1 The term that describes the change in the concentration of a reactant divided by the change in time of the reaction is the ____________.A) rate constant B) average reaction rate C) activated complex D) chemical reaction 2 What is the term used to describe the minimum energy needed to form an activated complex?A) temperature B) kinetic energy C) activation energy D) potential energy 3 Chemical A breaks down into chemical B. At t=0, [B] = 0.00 M. At t=5.00 s, [B] = 0.150M. What is the average reaction rate? (60.0K)A) -0.0300 mol/Ls B) 0.0300 mol/Ls C) 0.300 mol/Ls D) -0.300 mol/Ls 4 What factors might prevent a collision of molecules from resulting in a reaction? (44.0K)A) incorrect orientation B) insufficient energy C) both a and b D) none of the above 5 What will happen when you decrease the surface area of a reactant?A) The reaction speeds up. B) The reaction slows down. C) The reaction stops. D) The reaction rate does not change. 6 A substance that speeds up the reaction rate but is not consumed in the reaction is a(n) ____________.A) reactant B) product C) catalyst D) inhibitor 7 What is the name given to a catalyst that exists in the same physical state as the reaction being catalyzed?A) homogeneous catalyst B) heterogeneous catalyst C) solid-state catalyst D) ephemiral catalyst 8 In the rate-law expression, Rate = k[A], what does the symbol k represent?A) instantaneous rate B) concentration C) specific rate constant D) reaction order 9 What is the reaction order for each reactant in the following rate-law expression? Rate = k[A][B]2 [C]3 A) first order for A, first order for B, first order for C B) first order for A, second order for B, first order for C C) first order for A, second order for B, third order for C D) first order for A, second order for B, second order for C 10 What is the most common experimental method for evaluating a reaction order called?A) method of final rates B) method of instantaneous rates C) method of initial rates D) method of experimental rates 11 Suppose the rate law for a particular chemical reaction involving reactants Q and T is Rate = k[Q]2 [T]2. What will be the result of doubling the concentration of Q?A) rate doubles B) rate halves C) rate triples D) rate quadruples 12 What is the instantaneous rate for a reaction that is second order in A and first order in B when [A] = 2M and [B] = 3M? The specific rate constant for the reaction is 0.1 M-2s-1.A) 12 M/s B) 1.2 M/s C) 0.12 M/s D) 0.012 M/s 13 What are the units that generally express a reaction rate?A) liters per mole per second B) moles per liter per second C) seconds per liter per mole D) seconds per mole per liter 14 What are the individual steps in a complex reaction known as?A) complex steps B) elementary steps C) intermediate steps D) rate-determining steps 15 In the reaction shown, which of the three activated complexes represents the rate-determining step? (51.0K)A) the first B) the second C) the third D) none of these