to a state of equilibrium. Or, with heating or cooling the physical state can be changed.

Another type of reaction is nuclear decay, in which radioactive substances will spontaneously decay to other radioactive substances, or decay to non-radioactive substances, thus actually changing the elements present.

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Q: Can a sample of matter change its composition or state?
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