Cellular respiration involves many chemical reactions. When a chemical process involves a series of reactions, scientists may summarize the process with a single chemical equation. This equation shows only the key reactants and products. For example, cellular respiration often uses a sugar called glucose and oxygen gas as key reactants. This process can be summarized by the following chemical equation: glucose + oxygen → carbon dioxide + water Glucose, like other sugar molecules, often serves as an energy source for cells. Cells release energy by breaking down glucose through chemical reactions with oxygen gas. This process produces carbon dioxide gas and water. Use the tiles to complete the sentence. carbon The key reactants of this process are and . Submit