4. Because of the loss of the double bond, polyalkanes, like alkanes are unreactive.
5. Different polymer structures have different properties, which means they're suited to different uses.
Some typical uses of polyethene and polypropene are shown below:
Polyethene - (properties) soft, flexible (uses) plastic bags, squeezy bottles
Polyproene (properties) tough, strong (uses) bottle crates, rope
6. Many polymers are difficult to dispose of and are made from non-recyclable oil fractions, so it makes sense to recycle them. For example, polypropene is recycled - it can be melted and remoulded.
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