Which component is affected when a catalyst is added to a chemical reaction?
o the amount of substrate
O the activation energy
O the amount of product
the concentration of reactants

activation energy.

Explanation:

A catalyst is a substance that speeds up the rate of a chemical reaction by lowering the activation energy

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.