These are chemical reactions that absorb heat from their surroundings.
Endothermic Reactions cheat sheet for homework
These are the opposite of endothermic reactions; they release heat into their surroundings.
This is the minimum amount of energy required to start a chemical reaction. For endothermic reactions, this is typically higher than for exothermic ones.
This is the study of energy and its transformations, which includes understanding concepts like endothermic and exothermic reactions.