Certain small molecules (monomers) react with one another in repetitive fashion (polymerization) to form long chain macromolecules (polymers). The properties of the macromolecules depend on the properties of the molecules used in their formation and on the lengths and structure of the polymer chain. Polymers can be natural or synthetic.
Materials exist throughout our physical world. The structures of materials influence their physical properties, chemical reactivity and use.
There are several ways in which elements and/or compounds react to form new substances and each reaction involves energy.