How does a catalyst speed up a chemical reaction? a. by lowering the activation energy b. by lowering the δh of the reaction c. by raising the energy of the products d. by raising the energy of the reactants

A. by lowering the activation energy

Explanation:

Adding a catalyst has this effect on activation energy. A catalyst provides an alternative route for the reaction with a lower activation energy. As illustrated in the attached image.This means that more particles have the activation energy required for the reaction to take place (compared to without the catalyst) and so the speed of the reaction increases.

What are the choices?

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