Question

What is the difference between endothermic and exothermic reactions?

Answer 1

Endothermic is a chemical change in which heat is taken in (or absorbed).
<It starts out cold and later gets warmer>
Exothermic is a chemical change in which heat is released.
<It starts out hot, but gets cooler>

Answer 2

Endothermic take in energy.
Exothermic give out energy.


I remember it by imaging that the energy is either 'ENtering' or 'EXiting'.

Hope this helps.