Answer:
Chemical reactions always involve changes in energy.
Energy is released in chemical reactions
Explanation:
Chemical reactions involves the formation and breaking of bonds by the combination of atoms in a system.
- Chemical reactions always involve changes in energy which can be exothermic or endothermic in nature.
- When bonds are broken energy is always released, bond dissociation is an exothermic process.
- When bonds are formed, energy is used up and this process is an endothermic one.