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Chapter 8, Problem 8.3E

Classify the following processes as exergonic or endergonic. Explain your answers.

a. Any combustion process

b. Perspiration evaporation from the skin

c. Melted lead solidifying

d. An explosive detonating

e. An automobile being pushed up a slight hill (from point of view of the automobile)

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The acid-base indicator HX undergoes the following reaction in a dilute aqueous solution: HX (color 1) H+ + X- (color 2). The following absorbance data were obtained for a 0.00035 M solution of HX in 0.1 M NaOH and 0.1 M HCI. Measurements were made at wavelengths of 450 nm and 620 nm using a 1.0 cm glass cuvette. 450 620 A(460 nm) A(630 nm) 0.1 M NaOH 0.1 M HCI 0.065 0.435 0.895 0.150 In the 0.1M NaOH solution, the indicator will be almost 100% in the X- form, while in 0.1M HCI, the indicator will be nearly 100% protonated (HX). Calculate the acid dissociation constant for the indicator if a pH=5 buffer solution containing a very small amount of indicator exhibits an absorbance of 0.567 at 450 nm and 0.395 at 620 nm (measured in a 1 cm glass cuvette).

Chapter 8 Solutions

Bundle: Chemistry for Today: General, Organic, and Biochemistry, Loose-Leaf Version, 9th + LMS Integrated OWLv2, 4 terms (24 months) Printed Access Card

Ch. 8 - Classify the following processes according to...Ch. 8 - Describe the observations or measurements that...Ch. 8 - Prob. 8.13ECh. 8 - Consider the following hypothetical reaction: A+BC...Ch. 8 - Consider the following hypothetical reaction: A+BC...Ch. 8 - A reaction generates chlorine gas (Cl2) as a...Ch. 8 - A reaction generates hydrogen gas (H2) as a...Ch. 8 - Prob. 8.18ECh. 8 - Prob. 8.19ECh. 8 - In each of the following, which reaction mechanism...Ch. 8 - Which reaction mechanism assumptions are...Ch. 8 - Prob. 8.22ECh. 8 - Sketch energy diagrams to represent each of the...Ch. 8 - Prob. 8.24ECh. 8 - Use energy diagrams to compare catalyzed and...Ch. 8 - Prob. 8.26ECh. 8 - The following reactions are proposed. Make a rough...Ch. 8 - Prob. 8.28ECh. 8 - Prob. 8.29ECh. 8 - Suppose you are running a reaction and you want to...Ch. 8 - A reaction is started by mixing reactants. As time...Ch. 8 - A reaction is run at 10C and takes 3.7hours to go...Ch. 8 - What factor is more important than simply the...Ch. 8 - Prob. 8.34ECh. 8 - Describe the establishment of equilibrium in a...Ch. 8 - Prob. 8.36ECh. 8 - Prob. 8.37ECh. 8 - Colorless hydrogen gas (H2) and red-brown colored...Ch. 8 - Colorless N2O4 gas decomposes to form red-brown...Ch. 8 - Prob. 8.40ECh. 8 - Write an equilibrium expression for each of the...Ch. 8 - Prob. 8.42ECh. 8 - Prob. 8.43ECh. 8 - Prob. 8.44ECh. 8 - Prob. 8.45ECh. 8 - A sample of gaseous BrCl is allowed to decompose...Ch. 8 - At 600C, gaseous CO and Cl2 are mixed together in...Ch. 8 - A mixture of the gases NOCl, Cl2 and NO is allowed...Ch. 8 - Consider the following equilibrium constants....Ch. 8 - Prob. 8.50ECh. 8 - Use Le Chteliers principle to predict the...Ch. 8 - Use Le Chteliers principle to predict the...Ch. 8 - Use Le Chteliers principle to predict the...Ch. 8 - Prob. 8.54ECh. 8 - Tell what will happen to each equilibrium...Ch. 8 - Tell what will happen to each equilibrium...Ch. 8 - The gaseous reaction 2HBr(g)H2(g)+Br2(g) is...Ch. 8 - Prob. 8.58ECh. 8 - Prob. 8.59ECh. 8 - Prob. 8.60ECh. 8 - Prob. 8.61ECh. 8 - Prob. 8.62ECh. 8 - Prob. 8.63ECh. 8 - Prob. 8.64ECh. 8 - Prob. 8.65ECh. 8 - Prob. 8.66ECh. 8 - Refer to Figure 8.10 and answer the questions....Ch. 8 - Refer to Figure 8.13 and answer the questions....Ch. 8 - Prob. 8.69ECh. 8 - Prob. 8.70ECh. 8 - Suppose you have two identical unopened bottles of...Ch. 8 - Someone once suggested that it is impossible to...Ch. 8 - A reaction takes place between an acid and...Ch. 8 - If the reaction:A+BC+D is designated as first...Ch. 8 - Prob. 8.75ECh. 8 - A book is held 6 feet above the floor and then...Ch. 8 - Prob. 8.77ECh. 8 - Prob. 8.78ECh. 8 - Prob. 8.79ECh. 8 - Prob. 8.80ECh. 8 - Prob. 8.81ECh. 8 - Which of the following is the best example of...Ch. 8 - Which is NOT an example of an endothermic change?...Ch. 8 - Which of the following processes is endothermic?...Ch. 8 - Which sentence best describes the following...Ch. 8 - By which of the following mechanisms does a...Ch. 8 - Which of the following is NOT true of reversible...Ch. 8 - Given the reaction: 2CO(g)+O2(g)2CO2(g) When there...Ch. 8 - Prob. 8.89ECh. 8 - Consider the reaction N2(g)+3H2(g)2NH3(g)+heat....Ch. 8 - Prob. 8.91ECh. 8 - Prob. 8.92ECh. 8 - For the reaction: H2(g)+Br2(g)2HBr(g), the...Ch. 8 - Prob. 8.94E

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