The chemical reactions have 4 kinds: synthesis reactions、decomposition reactions、single replacement reactions、double replacement reactions.  And there’re the pictures of examples and general equations.

Synthesis reactions: two or more reactants combine to produce a single product

decomposition reactions: a single product breaks down to produce two or more products

single replacement reactions: a reactive element( mental or non-mental ) and a compound react to produce another element and compound

double replacement reactions: two ionic compounds reactive to produce two compounds (one of the products often forms a precipitate).