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A change that alters the form or appearance of a material but does not make the material into another substance
A change in which one or more substances combine or break apart to form new substances
A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction
A reaction where a new substance is formed or a substance is broken down into others
A chemical reaction in which two or more simple substances combine to form a new, more complex substance
A chemical reaction in which one element replaces another in a compound or when two elements in different compounds trade places
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