which. observation. determine. the. the. chemical. change. change. in. state. change. in. colour change. in. temperature. all. of. the. above
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In a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition. Although we call them physical "reactions," no reaction is actually occurring.
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