What will you take into account while
identifying the following ?
(a) A physical change in a substance.
(b) A chemical change in a substance.
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(a) A physical change is a change to a sample of matter in which some properties of the material change, but the identity of the matter does not. When we heat the liquid water, it changes to water vapor.
(b) Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances.
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