1. Addition polymerizations occur when a monomer forms a highly reactive _____.

a. particle b. free radical c. monomer d.reactant

2. A polymerization reaction that produces a smaller molecule as a by-product is known as a ______.

a. condensation polymerization b. small product polymerization c. Addition polymerization d. cross-linking polymerization

3. When polymer chains entangle randomly, they have a(n) _____ arrangement a. crystalline b. random c. disordered d. amorphous

4. The molecular links in the polymer chain are called _____, and they are formed from one or more molecules called monomers.

a. Step-growth polymerizations b. Polymers c. Repeat units d. Chain growth polymerizations

6. Polybutene is used to make pipes which carry hot water under pressure. This is very useful in plumbing and underfloor heating.

(a) Draw the structure of butene. (b) Draw polybutene by showing 3 monomer units linked together.

7. For each of the following examples, suggest a property of the plastic that makes it suited for the use described.

(a) Nylon is used for hiking jackets. (b) PVC is used to make rain gutters and window frames. (c) Polyethene is used to make plastic bags.