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# rate-determining

By Dean Flores,2014-06-21 18:07
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rate-determining

1

The following table of experimental data is necessary to answer the questions 1-5 below:

-For the reaction: 2ClO--(aq) + 2OH(aq) ? ClO (aq) + ClO (aq) + HO (l) 2322

-Experiment [ClO] [OH] Initial rate 2

1 0.060 M 0.030 M 0.0248 M/s

2 0.020 M 0.030 M 0.00276 M/s

3 0.020 M 0.090 M 0.00828 M/s

1.(5 pts) What is the order of the reaction with respect to ClO? 2

a) 1 b) 0 c) 2 d) 3 e) 4

2. (5 pts) What is the order of the reaction with respect to OH-?

a) 0 b) 1 c) 2 d) 3 e) 4

3. (5 pts) What is the order of the reaction overall?

a) 4 b) 0 c) 1 d) 2 e) 3

4. (5 pts) What is the value of the rate constant?

a) 1.15 x 10

4 b) 4.6 c) 230 d) 115 e) 713

2

22-1-1-2-2-1-1-1s b) Ms c) Ms d) Ms e) Ms

5. (5 pts) What are the units of the rate constant for the reaction?

a) M

6. (7 pts) The rate constant for a particular second-order reaction is 0.476 L/mol-s. If the

initial concentration of reactant is s 0.25 mol/L, it takes _______ s for the concentration

to decrease to 0.13 mol/l.

a) 7.8 b) 1.4 c) 3.7 d) 1.7 e) 0.13

8. (5 pts) The graph below depicts the relationship between concentration and time for

the chemical reaction indicated.. The slope of this line is equal to:

a) k b) -1/k c) ln[A]

d) k e) 1/k 0

-1 3

and the initial reactant concentration 0.902 M?

9. (5 pts) What is the half-life of a first-order reaction with the rate constant 0.0271 s a) 0.451 s b) 40.9 s c) 25.6 s d) 0.625 s e) not enough information given

10. (4 pts) In the energy profile of a reaction, the species that exists at the maximum on

the curve is called the ___________.

a) product

b) activated complex

c) activation energy

d) enthalpy of reaction

e) atomic state

4

-111.(7 pts) A reaction with activation energy of 123 kJ/mol has a rate constant of 0.200 s

at 311 K. At a temperature of ____K, the rate constant will be double that at 311 K.

(R = 8.314 J/mol-K)

a) 304 b) 316 c) 622 d) 349 e) 246

12. (6 pts) You have studied the gas-phase oxidation of HBr by O

. 2

4 HBr (g) + O(g) ? 2 HO(g) + 2 Br(g) 222

The reaction is first order with respect to HBr and first order with respect to

O. The following mechanism has been proposed. 2

HBr(g) + O(g) ? HOOBr(g) Reaction 1 2

HOOBr(g) + HBr(g) ? 2 HOBr(g) Reaction 2

HOBr(g) + HBr(g) ? HO(g) + Br(g) Reaction 3 22

Based on the rate law, which step(s) is(are) rate-determining?

a) 1 b) 2 c) 3 d) 1 & 2 e) 2 & 3

5

for the equilibrium c

H(g) + I(g) ? 2HI (g) 2213. (6 pts) The value of K o is 54.0 at 427C. At this temperature, what is the value K for: c

HI(g) ? ? H(g) + ? I(g) 22

3-4 a) 27 b) 7.35 c) 0.136 d) 2.92 x 10 e) 3.42 x 10

14. (6 pts) Consider the reaction:

4CuO(s) + CH

(g) ? CO(g) + 4Cu(s) + 2HO(g) 422

o The value of K for this reaction is 1.10 at 25C. What is the value of K for this cp

reaction? (R = 0.0821 L-atm/K-mol)

-3 a) 658 b) 37.2 c) 26.9 d) 4.63 e) 1.52 x 10

6 in a 3.00 L vessel that was charged 3

with 0.123 atm of PCl is ______ atm if K = 0.0121. 5p

15. (8 pts) The equilibrium partial pressure of PCl

PCl(g) ? PCl(g) + Cl(g) 532

a) 0.078 b) 0.0450 c) 0.0900 d) 0.0330 e) 0.0657

7

o and 2.000 mol of I at 448C. 2216. (10 pts) A 1.000-L flask is filled with 1.000 mol of HThe value of the equilibrium constant, K, for the reaction eq

H(g) + I(g) ? 2HI(g) 22

oAt 448C is 50.5. What is the partial pressure of HI in atm in the flask?

(R = 0.0821 L-atm/mol-K)

a) 110.6 b) 3.85 c) 63.1 d) 234 e) 145.6

8

for the reaction: eq 17.(6 pts) At 1000K, the value of K

2SO(g) ? 2SO(g) + O(g) 322

is 0.338. Calculate the value of Q and predict the direction in which the reaction will

proceed toward equilibrium if the initial partial pressures of reactants are P = 0.16 SO3

atm; P = 0.41 atm; P = 2.5 atm SO2O2

a) Q > K; reaction will proceed from left to right

b) Q > K; reaction will proceed from right to left

c) Q = K; reaction will not proceed

d) Q = K; reaction will proceed from right to left

e) Q = K; reaction will proceed from left to right

18. (5 pts) For the endothermic reaction:

CaCO

(s) ? CaO(s) + CO(g) 32

only ________ would favor shifting the equilibrium position to form more CO gas. 2

a) increasing the system temperature

b) decreasing the system temperature

c) increasing the system pressure

d) increasing both the system temperature and the system pressure

e) both decreasing the system temperature and increasing the system pressure

9

o19 (5 pts) Consider the following reaction at equilibrium (g) ? N(g) + 3 H(g) ?H = + 92.4 kJ (endothermic) 322

2NH This reaction will shift to the right with _________.

a) increasing both temperature and pressure

b) increasing the temperature and decreasing the pressure

c) decreasing both temperature and pressure

d) decreasing temperature and increasing pressure

e) the addition of extra N in the container. 2

20 (5 pts) Which one of the following would be considered a base according to the

Brønstedt-Lowry definition but not by the Arrhenius definition.

a) NH

(g) b) HBr(aq) c) Ba(OH)(aq) d) HF(g) e) KOH(aq) 32

21 (5 pts) What is the conjugate acid of NH? 3

+++ a) NH b) NH c) NH d) NH e) NHOH 32344

o 10 C is ________.

a) 3.00 b) 1.52 c) 3.51 d) 0.51 e) -1.52 22.(5 pts) The pH of a 0.030 M HCl solution at 25

23. (5 pts) What is the pH of a 0.053 M solution of Ca(OH)

? 2

a) 1.30 b) 12.7 c) 0.97 d) 13.0 e) -0.97

24. (5 pts) A sample of freshly pressed apple juice has a pH of 3.76. Calculate [H+].

-4-2-3-3 a) 3.76 b) 1.7 x 10 c) 2.5 x 10 d) 2.9 x 10 e) 3.76 x 10

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