(a)(i) What is meant by the activation energy of a reaction? (ii) State the effect of a catalyst on activation energy.
(b) What substance serves as a catalyst in each of the following? (I) Hydrogenation of oils (ii) Biochemical reactions.
Explanation
(a)(i) Definition: Activation energy. Activation energy is the minimum energy which reactant particles (reaction complex or reacting particles) must possess before a reaction can occur. (ii) A Catalyst: It lowers or alters the activation energy or provides an alternative pathway with a lower activation energy.
(b)(i) (finely divided) nickel (platinum, paladium), catalyses the hydrogenation of oils. (ii) Enzymes catalyse biochemical reactions.
