Question

45. Which of the following letters represents AH energy diagram? for the forward reaction in the following A) A B) B C) с D) D 46. Which step would most likely have the largest energy of activation? сн. step 1 step 2 step 3 A) Step one B) Step two C) Step three D) It cannot be determined from the information provided 47. A decrease in which of the following results in an increase in the rate of a chemical reaction? A) Energy of activation B) Concentration C) Temperature D) Kinetic energy

Answer 1

This question is explained as follows:

Sol : 45 In any energy diagram; various energy levels. represent different things. het us understand them first - (according to the given diagram) R T P Reactants Transition State Products hona Reaction co-ordinates . * Now as we are given in the above diagram; the ene- - - rgy level of product is somewhat higher than that of the energy level of reactants, which means that the reaction is not spontaneous / feasible & therefore it is endothermic! However, if the energy level of products would have been lower than that of reactants; the - reaction would have been called exothermic (feasible * AH is the standard enthalpy of a reaction i e, AHO = H - H ie, the difference b/w the energy levels of reactants & - products is called standard enthalpy of ron In the given diagram; this AH is represented by D. for the sake of simplicity , let us cenderstand the indications of all other energies - Pat Reacht

lorward sou activation, of reactant energy of pd dion Threshold Energy for R I I activation backward E Energy level of products "Ah" (Standard enthalpy of song Energy level of reactants