when. a. change. occurs
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Physical changes occur when objects or substances undergo a change that does not change their chemical composition. This contrasts with the concept of chemical change in which the composition of a substance changes or one or more substances combine or break up to form new substances.
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Physical changes occur when objects or substances undergo achange that does not change their chemical composition. This contrasts with the concept of chemical change in which the composition of a substance changesor one or more substances combine or break up to form new substances.
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