In order to combine the two, the number of electrons lost must equal the number of electrons gained. To couple them, the number of electrons must be cross-multiplied. 8.2 Ways to Classify Reactions. Another way of classifying reactions is by the type of products they form. Precipitation reactions can be predicted from a solubility table.
All precipitation reactions are double displacement reactions .
All acid-base reactions are also double displacement reactions . Any reaction where the oxidation state of the elements changes, is an oxidation-reduction reaction. 8.3 Other Ways to Classify Reactions. Whenever organic compounds react with oxygen, they produce water and carbon dioxide. Organic compounds are those that contain carbon and hydrogen as part of their formula.