Rubber is made from long-chain molecules, called polymers, which are normally all scrunched up. When you stretch a rubber band, you _______ the molecules and pull them apart, so the rubber gets longer. When you let go, _______ bonds between the polymers help to snap them back into place. This is what makes an elastic material such as rubber (one that returns to its original shape and size) different from a plastic material (one that changes shape but doesn't go back exactly to how it was), which includes most metals as well as most plastics. A) break; ionic B) weaken; polar C) bend; covalent D) straighten; cross-link
Chemistry · High School · Mon Jan 18 2021
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Rubber is made from long-chain molecules, called polymers, which are normally all scrunched up. When you stretch a rubber band, you straighten the molecules and pull them apart, so the rubber gets longer. When you let go cross-link bonds between the polymers help to snap them back into place. This is what makes an elastic material such as rubber (one that returns to its original shape and size) different from a plastic material (one that changes shape but doesn't go back exactly to how it was), which includes most metals as well as most plastics.