Compounds
A compound is two or more elements that are chemically combined.
The table below shows some common compounds.
| Compound | Formula | Elements present |
| water | H2O | hydrogen, oxygen |
| carbon monoxide | CO | carbon, oxygen |
| carbon dioxide | CO2 | carbon, oxygen |
| sulfur dioxide | SO2 | sulfur, oxygen |
| sulfur trioxide | SO3 | sulfur, oxygen |
| nitrogen monoxide | NO | nitrogen, oxygen |
| nitrogen dioxide | NO2 | nitrogen, oxygen |
| ammonia | NH3 | nitrogen, hydrogen |
| hydrochloric acid | HCl | hydrogen, chlorine |
| nitric acid | HNO3 | hydrogen, nitrogen, oxygen |
| sulfuric acid | H2SO4 | hydrogen, sulfur, oxygen |
| Compound | water |
|---|---|
| Formula | H2O |
| Elements present | hydrogen, oxygen |
| Compound | carbon monoxide |
|---|---|
| Formula | CO |
| Elements present | carbon, oxygen |
| Compound | carbon dioxide |
|---|---|
| Formula | CO2 |
| Elements present | carbon, oxygen |
| Compound | sulfur dioxide |
|---|---|
| Formula | SO2 |
| Elements present | sulfur, oxygen |
| Compound | sulfur trioxide |
|---|---|
| Formula | SO3 |
| Elements present | sulfur, oxygen |
| Compound | nitrogen monoxide |
|---|---|
| Formula | NO |
| Elements present | nitrogen, oxygen |
| Compound | nitrogen dioxide |
|---|---|
| Formula | NO2 |
| Elements present | nitrogen, oxygen |
| Compound | ammonia |
|---|---|
| Formula | NH3 |
| Elements present | nitrogen, hydrogen |
| Compound | hydrochloric acid |
|---|---|
| Formula | HCl |
| Elements present | hydrogen, chlorine |
| Compound | nitric acid |
|---|---|
| Formula | HNO3 |
| Elements present | hydrogen, nitrogen, oxygen |
| Compound | sulfuric acid |
|---|---|
| Formula | H2SO4 |
| Elements present | hydrogen, sulfur, oxygen |
