Please explain each problem. Thanks

SQ-6. What changes when a catalyst is added to the reaction described by this energy diagram? (A) I and II (B) I and III (C) I only (D) III only Knowledge Required: (1) Interpretation of reaction energy diagrams. (2) Meaning of catalyst and activation energy. PQ-12. Consider the reaction potential energy diagram. What describes the catalyzed forward reaction pathway? (A) 10kJmol115kJmol1 (C) 25kJmol15kJ1mol1 (D) 25kJmol115kJmol1 PQ-13. Which line segment represents the activation energy for the reaction between C and D to form A and B ? (A) 1,2,&3 (B) 2 (C) 2&3 (D) 3 PQ-14. A certain reaction has H=75kJmol1 and an activation energy of 40k.1mol1.4 catalyst is found that lowers the activation energy of the forward reaction by 15kJmol1. What is the activation energy of the reverse reaction in the presence of the sume catalyst? (A) 25kJmmol1 (B) 60kJmmol1 (D) 100kJmol1