Chemical reactions and energy

Question 1

Exothermic and endothermic reaction

Answer 1

When a chemical reaction takes place bonds are broken and new bonds are formed.
Breaking a bond requires energy
Creating a new bond releases energy
Therefore we have the equation:
Energy changing= bond breaking- bond making
If this answer is positive more energy is given out and the reaction is ENDOTHERMIC
if it is negative, energy is taken in and the reaction is EXOTHERMIC