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What is the first step of a chemical equation?

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The first step is to decide which substances are the reactants and which are the products. For example natural gas (cooking gas) burns in air providing heat and producing no visible products. The natural gas is principally methane and the portion of the air that reacts (supports combustion) is oxygen. These are the reactants. Products of the reaction are heat and two invisible gases carbon dioxide and water vapor. We can now write the word equation methane?+?oxygen???carbon dioxide?+?water vapor?+?heat.

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