A chemical equation is the the method that is used to write the reactions taking place between two or mores elements or molecules. A chemical equation to be correct it should be balanced that is the number of reactants should also be equal to the number of products.Chemical equations also require state symbols that is s , l ,aq ,g for example; the reaction between hydrochloric acid and magnesium react to produce magnesium chloride and hydrogen gas,the equation is as follows : Mg(g) + HCl(aq) produce MgCl(aq) + H(g)

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