Afourth person at the campfire doesn't care about cold hands. he only cares that his hot
chocolate stays warm. so he pours his hot chocolate into a styrofoam cup instead of a ceramic mug
what is special about styrofoam? briefly explain what the styrofoam is doing to keep the hot
chocolate warm.

Styrofoam's composition is mainly air. This makes it very hard for heat to flow through it, making it one of the best insulators, since it minimizes convention and conduction. By encapsulating air in small cavities, it prevents heat from escaping, thus keeping the hot chocolate warm. On the opposite, materials like metal don't insulate heat energy enough, which means they're bad insulators.

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.