Question

3. Please answer the following questions concerning the two energy diagrams depicted below. (10 pts) Energy Diagram A 30 25 20 15 10 0 10 15 20 25 Energy Diagram B 30 25 20 15 10 15 20 25 10 (a) Do the energy diagrams represent concerted or stepwise reactions? Concerted (b) Label the axes, the reactants (R), products (P), any intermediates (), activation energy (E), enthalpy of reaction (AH), and transition state(s) (TS) on the above diagrams. (c) Do the energy diagrams represent endothermic or exothermic reactions? (d) Which energy diagram represents the faster reaction? (e) Which energy diagram represents the more favored product?

Answer 1

riven that Enersy diagrams A faster reactions • Transition state (TS) ŞActivation energy (a) Potential energy Reactants (R) 5t------ Henthalpy of reaction Cato) Products CP Reaction progress Energy diagram Slower reactions ransition state (TS) Products (P) Potential energy TAH Reactants ist (R) SActivation enersa (Ea) 's Reaction P- o9xe(s @ In above energy diagram no intermediate is formed on transition state(Ts) is formed above energy diagram shows single step Lion le concerted reaction Hence, energy diagram represent concerted reactions. .

The reactants (R) Product (P). activation energy (Eal enthalpy of reaction LAH) and transition states (Ts) are labeled in above energy diagram A and B . o we know that in an endotheomic reaction energy of the products is greater than the energy of reactants de enthalpy of reaction (AHO) is positive. In energy diagram B energy of products is greater than the energy of reactants i e enthalpy of reaction (OH) is positive. Hence, enersy diagram B represent endothermic reactions. In Energy diagram A energy of products is lower than energy of reactants ie enthalpy of reaction COH) is negative. Hence, energy diagram a shows Exothermic reactions. @ we know that if activation energy (Ea) of reaction is high than reactions occur slowly while it Ea is low than reactions occur fastly. Ea is low in Energy diagram A than Energy diagram B so reactions in Enersy diagram A likely to occur faster than reactions in energy diagram B.