If you were building a device that used a chemical reaction to preserve food, like those used in refrigerators, what kinds of reactions would you experiment with?
a. exothermic
b. combustion
c. endothermic
d. spontaneous

In order to preserve substance, we must create a low temperature environment. In order to do this, we must remove the heat energy in the environment via reactions that will absorb heat energy. These are endothermic reactions. The answer is C.

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