A reaction that uses up energy is said to be endothermic.
Endothermic reactions
Endothermic reactions are reactions that take up energy in the form of heat from the surroundings. Thus, the reaction vessels are usually colder than the environment when felt.
Endothermic reactions are unique from exothermic reactions because the latter release energy in the form of heat to the surroundings. Thus, the reaction vessels of exothermic reactions are usually warmer than the surrounding.
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