Chemistry: An Atoms First Approach
2nd Edition
ISBN: 9781305079243
Author: Steven S. Zumdahl, Susan A. Zumdahl
Publisher: Cengage Learning
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Textbook Question
Chapter 11, Problem 75E
One mechanism for the destruction of ozone in the upper atmosphere is
a. Which species is a catalyst?
b. Which species is an intermediate?
c. Ea for the uncatalyzed reaction
is 14.0 kJ. Ea. for the same reaction when catalyzed is 11.9 kJ. What is the ratio of the rate constant for the catalyzed reaction to that for the uncatalyzed reaction at 25°C? Assume that the frequency factor A is the same for each reaction.
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Consider the following data for the gas-phase decomposition of
NO₂:
2NO₂ (g) → 2NO(g) + O₂(g)
Temperature
(K)
600
600
700
Initial
[NO₂]
Initial Rate of Decomposition of
NO₂ (M/s)
0.0010
5.4 x 10-7
0.0020
2.2 x 10-6
0.0020 5.2 x 105
▾ Part A
If 5.5x10-3 M of NO₂ is introduced into a 1.0 L flask and allowed to decompose at 680 K, how many seconds does it take for the NO₂ concentration to drop to
1.0x10-² M?
Express your answer using two significant figures.
195] ΑΣΦΑΛΙ
AX
+= 1.5.10³
→
R
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Review | Constants | Periodic Table
S
The overall reaction of ozone reacting to form oxygen has been proposed to occur in a reaction mechanism of:
Step 1: O3(g) O2(g) + O(g)
Step 2: O3(g) + O(g) 2O2(g)
What is the role of O(g) and what is the overall balanced equation?
a.
O(g) is a catalyst;
2O3(g) 3O2(g)
b.
O(g) is a catalyst;
2O3(g) + O(g) 3O 2(g) + O(g)
c.
O(g) is an intermediate;
2O3(g) 3O2(g)
d.
O(g) is an intermediate;
2O3(g) + O(g) 3O2(g) + O(g)
21.Consider the reaction: 3A → 4C
Initially, and at some fixed temperature, the reaction proceeds at such a rate that 200 millimoles of A are consumed in 1 minute and 47 seconds. The reaction takes place in 1.00 L.
Experimental data are expressed in the table below.
t (s)
[A], M
0.00
4.20
10.0
3.20
20.0
2.45
30.0
1.87
40.0
1.42
50.0
1.09
c. Determine the order of the reaction. Is the reaction elementary?
e. Find the rate constant and express the rate law for this reaction.
f. Find the period of time between the 7th half-life and 8th half-life.
Chapter 11 Solutions
Chemistry: An Atoms First Approach
Ch. 11 - Define reaction rate. Distinguish between the...Ch. 11 - Distinguish between the differential rate law and...Ch. 11 - One experimental procedure that can be used to...Ch. 11 - The initial rate for a reaction is equal to the...Ch. 11 - Prob. 5RQCh. 11 - Derive expressions for the half-life of zero-,...Ch. 11 - Prob. 7RQCh. 11 - Prob. 8RQCh. 11 - Prob. 9RQCh. 11 - Give the Arrhenius equation. Take the natural log...
Ch. 11 - Why does a catalyst increase the rate of a...Ch. 11 - Prob. 1ALQCh. 11 - Describe at least two experiments you could...Ch. 11 - Prob. 3ALQCh. 11 - Prob. 4ALQCh. 11 - Consider the following statements: In general, the...Ch. 11 - For the reaction A + B C, explain at least two...Ch. 11 - Prob. 7ALQCh. 11 - Prob. 8ALQCh. 11 - Prob. 9ALQCh. 11 - Prob. 10QCh. 11 - Prob. 11QCh. 11 - The plot below shows the number of collisions with...Ch. 11 - For the reaction O2(g)+2NO(g)2NO2(g) the observed...Ch. 11 - Prob. 14QCh. 11 - Prob. 15QCh. 11 - Prob. 16QCh. 11 - Prob. 17QCh. 11 - Prob. 18QCh. 11 - Prob. 19QCh. 11 - Consider the following energy plots for a chemical...Ch. 11 - Prob. 21QCh. 11 - Would the slope of a ln(k) versus 1/T plot (with...Ch. 11 - Prob. 23ECh. 11 - In the Haber process for the production of...Ch. 11 - At 40C, H2O2 (aq) will decompose according to the...Ch. 11 - Consider the general reaction aA+bBcC and the...Ch. 11 - What are the units for each of the following if...Ch. 11 - The rate law for the reaction...Ch. 11 - The reaction 2NO(g)+Cl2(g)2NOCl(g) was studied at...Ch. 11 - The reaction 2I-(aq)+S2O82-(aq)I2(aq)+2SO42-(aq)...Ch. 11 - The decomposition of nitrosyl chloride was...Ch. 11 - The following data were obtained for the gas-phase...Ch. 11 - The reaction I(aq)+OCl(aq)IO(aq)+Cl(aq) was...Ch. 11 - The reaction 2NO(g)+O2(g)2NO2(g) was studied. and...Ch. 11 - The rote of the reaction between hemoglobin (Hb)...Ch. 11 - The following data were obtained for the reaction...Ch. 11 - The decomposition of hydrogen peroxide was...Ch. 11 - Prob. 38ECh. 11 - The rate of the reaction NO2(g)+CO(g)NO(g)+CO2(g)...Ch. 11 - A certain reaction has the following general form:...Ch. 11 - The decomposition of ethanol (C2H5OH) on an...Ch. 11 - Prob. 42ECh. 11 - The dimerization of butadiene 2C4H6(g)C8H12(g) was...Ch. 11 - The rate of the reaction O(g)+NO2(g)NO(g)+O2(g)...Ch. 11 - Experimental data for the reaction A2B+C have been...Ch. 11 - Prob. 46ECh. 11 - The reaction AB+C is known to be zero order in A...Ch. 11 - The decomposition of hydrogen iodide on finely...Ch. 11 - Prob. 49ECh. 11 - A first-order reaction is 75.0% complete in 320....Ch. 11 - The rate law for the decomposition of phosphine...Ch. 11 - DDT (molar mass = 354.49 g/mol) was a widely used...Ch. 11 - Consider the following initial rate data for the...Ch. 11 - Prob. 54ECh. 11 - Prob. 55ECh. 11 - Prob. 56ECh. 11 - You and a coworker have developed a molecule...Ch. 11 - Consider the hypothetical reaction A+B+2C2D+3E...Ch. 11 - Prob. 59ECh. 11 - A possible mechanism for the decomposition of...Ch. 11 - A proposed mechanism for a reaction is...Ch. 11 - The mechanism for the gas-phase reaction of...Ch. 11 - For the following reaction profile, indicate a....Ch. 11 - Draw a rough sketch of the energy profile for each...Ch. 11 - Prob. 65ECh. 11 - The activation energy for some reaction...Ch. 11 - The rate constant for the gas-phase decomposition...Ch. 11 - The reaction (CH3)3CBr+OH(CH3)3COH+Br in a certain...Ch. 11 - Prob. 69ECh. 11 - A first-order reaction has rate constants of 4.6 ...Ch. 11 - Prob. 71ECh. 11 - Prob. 72ECh. 11 - Which of the following reactions would you expect...Ch. 11 - Prob. 74ECh. 11 - One mechanism for the destruction of ozone in the...Ch. 11 - One of the concerns about the use of Freons is...Ch. 11 - Prob. 77ECh. 11 - The decomposition of NH3 to N2 and H2 was studied...Ch. 11 - The decomposition of many substances on the...Ch. 11 - Prob. 80ECh. 11 - Prob. 81ECh. 11 - Prob. 82ECh. 11 - Consider the following representation of the...Ch. 11 - The reaction H2SeO3(aq) + 6I-(aq) + 4H+(aq) Se(s)...Ch. 11 - Prob. 85AECh. 11 - Sulfuryl chloride (SO2Cl2) decomposes to sulfur...Ch. 11 - For the reaction 2N2O5(g)4NO2(g)+O2(g) the...Ch. 11 - Prob. 88AECh. 11 - Cobra venom helps the snake secure food by binding...Ch. 11 - Iodomethane (CH3I) is a commonly used reagent in...Ch. 11 - Experiments during a recent summer on a number of...Ch. 11 - The activation energy of a certain uncatalyzed...Ch. 11 - Consider the reaction 3A+B+CD+E where the rate law...Ch. 11 - The thiosulfate ion (S2O32) is oxidized by iodine...Ch. 11 - The reaction A(aq)+B(aq)products(aq) was studied,...Ch. 11 - A certain substance, initially present at 0.0800...Ch. 11 - A reaction of the form aAProducts gives a plot of...Ch. 11 - A certain reaction has the form aAProducts At a...Ch. 11 - Which of the following statement(s) is( are) true?...Ch. 11 - Consider the hypothetical reaction A2(g) + B2(g) ...Ch. 11 - Experiments have shown that the average frequency...Ch. 11 - Consider a reaction of the type aA products, in...Ch. 11 - A study was made of the effect of the hydroxide...Ch. 11 - Two isomers (A and B) of a given compound dimerize...Ch. 11 - Prob. 105CPCh. 11 - Most reactions occur by a series of steps. The...Ch. 11 - Prob. 107CPCh. 11 - The decomposition of NO2(g) occurs by the...Ch. 11 - The following data were collected in two studies...Ch. 11 - Prob. 110CPCh. 11 - Prob. 111CPCh. 11 - Prob. 112CPCh. 11 - Sulfuryl chloride undergoes first-order...Ch. 11 - Upon dissolving InCl(s) in HCl, In+(aq) undergoes...Ch. 11 - The decomposition of iodoethane in the gas phase...Ch. 11 - Consider the following reaction: CH3X+YCH3Y+X At...
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- Write a rate law for NO3(g) + O2(g) NO2(g) + O3(g) if measurements show the reaction is first order in nitrogen trioxide and second order in oxygen.arrow_forwardConsider the reaction of ozone and nitrogen monoxide to form nitrogen dioxide and oxygen. O3(g) + NO(g) NO2(g) + O2(g) Which of the following orientations for the collision between ozone and nitrogen monoxide could perhaps lead to an effective collision between the molecules? (a) (b) (c) (d)arrow_forwardDetermine rxnH 25 C for the following reaction: NO g O2 g NO2 g This reaction is a major participant in the formation of smog.arrow_forward
- The reaction for the Haber process, the industrial production of ammonia, is N2(g)+3H2(g)2NH3(g) Assume that under certain laboratory conditions ammonia is produced at the rate of 6.29 ×10-5 molL-1s-1. At what rate is nitrogen consumed? At what rate is hydrogen consumed?arrow_forwardOne mechanism for the destruction of ozone in the upper atmosphere is a. Which species is a catalyst? b. Which species is an intermediate? c. Ea for the uncatalyzed reaction O3(g)+O(g)2O2(g) is 14.0 kJ. Ea. for the same reaction when catalyzed is 11.9 kJ. What is the ratio of the rate constant for the catalyzed reaction to that for the uncatalyzed reaction at 25C? Assume that the frequency factor A is the same for each reaction.arrow_forwardConsider this scenario and answer the following questions: Chlorine atoms resulting from decomposition of chloro?uoromethanes, such as CCI2F2, catalyze the decomposition of ozone in the atmosphere. One simplified mechanism for the decomposition is: O3sunlightO2+O O3+CIO2+CIO CIO+OCI+O2 (a) Explain why chlorine atoms are catalysts in the gas-phase transformation: 2O33O2 (b) Nitric oxide is also involved in the decomposition of ozone by the mechanism: O3sunlightO2+O O3+NONO2+O2 NO2+ONO+O2 Is NO a catalyst for the decomposition? Explain your answer.arrow_forward
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