What is the role of activation energy in a chemical reaction provide and explain one example

Activation energy is the energy that is required to kick off a chemical reaction. It is the energy absorbed by the reactants before it can start a chemical reaction.

Explanation:

Activation energy refers to the minimum amount of energy that reactants must absorb before a chemical reaction can kick off. This energy is also called the free energy of activation. Activation energy is not similar for all reactions, different reactions have different amount of activation energy.

The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na