some chemical reaction give off distinctive smells
.give one example....
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The difference between a physical reaction and a chemical reaction is composition. 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.
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Such smells can be attributed to specific molecules, though the smell of many substances comes from a combination of many molecules. Moreover small changes in molecules can make an amazing difference to their smell.
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