Chemistry: The Central Science, Books a la Carte Edition & Solutions to Red Exercises for Chemistry & Mastering Chemistry with Pearson eText -- Access Card Package

1st Edition

ISBN: 9780134024516

Author: Theodore E. Brown, H. Eugene LeMay, Bruce E. Bursten, Catherine Murphy, Patrick Woodward, Matthew E. Stoltzfus

Publisher: PEARSON

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Textbook Question

Chapter 2, Problem 30E

The rates of many atmospheric reactions are accelerated by the absorption of light by one of the reactants. For example, consider the reaction between methane and chlorine to produce methyl chloride and hydrogen chloride:

Reaction 1: CH₄ (g) + C1₂ (g) → CH₃ C1 (g) + HC1 (g)
This reaction is very slow in the absence of light. However, C1₂ (g) can absorb light to form C1 atoms:

Reaction 2: C1₂ (g) + hv → 2C1 (g)
Once the C1 atoms are generated, they can catalyze the reaction of CH₄ and C1₂_, according to the following proposed mechanism:

Reaction 3: CH₄ (g) + C1 (g) → CH₃ C1 (g) + HC1 (g)
Reaction 1: CH₃ (g) + C1₂ (g) → CH₃ C1 (g) + C1 (g)
The enthalpy changes and activation energies for these two reactions are tabulated as follows:

Reaction	ΔH⁰(KJ/mol)	E_a (KJ/mol)
3	+4	17
4	--109	4

By using the bond enthalpy for C1₂ (Table 8.4), determine the longest wavelength of light that is energetic enough to cause reaction 2 to occur. In which portion of the electromagnetic spectrum is this light found? (b) By using the data tabulated here, sketch a quantitative energy profile for the catalyzed reaction represented by reactions 3 and 4. (c) By using bond enthalpies, estimate where the reactants, CH₄ (g) + C1₂ (g), should be placed on your diagram in part (b). Use this result to estimate the value of E_a for the reaction CH₄ (g) + C1₂ (g) → CH₃ C1 (g) + C1 (g). (d) The species C1 (g) and CH₃ (g) in reactions 3 and 4 are radicals, that is. Atoms or molecules with unpaired electrons. Draw a Lewis structure of CH₃, and verify that it is radical. (e) The sequence of reactions 3 and 4 comprises a radical chain mechanism. Why do you think this is called a “chain reaction”? Propose a reaction that will terminate the chain reaction.

Formula Formula Bond dissociation energy (BDE) is the energy required to break a bond, making it an endothermic process. BDE is calculated for a particular bond and therefore consists of fragments such as radicals since it undergoes homolytic bond cleavage. For the homolysis of a X-Y molecule, the energy of bond dissociation is calculated as the difference in the total enthalpy of formation for the reactants and products. X-Y → X + Y BDE = Δ H f X + Δ H f Y – Δ H f X-Y where, ΔHf is the heat of formation.

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Chapter 2, Problem 29E

Chapter 2, Problem 31E

Chapter 2 Solutions

Chemistry: The Central Science, Books a la Carte Edition & Solutions to Red Exercises for Chemistry & Mastering Chemistry with Pearson eText -- Access Card Package

Ch. 2.3 - Prob. 2.1.1PE Ch. 2.3 - Prob. 2.1.2PE Ch. 2.3 - Prob. 2.2.1PE Ch. 2.3 - Prob. 2.2.2PE Ch. 2.3 - Prob. 2.3.1PE Ch. 2.3 - Prob. 2.3.2PE Ch. 2.4 - Practice Exercise 1 The atomic weight of copper,...Ch. 2.4 - Prob. 2.4.2PE Ch. 2.5 - Prob. 2.5.1PE Ch. 2.5 - Prob. 2.5.2PE

Ch. 2.6 - 11.93 The vapor pressure of ethanol (C2H5OH) at 19...Ch. 2.6 - Prob. 2.6.2PE Ch. 2.7 - Prob. 2.7.1PE Ch. 2.7 - Prob. 2.7.2PE Ch. 2.7 - Prob. 2.8.1PE Ch. 2.7 - Consider the two-dimensional square lattice of...Ch. 2.7 - Prob. 2.9.1PE Ch. 2.7 - Given the ionic radii and molar masses of Sc3+...Ch. 2.7 - Prob. 2.10.1PE Ch. 2.7 - Prob. 2.10.2PE Ch. 2.8 - Prob. 2.11.1PE Ch. 2.8 - Prob. 2.11.2PE Ch. 2.8 - Prob. 2.12.1PE Ch. 2.8 - Prob. 2.12.2PE Ch. 2.8 - Prob. 2.13.1PE Ch. 2.8 - The table below shows the normal boiling points of...Ch. 2.8 - Prob. 2.14.1PE Ch. 2.8 - Prob. 2.14.2PE Ch. 2.9 - Prob. 2.15.1PE Ch. 2.9 - Prob. 2.15.2PE Ch. 2 - Prob. 1E Ch. 2 - At 280C, raw milk sours in 4.0 h but takes 48 h to...Ch. 2 - At 900 o C, Kc = 0.0108 for the reaction CaCO3(g) ...Ch. 2 - Calculate the molar concentration of OH- in a...Ch. 2 - Pyridinium bromide (C5H5NHBr) is a strong...Ch. 2 - Prob. 6E Ch. 2 - Prob. 7E Ch. 2 - Prob. 8E Ch. 2 - Prob. 9E Ch. 2 - Indicate whether each statement is true or false:...Ch. 2 - Prob. 11E Ch. 2 - Prob. 12E Ch. 2 - Prob. 13E Ch. 2 - At 20 oC, the vapor pressure of benzene (C6 H6) is...Ch. 2 - Summarize the evidence used by J. J. Thomson to...Ch. 2 - Prob. 16E Ch. 2 - Prob. 17E Ch. 2 - Prob. 18E Ch. 2 - Suppose the rate law for the reaction in this...Ch. 2 - Practice Exercise 1 Using the data in Sample...Ch. 2 - Which of the following linear plots do you expect...Ch. 2 - A flask is charged with 0.100 mol of A and allowed...Ch. 2 - Prob. 23E Ch. 2 - Prob. 24E Ch. 2 - Prob. 25E Ch. 2 - Prob. 26E Ch. 2 - The addition of No accelerates the decomposition...Ch. 2 - Prob. 28E Ch. 2 - Prob. 29E Ch. 2 - The rates of many atmospheric reactions are...Ch. 2 - Prob. 31E Ch. 2 - Prob. 32E Ch. 2 - Prob. 33E Ch. 2 - 15.23 The equilibrium constant for the...Ch. 2 - A mixture of 0.10 mol of NO, 0.050 mol of H2, and...Ch. 2 - Prob. 36E Ch. 2 - Prob. 37E Ch. 2 - Prob. 38E Ch. 2 - Prob. 39E Ch. 2 - Prob. 40E Ch. 2 - Practice Exercise 1 Order the following three...Ch. 2 - Practice Exercise 1 What is the pH of a 0.28 M...Ch. 2 - Prob. 43E Ch. 2 - Which of the following diagrams best represent an...Ch. 2 - Prob. 45E Ch. 2 - Prob. 46E Ch. 2 - Prob. 47E Ch. 2 - Prob. 48E Ch. 2 - Prob. 49E Ch. 2 - 16.72 Calculate the molar concentration of OH- in...Ch. 2 - Prob. 51E Ch. 2 - Prob. 52E Ch. 2 - Prob. 53E Ch. 2 - Prob. 54E Ch. 2 - a. Given that Ka for acetic acid is 1.8 10-5 and...Ch. 2 - 16.78 a. Given that Kb for ammonia is 1.8 X 10 -5...Ch. 2 - Prob. 57E Ch. 2 - Prob. 58E Ch. 2 - Prob. 59E Ch. 2 - Prob. 60E Ch. 2 - Prob. 61E Ch. 2 - Prob. 62E Ch. 2 - 16.86 An unknown salt is either KBr, NH4 C1, KCN,...Ch. 2 - Prob. 64E Ch. 2 - Prob. 65E Ch. 2 - 16.89 Based on their compositions and structures...Ch. 2 - Prob. 67E Ch. 2 - 16.91 Indicate whether each of the following...Ch. 2 - Prob. 69E Ch. 2 - Prob. 70E Ch. 2 - Prob. 71E Ch. 2 - Prob. 72E Ch. 2 - Prob. 73E Ch. 2 - Prob. 74E Ch. 2 - Prob. 75E Ch. 2 - Prob. 76E Ch. 2 - Prob. 77E Ch. 2 - Prob. 78E Ch. 2 - Prob. 79E Ch. 2 - Benzoic acid (C6H5COOH) and aniline (C6H5NH2) are...Ch. 2 - Prob. 81E Ch. 2 - Prob. 82E Ch. 2 - Prob. 83E Ch. 2 - Butyric acid is responsible for the foul smell of...Ch. 2 - Prob. 85E Ch. 2 - Prob. 86E Ch. 2 - Prob. 87AE Ch. 2 - 1S.113 Many moderately large organic molecules...Ch. 2 - Prob. 89AE Ch. 2 - Prob. 90AE Ch. 2 - Prob. 91AE Ch. 2 - Prob. 92AE Ch. 2 - Prob. 93AE Ch. 2 - 16.120 At 50 oC, the ion-product constant for H2...Ch. 2 - Prob. 95AE Ch. 2 - Prob. 96AE Ch. 2 - Prob. 97AE Ch. 2 - Prob. 98AE Ch. 2 - Prob. 99AE Ch. 2 - Which two statements about gas mixtures are true?...Ch. 2 - Prob. 101AE Ch. 2 - 13.6 If you compare the solubilities of the noble...Ch. 2 - Prob. 103AE Ch. 2 - Prob. 104AE Ch. 2 - Suppose you had a balloon made of some highly...Ch. 2 - Prob. 106AE Ch. 2 - Indicate whether each statement is true or false:...Ch. 2 - Indicate the type of solute-solvent interaction...Ch. 2 - An ionic compound has a very negative H soln in...Ch. 2 - Prob. 110AE Ch. 2 - Prob. 111AE Ch. 2 - The solubility of Cr (NO3)3 . 9 H2O in water is...

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