Part II. Formulas From Names

Write the chemical formula of the covalent compounds

below.

11. Carbon dioxide

CO2

CO₂

Explanation:

Carbon dioxide is a covalent compound. Two double bonds are formed between two oxygen atoms and one carbon atom. O=C=O

The covalent bond between them are polar.

Covalent bond:

It is formed by the sharing of electron pair between bonded atoms.

The atom with larger electronegativity attract the electron pair more towards it self and becomes partial negative while the other atom becomes partial positive.

For example:

In carbondioxide the electronegativity of oxygen is 3.44 and carbon is 2.55. That's why electron pair attracted more towards oxygen, thus oxygen becomes partial negative and carbon becomes partial positive. The electronegativity difference is 0.89 that's why it is polar covalent bond.