12. Which of the following factors increases the rate of a chem the activation e

Question

12. Which of the following factors increases the rate of a chem the activation energy barrier? a increasing the temperature b. decreasing the temperature es the rate of a chemical reaction by decreasing the activation adding a catalyst d. increasing the surface area of a phase inter face e increasing the concentration of reactants 13. The substrate in an enzyme-controlled biological reaction is a a molecule serving as a rigid support for the enzyme. b. molecule that is acted on by the catalyst c. species necessary for the proper functioning of the enzyme d. biological molecule used for storage of energy e. catalyst for that chemical reaction. 14· The rate of an enzyme reaction is pr 14, reaction is proportional to the concentrations of both substrate and enzyme , a. at all substrate concentrations t b. at low substrate concentrations at high substrate concentrations the rate is independent of substrate concentration. c. at lovw a lowsubstrate concentrations, at high substrate concentrations the rate is independent of enzyme concentration. d. at high substrate concentrations; at low substrate concentrations the rate is independent of substrate concentration. e. at high substrate concentrations, at low substrate concentrations the rate is independent of enzyme concentration. The solid a. silicon catalysts. b. zcolites. c. homogeneous catalysts. d. heterogeneous catalysts. e· enzymes. 15. The solid catalysts used in many industrial processes where the reactants are liquids or gases are referred to as 15 B. In a series of experiments, different initial amounts of A and B are mixed together, and the mixture in each case allowed to come to equilibrium. Which one of these experiments would yield values for the amounts of A and B present at equilibrium different from all the other experiments? a 3.0 moles A, 4.5 moles B b. 4.5 moles A, 3.0 moles B c. 1.5 moles A, 4.5 moles B d. 7.5 moles A, no B e 0.5 moles A, 7.0 moles B If the equilibium constants for the two reactions 16. Consider the gas-phase equilibriumA -17. 2 HCI(g)-* H2(g) + Clfg) and k(g)+ Ch(8)2 ICI(g) are denoted K, and K respectively, then the equilibrium constant for the reaction 2 HC(g) +I(g) 2 ICI(g)+H(g) equals (K/Ka) b. (K,K,P. c. KiK2. d. KitK e. K,K2/2

Explanation / Answer

12. Answer : d ( incresing surface area means increasing reactive sites)

13. Answer :c ( without substrte we can not do the reaction)

14. Answer :b

15 Answer :d

16 Answer :d

17 Answer :c

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