Define chemical reaction.
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A combination reaction is a reaction in which two reactants combine to form one product. Oxygen and the halogens are very reactive elements and are likely to undergo combination reactions with other elements.
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A chemical reaction is a process in which one or more substances, also called reactants, are converted to one or more different substances, known as products.A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.
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