Classification by types of reactants include acid-base reactions and oxidation-reduction reactions, which involve the transfer of one or more electrons from a reducing agent to an oxidizing agent. Cake batter rising is caused by a gas-forming reaction between an acid and baking soda (sodium hydrogen carbonate). Many reactions produce a gas such as carbon dioxide, hydrogen sulfide, ammonia, or sulfur dioxide.
Often a given reaction can be placed in two or even three categories, including gas-forming and precipitation reactions.
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