Direct Combination Reaction: 2 or more reactants come together to form a single product
EX. A + B ---> AB
2Na + Cl2 ---->2NaCl
S + O2 ---->SO2
Decomposition: a single compound is broken down into 2 or more smaller compounds or elements
EX. AB ---> A + B
2 H2O ----> 2H2 + O2
CaCo3 ----> CaO + CO2
Single-Replacement: an uncombined element displaces an element that is part of a compound
EX. A + Bx ---> Ax + B
Mg + CuSO4 ----> MgSO4 + Cu
Cl2 + 2KI ----> FeSO4 + Cu
Double-Replacement: atoms or ions from 2 different compounds replace eachother
EX. Ax + By ----> Ay + Bx
CaCO3 + 2HCl ----> CaCl2 + H2CO3
Janine R
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