If no coefficient appears in front of a molecule, we interpret this as meaning one. In writing chemical equations, the number in front of the molecule's symbol (called a coefficient) indicates the number of molecules participating in the reaction. Given this information, one might guess that the equation for this reaction is written: To write the chemical equation for this reaction, we would place the substances reacting (the reactants) on the left side of an equation with an arrow pointing to the substances being formed on the right side of the equation (the products). If we had a container of hydrogen gas and burned this in the presence of oxygen, the two gases would react together, releasing energy, to form water. Let's take the reaction of hydrogen with oxygen to form water as an example. A chemical equation is shorthand that scientists use to describe a chemical reaction. A chemical reaction is the process by which substances bond together (or break bonds) and, in doing so, either release or consume energy (see our Chemical Reactions module). To view it, go here.Ĭhemical reactions happen all around us: when we light a match, start a car, eat dinner, or walk the dog.
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