what are physical and chemical changes ??
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Key Points. Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.
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A physical change is a temporary and reversible change in which the physical properties of the substance changes without altering the composition of the substance.
A chemical change is a permanent, not easily reversible change in which the identity of the substance is altered to produce one or more new substances.
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