problem set 1 - Chemistry 312 Please turn in on separate...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Chemistry 312 Please turn in on separate sheets, stapledChemistry together Problem Set 1 (Due beginning of class, Friday, July 1, 2011) 312 Problem Set #1 Due We 1. a. Based on periodic trends, would youperiodicCl2 or I2 to be a you expect Cl2 oragent? a better oxidizing a 1. a. Based on expect trends, would better oxidizing I2 to be Explain. b. Based on periodic trends, would you expect K or Li to be a better reducing ag c. Based on periodic trends, would you expect B or C to have a higher ionization b. Based on periodic trends, would you expect K or Li to be a better reducing agent? 2. Rationalize the following values for successive ionization potentials of boron, w Explain. corresponds to the energy required to remove the Nth electron. c. Based on periodic trends, would you expect B or C to have a higher ionization N 1 2 3 potential? Explain. -1 IP(N) (MJ mol ) 0.807 2.433 3.666 4 25.033 5 32.83 2. Rationalize the following values for successive in first ionization energy (equivwhere 3. Explain the decrease ionization potentials of boron, to ionization potential) for IP(n) corresponds to the energy requiredthe remove the nth electron. nitrogen in to Table of electronic properties contained in Resource Section 2 of Atkins). n 1 2 3 4 5 Table IP(n) (MJ mol1) 0.807 4. Use 2.433 5.2 (from your textbook below), and the water stability (potential vs. 3.666 25.033 32.834 of this problem set, to determine whether the following would be stable in wate the water-derived product that would form in cases where the 3. Explain the decrease in first ionization energy (equivalent to the ionization potential) species would be 3+ a. Co3+ at properties found in2+)= +1.92 V) for oxygen versus nitrogen in the table of electronicpH= 0 (E1/2(Co /Co Resource Section b. Zn0 at pH=2. 2 of Atkins (p. 785). c. Zn2+ at pH=2. 2 d. [IrCl6 the pH= stability (potential vs. pH) 4. Use Atkins' Table 5.2 (reproduced below), and]3 atwater 14. e. [IrCl6 at pH= 14. graph at the end of this problem set, to determine ]whether the following would be stable f. Fe2+ at pH= 0 in water. Explain. If the species is unstable, indicate the water-derived product that would form. a. Co3+ at pH 0 (E1/2(Co3+/Co2+)= +1.92 V) b. Zn0 at pH 2 c. Zn2+ at pH 2 d. [IrCl6]2 at pH 14 e. [IrCl6]3 at pH 14 f. Fe2+ at pH 0 5. The water coupling/dioxygen evolving reaction promoted by photosynthetic organisms The water coupling/dioxygen evolving reaction four-electron photosynthetic organisms (involves the with involves the proton-coupled promoted by oxidation of two water molecules along proton-coupled four electron oxidation of two water molecules).along is theOO bond global process OO bond formation to yield di-oxygen (O2 This with dominant formation to yield dioxygen (O2). This is the dominant global process responsible for replenishing atmospheric responsible for replenishing atmospheric oxygen essential for life. oxygen essential for life. a. What would the redoxWhat would the redox potential reaction site have to be in order to drive to be in a. potential of the photosynthetic of the photosynthetic reaction site have this reaction under physiological conditions (ie pH= 7)? order to drive this reaction under physiological conditions (i.e., pH 7)? b. Would you want to raise or lower the pH in order to make this reaction more favorable? b. Would you want to raise or lower the pH in order to make this reaction more Explain. favorable? Explain. c. The catalytic site that promotes this reaction (O2 formation from H2O) consists of a cluster of c. The catalytic site that promotes this reaction (O2 formation from H2O) consists four Mn ions, in a mixture of +3, +4, and possibly +5 oxidation states. Can you think of a of a cluster of four Mn ions, in a mixture of +3, +4, and possibly +5 oxidation reason why nature would devise such a complex system, when according to Table 5.2 states. Can you think of a reason why nature would devise such a complex (above), MnO4 would capable of promoting this reaction?(above), MnO would capable of system, when according to Table 5.2 4 promoting this reaction? ...
View Full Document

Ask a homework question - tutors are online