Combination reactions combine multiple substances into a single product, double-replacement reactions involve the exchange of ions between compounds, and decomposition reactions break down a single compound into multiple substances.
Combination reaction: When two or more substances combine to form a single product, it is known as a combination or synthesis reaction. An example is A + B → AB.
In double-replacement reactions, multiple reactants interchange ions to form different compounds. These reactions involve the exchange of ions between two compounds.
Decomposition reactions involve a single compound breaking down into multiple substances. An example is AB → A + B, where a single substance forms multiple products.
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