### CHAPTER 8 Chemical Equations and Reactions

atom and four hydrogen atoms Its chemical formula is CH 4 Recall that oxygen exists in nature as diatomic molecules it is therefore represented as O 2 The correct formulas for carbon dioxide and water are CO 2 and H 2O respectively A formula equationrepresents the reactants and products of a chemi-cal reaction by their symbols or formulas The formula equation for the

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