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Chemical Reactions

A chemical reaction can be represented by a chemical equation. In a chemical equation representing an irreversible reaction, the substances that react (reactants) are written on the left side, while the resulting substances (products) are written on the right side of an arrow.

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In the reaction shown above, two molecules of hydrogen react with one molecule of oxygen, forming two molecules of water. Balancing of equations will be covered a little later in this chapter.

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