Explain the terms polymer and monomer.

(N/A) Polymers are high molecular mass macromolecules composed of repeating structural units derived from monomers. Polymers have a high molecular mass $(10^{3} - 10^{7} \ u)$. In a polymer,various monomer units are joined by strong covalent bonds. Polymers can be natural as well as synthetic. Polythene,rubber,and nylon $6,6$ are examples of polymers. Monomers are simple,reactive molecules that combine with each other in large numbers through covalent bonds to give rise to polymers. For example,ethene,propene,styrene,and vinyl chloride.