write four differences between physical and chemical change.
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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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Physical changes only affects physical properties such as size shape and state
no new substance is formed
it can be reversible and irreversible
the amount of energy required is small
chemicalchange
new substance is formed
it is mostly irreversible
energy changes are large
changes take place in chemical properties
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