Synthesis A + B → AB

Two or more elements or compounds combine to form a single new compound

ExamplesH2 + O2 → H2O

CO + O2 → CO2

CaO + H2O → Ca(OH)2

Decomposition AB → A + B

Single compound breaks down into two or more simpler substances

Catalyst – substance that speeds up a reaction without altering it

Decomposition Examples HgO → Hg + O2

NaCl → Na + Cl2

Combustion Reactions Hydrocarbon- compound of C, H

and sometimes O Hydrocarbons combine with oxygen

to form carbon dioxide and water Examples

CH4 + O2 → CO2 + H2O

C2H8 + O2 → CO2 + H2O

C6H12O6 + O2 → CO2 + H2O

Determine What Type of Reaction Each Is, Complete, and Balance

H2 + O2 → Na + Cl2 → Al2O3 → C12H24 + O2 → CO → NH3 + HCl → CCl4 →