A chemical reaction may involve _______ of two ________ or ________ of a
compound in two or more elements or _____ and also involves _______ either is
absorbed or is evolved. This changes the _________ of the reactant as well.
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Chemical reactions involve breaking chemical bonds between reactant molecules (particles) and forming new bonds between atoms in product particles (molecules). The number of atoms before and after the chemical change is the same but the number of molecules will change.
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