28. Chemical reactions proceed in the direction that causes the loss of free ene

Question

28. Chemical reactions proceed in the direction that causes the loss of free energy A. True B. False 29. Which of the following is true about an enzyme-catalyzed reaction path A. It increases the activation energy for a reaction by injecting energy into the system It increases the activation energy for a reaction by coupling reactions together C. It decreases the activation energy for a reaction D. It drives a reaction only in one direction 30. Energetically unfavorable reactions create order in the universe A. True B. False 31. In a reaction that has reached equilibrium, which of the following is correct? 32. Spontaneous reactions can only occur if A. G is negative B. G is positive C. G is greater than K D. G is less than or equal to K 33. Consider the following reactions Reaction 1: A B,aG-500 Reaction 2: Q W, G = +525 Reaction 3: F J,AG =-30 A. Which of the following is the most likely order of reactions: B. Reaction 1 Reaction 2 Reaction 3 C. Reaction 2 Reaction 1 Reaction 3 D. Reaction 1 Reaction 3 Reaction 2 E. Reaction 3 Reaction 2 Reaction 3

Explanation / Answer

28. True. Chemical reactions proceed in the direction causes the loss of energy when reactions are spontaneous I.e. Delta G = negative.

29. Enzyme catalyzed reactions are those in which activation energy for the reaction is decreases by enzymes.

30. Energetically unfavorable reactions are those which create order in the universe. True.

31. Delta G standard = delta G for the reaction in equilibrium.

32. Delta G should be negative for spontaneous reactions to occur.

33. In reaction 1 delta G is very much negative so its a spontaneous reaction then in reaction 2 lot of energy consumed for the reaction to take place because delta G is positive while in 3rd there is release of energy means exothermic reaction again like 1st reactio. Here all the reactants and products are different so, I think option d is correct. Means first reaction was spontaneous then in 2nd reaction little energy released and finally need to add more energy to make reaction to take place.

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