In the same case of water bottles, why are some bottles very flimsy, while others are very firm?
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Plastics are polymers or, long repetitive molecules repeated over and over. It is the way in which those molecules connect to each other that make them hard or strong. How many bonds and what type of bonds do they share between them?
Imagine a bunch of people all holding onto each other with one hand each, soft plastic. If all the people were holding on with both arms and a leg, hard plastic.
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