The correct answer is:
exothermic
Endothermic means it cools down or absorbs heat. Exothermic means it heats up or releases heat. Bond energies determine if a reaction is endothermic or exothermic.
Explanation:
Many chemical reactions consume or release heat and energy as part of the process. An exothermic reaction is any response that releases or gives off energy through the reaction. You can learn this by arranging together 'exo-' which means to exit, with 'therm' which refers to heat. Displayed in a chemical equation: reactants → products + energy.