2000 Chewing gum is made out of chemicals that are polymers.
Polymers are large molecules that are groups of smaller molecules hooked together in long chains.
Most plastics and rubber are polymers. Try this experiment to see what difference temperature can make to polymers and their flexibility. Put one in the freezer and leave one in the room for about twenty minutes. Take the gum out of the freezer and try to bend it. Try to bend the gum that is at room temperature.