Example 1 Write and balance the chemical equation for each given chemical reaction. Then there are the two solid rocket boosters, which use a solid fuel mixture that contains mainly ammonium perchlorate and powdered aluminum. For example, you know that the reactant is NaCl, and that the products are Na and Cl2.
Count the number of moles of each element on both sides of the decomposition reaction. A chemical reaction expresses a chemical change. Other examples of these special conditions will be encountered in more depth in later chapters.
Step 1. The oxidation half-reaction lost three electrons; the reduction half-reaction gained two electrons. Determine which has undergone oxidation and which has undergone reduction.
We have six hydrogen atoms in the reactants, so we need six hydrogen atoms in the products. Because there is a change in the oxidation numbers of the reactants during the reaction, this is a redox reaction. Can we change the subscripts in the formula for water so that it has two oxygen atoms in it?
Also, the convention is to use all whole numbers when balancing chemical equations. This is indicated in Table 1.