Answer:
Compounds are chemical substances made up of two or more elements that are chemically bound together in a fixed ratio. Compounds are represented by their chemical formula. A chemical formula is a symbolic representation of the proportions of atoms that constitute a particular chemical compound.
Examples of compound and their formula
| Compound name | Molecular formula |
| Acetic acid | CH3COOH |
| Hydrochloric acid | HCl |
| Sulfuric acid | H2SO4 |
| Ammonia | NH3 |
| Nitric acid | HNO3 |
| Phosphoric acid | H3PO4 |
