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I assume you're talking about the different types of chemical reactions. Generally speaking, there are five: synthesis, decomposition, combustion, single replacement, and double replacement. Here are examples of each:

Synthesis: 2 reactants, 1 product: 2Na + Cl2 --> 2NaCl

Decomposition: 1 reactant, 2 products: H2CO3 --> H2O + CO2

Combustion: fuel + oxygen --> carbon dioxide + water: CH4+2O2--> CO2+2H2O

Single replacement: 3CuCl2 + 2Al --> 2AlCl3 + 3Cu

Double replacement: CaCl2 + Na2O --> 2NaCl + CaO

There's also redox (oxidation/reduction) and acid-base, but that's a separate issue.

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