A polymer is a large molecule formed by
Correct answer: A. the joining together of many small repeating units called monomers
- A. the joining together of many small repeating units called monomers
- B. the breaking of a large molecule into small units
- C. mixing two liquids without any reaction
- D. heating a metal until it melts
Explanation
Thousands of monomer units link together to form a chain whose properties are quite different from those of the monomer, so gaseous ethene becomes solid polythene. The process is called polymerisation and it is either addition, in which nothing is lost, or condensation, in which a small molecule such as water is eliminated at each link. Breaking a polymer back into monomers is depolymerisation.
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About Polymers
Polymers are large molecules made from repeating monomer units joined by covalent bonds. The topic distinguishes addition polymers such as polyethylene, PVC and polystyrene from condensation polymers such as nylon and polyester, and relates chain structure to thermoplastics, thermosetting polymers, elastomers, properties, uses and environmental concerns.
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