Synthesis and decomposition

The different combinations of synthesis and decomposition reaction

Binary Ionic Compound

Element + Element → Binary Ionic Compound (Synthesis)

Binary Ionic Compound → Element + element (Decomposition)

Example: Na + Cl → NaCl (vice versa)

Polyatomic Acid

Nonmetal oxide + water → Polyatomic acid (synthesis)

Polyatomic acid → Non-metal oxide + water
Ex: CO2 + H2O → H2CO3

Base

Metal oxide + water → Base (Synthesis)

Base → Metal oxide + water (Decomposition)

Production of salt

Metal oxide + Non-metal oxide → Polyatomic acid (Synthesis)

Polyatomic acid → Metal oxide + non-metal oxide (Decomposition)

Complete combustion

Hydrocarbon + O2 → CO2 + H2O (vice versa)

Incomplete combustion

Hydrocarbon + O2 → CO2 + H2O + C + CO

Gas test

Oxygen gas: re-lights glowing splint test

Hydrogen gas: pops when doing burning splint test

Carbon dioxide: extinguishes fire in burning splint test