Question

Which two molecules are compounds? NaHCO3 , O3 , Cl2 , C8H18

Answer 1

NaHCO3 and C8H18, a compound must be made up of different elements, so O3 and Cl2 (both containing one element) are just elements

Answer 2

The right answer is: NaHCO3 and C8H18.

A molecule is a set of atoms (at least two) identical or not, united to each other by means of chemical bonds. These are the results of the pooling of a number of electrons gravitating on the outer layer of the atoms.

A simple molecular compound generally consists of at least two non-metals.

Molecular compounds owe their name to the fact that they form molecules. A molecule is the smallest unit of a pure substance that has at least two atoms covalently linked. Molecules are not all compounds. The compounds consist of at least two different elements.

A molecule may have two or more atoms of the same element covalently bound. The oxygen in the air you breathe is composed of two oxygen atoms covalently bound. It is represented by the symbol O2. We are talking about an oxygen molecule and not a compound.