Unit 7 - Kinetics | Answer Key - Edubirdie

University:
Winston-Salem Forsyth County Schools
Course:
AP Chemistry
Academic year:

2014
Views:

410

Pages:

6
Author:

catfever701r

Exam- Form A Unit 7- Kinetics Namel MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) As the temperature of a reaction is increased, the rate of the reaction incrcases because the A) reactant molecules collide less frequently B) reactant molecules collide with greater enengy per collision C) activation energy is lowered D) reactant molecules collide less frequently and with greater energy per collision E) reactant molecules collide more frequently with less energy per collision 2) Which one of the following graphs shows the currect relationship between concentration and time for a reaction that is second order in [AJ? A fast is charged with 0.124 mol of A and allowed to react to form B according to the reaction A(g) - I(g). The following data are obtained for (A] as the reaction proceeds: Time (S) Moles of A 10 201 30 0.124 0.110 0.088 0.073 0.054 3) How many moles of B are present at 30 s? A) 24 × 10-3 3) 0.15 C) 0.073 D) 1.7 × 10-3 E) 0.051 4) A possible mcchanism for the overall reaction Brz (g) + 2NO (g) - 2NOBr (g) is NO (g) + Br2 (g) k1/ NOB:2 (g) (fast) NOUr (g) + NO(g) *2, 2NOBr (slow) The rate law for formation of NOßr based on this mechanism is rate - A) ky|NO|1/2 B) ky|Br211/2 D) 0k1/1-19(NOR 5) The reaction 2NO2 → 2NO + 02 follows second-order kinetics. At 300C, [NO| drops from 0.0100- to 0.00650-M in 100 s. The rate constant for the reaction is _ м-15-1, A) 0.096 B) 0.65 C) 0.81 D) 1.2 E) 0.54 6) The rate law of a reaction is rate = k|D][X]. The units of the rate constant are A) mol L-15-1 B) L. mol-1,-1 C) mol? L-25-1 D) mol L-14-2 E) 1.2 mol-2-1

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