1.Physical change: A change in size shape or state.without forming a new substance.
2.Chemical change: A change in matter that produces a new substance with different properties from the original.
3.Chemical reaction: A chemical change of original substances into one or more new substances.
4.Reactant: One of the original substances before a chemical reaction takes place.
5.Product: One of the new substances produced when a chemical reaction takes place.
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