Question

1. while working, a construction worker is bothered by a hurt muscle. he lays down to rest and places a heat pack under his back to keep his muscles loose. what type of chemical reaction occurs in the heat pack?

clear all
retrothermic
endothermic
exothermic
n.rathermic

Explanation:

An exothermic reaction releases heat. Since the heat pack is generating heat to keep the muscles loose, it is an exothermic reaction. Retrothermic is not a standard term in thermochemistry. Endothermic reactions absorb heat. There is no such term as "unrathermic" in thermochemistry.

Answer:

exothermic