Examine the diagram below 80 60 40 reactants 20 products 0 Reaction Progress c. What is the change in enthalpy with and without the presence of a catalysts? d. What role does the catalyst have in this reaction? Potential Energy (kJ) without catalyst with catalyst a. What is the energy of activation for the forward reaction with and without the catalyst? b. What is the energy of activation for the reverse reaction, with and without the presense of a catalyst ysts?

3. Draw a reaction energy diagram, and label the product (P), reactant (R), transition states (TS1, TS2, etc.), intermediates (INT1, INT2, etc.) and activation energies (AG‡₁, AG 2, etc.) for a reaction with the following criteria: i. A three-step, endothermic reaction; ii. AG3 > 0 but AG₁ AG‡₁ >> AG‡₂. Which species does the structure of the transition state of the rate-determining step resemble?

Consider the following mechanism: Cl2 → Cl+ + Cl- Cl- + H2S → HCl + HS- Cl+ + HS- → HCl + S What is the role of Cl+?   A. product   B. intermediate   C. catalyst   D. reactant

Energy (kJ) Energy (kJ) Why do catalysts increase reaction rate? Catalyst Effect on Reaction Path Examples. Catalytic Convertors Reactants Products Interpret the following potential energy diagrams (reaction coordinate diagrams) Reaction 1 Reaction 2 450T B. A+B Time Reaction coordinate, A B A + B → C 1. Which reaction is endothermic? 2. What is the activation energy of Reaction 1? 3. What is the AHrxn of reaction 1? 4. What is the activation energy of reaction 2? 5. What is the AHnn of reaction 2? 6. Sketch the effect of a catalyst on both reactions 7. Does a catalyst effect the AHrn?

Consider the reaction profile shown in image. The activation energy of the reaction is represented by the difference in energy between points_________. a. A and D b. A and C c. B and C d. A and B

Consider the reaction energy diagram shown below. The reaction shown is reversible, it can proceed from reagents-> products or produCts->reagents. In which direction do you think the reaction has a higher rate constant, k? reactants Reaction pregresk O a. both k's are the same. b. reactants-> products has the higher k. C. reactants to products always has the larger k d. products -> reactants has the higher k. Posential cncrgy

Answer the following question using the reaction coordináte diagram shown below. 280 240 200 160 120- 80 40 Time What is the activation energy for the reverse reaction? O A. -160 kJ B. -80 kJ O C. 80 kJ D. 160 kJ tent (H) kilojoules

7, Q1