Question

224. Differentiate between chemical change and physical change.​

Answer 1

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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.

Answer 2

A chemical change means a new substance with new properties was formed. ... When milk turns sour, this is a physical change because a change in odor does not indicate a chemical change.