Why does every chemical reaction require a certain amount of activation energy?

A. Energy is released when the reactants begin to react.

B. Energy lost to the environment during the reaction must be replaced.

C. Forming the activated complex requires energy.

D. The products have more potential energy than the activated complex.

E. The reactants have less potential energy than the products.

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

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