24. Questions 24-25 refer to the following information. Reaction: A-only\" 2 B T

Question

24. Questions 24-25 refer to the following information. Reaction: A-only" 2 B The above reaction using a catalyst is run over a series of temperatures using identical initial concentrations. The initial rate of the reaction is determined. The data from these experiments is shown in the table below. Trial Temperature Initial Rate (M s) 2 x 103 4 x10 8 x10 1 ×10-6 2 x106 A] 25 30 35 40 45 4 Which of these would correctly explain the action of the catalyst at these temperatures? (A) The catalyst is a heterogeneous catalyst which becomes saturated at higher temperatures. (B) The catalyst is an enzyme catalyst whose tertiary structure is disrupted at higher temperatures. (C) The catalyst is a surface metal catalyst whose valence electrons cannot stabilize the transition state at higher temperatures. (D) The catalyst is an acid catalyst with a low transition state that does not require high temperatures. 25. What is the most likely cause of the increase in the initial reaction rate from trial 4 to trial 52 (A) The increase in the temperature has increased the number of A molecules that have the kinetic (B) The increase in the temperature has reactivated the catalyst so a greater number of molecular (C) At the higher temperature, a higher percentage of reactant molecular collisions have the (D) The rate of the uncatalyzed reverse reaction decreases at higher temperatures, thus the energy needed for the uncatalyzed Ea collisions can form products. proper relative orientation to form the products. forward reaction can proceed faster.

Explanation / Answer

24) The catalyst is a n enzyme catalyst whose tertiary structure gets disrupted at a higher temperature (TRUE)

The role of a catalyst is to lower the activation energy require to climb the potential energy hill by providing a bypass path and hence the rate of reaction increases. As evident from the data given, the rate of reaction increases upto temperature 35o C (after which it decreases) , this is a common tendency for all catalyst type, where rate of reaction increases with rise in temperature. However, for an enzyme catalyst, at higher temperature a part of the energy gets involved in the breaking of some weak force of attraction that exist in the tertiary protein structure of the enzyme. In otherwords protein denaturation occurs at higher temperature. As a result of which rate of reaction increases upto an optimum temperature and then shows a decrease with the further rise in temperature due to disruption in the enzyme structure.

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