Chem 155 Homework Assignment for Week 8: Chapter 16-17 Problems and Additional Questions -, Assignments of Chemistry

Download Chem 155 Homework Assignment for Week 8: Chapter 16-17 Problems and Additional Questions - and more Assignments Chemistry in PDF only on Docsity! Chem 155 W08 Chem 155 Homework #9 Due at the start of class on Mon. March 10 Reading: Finish Chapter 16, begin Chapter 17 (note—you should try to read ALL of chapter 17 before the last day of lecture on March 16). Chapter 15 Problems: DeBroglie turned over in his grave after the midterm! 15.31 Chapter 16 Problems: 16.5 16.8 16.10 16.12 16.16 16.17 16.18 16.22 16.28 16.39 Chapter 17 Problems: 17.1 17.2 17.13 17.15 Additional Problems: 1) When we breath in air, O2 is taken up in the blood by the protein hemoglobin, which contains Fe 2+ ions bound to a heme group [(heme)Fe 2+ ]. The iron-heme reversibly binds O2 , picking it up and releasing it in the other tissues (see Oxtoby, pp. 284-286). In the bound form (oxygenated heme), one electron is transferred from the iron to the O2 so that this species can be described as [(heme)Fe 3+ (O2 - )]. Is the oxygen-oxygen bond length in heme longer or shorter than the bond in O2. Explain. 2) A quantum cascade laser is a laser that emits light when electrons make transitions between levels in artificial quantum wells grown in a semiconductor chip. Treat the energies as a 1D ‘particle-in-an-infinite-box’ problem and assume the laser action occurs between the n=3 and n=2 levels in wells that are 2.5 nm wide. What wavelength of light is emitted? What part of the spectral region is this? Suggest how a chemist might use such a laser to make a measurement. 3) Discuss the experimental evidence supporting the existence of molecular orbitals. Explain how a chemist might measure the energy of an electron in a particular molecular orbital.