| A | B |
|---|
| Mercury II oxide changes to mercury and oxygen | decomposition |
| Plants take carbon dioxide and water to make sugar | synthesis |
| zinc metal reacts with hydrochloric acid | single replacement |
| iron placed in CuCl2 solution | single replacement |
| silver nitrate + sodium chloride | double replacement |
| Sodium sulfate + barium chloride | double replacement |
| Silver metal dipped into gold chloride solution | single replacement |
| Nitrogen gas reacts with hydrogen gas to make ammonia (NH3) | synthesis |
| Electricity is used to change water into hydrogen and oxygen | decomposition |
| Hydrogen burns in air to produce water | synthesis and combustion |
| Methane (CH4) burns in air | combustion |
| Products of combustion of a hydrocarbon | water and carbon dioxide |
| Potassium sulfide + lead nitrate | double replacement |
| Zinc metal dipped into copper II sulfate solution | single replacement |
| Butane (C4H10) + oxygen gas produces carbon dioxide and water | combustion |
| sugar is changed to solid carbon and water vapor | decomposition |
| A + BX produces AX + B | single replacement |
| Al + O$O_2$ $ \longrightarrow$ Al2O3 | composition |
