MT2 2011 ANS

MT2 2011 ANS - Page 1 of 8 Chemistry 121 The University of...

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Page 1 of 8 Chemistry 121 The University of British Columbia Midterm Examination II November 16, 2011 ANSWER KEY Part 1. Multiple Choice (14 marks total) For each numbered statement below, circle the letter that corresponds to the best answer. There is only one correct answer per question. Each question is worth 2 marks. 1. Which one of the following orbitals is lowest in energy in a Li 2+ ion? (a) 37 s (b) 12 p z (c) 2 d x 2 -y 2 (d) 5 f xyz (e) 4 d xz 2. Arrange the following species in order of decreasing melting point: CH 3 OH ClBr S 8 Al Ar (a) S 8 > CH 3 OH > ClBr> Ar > Al (b) Al > ClBr > CH 3 OH > S 8 > Ar (c) S 8 > Al > ClBr > CH 3 OH > Ar (d) Al > S 8 > CH 3 OH > ClBr > Ar (e) CH 3 OH > ClBr > S 8 > Ar > Al 3. For a particular orbital of a hydrogen atom, there is a region of space where the wavefunction has a negative phase. Which one of the following statements is true? (a) The oxidation state of the atom must be less than zero. (b) Only destructive interference of the wavefunction can occur in that region. (c) The wavefunction must correspond to a lobe of a p -orbital. (d) There is a chance of finding the electron in that region of the orbital. (e) The atom must be growing a moustache for Movember.
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Page 2 of 8 4. Which one of the following sets of quantum numbers {n, l , m l ,} would specify a wavefunction ψ n, l , m l (r, θ , φ ) that is a solution to the Schrödinger equation? (a) {5, 2, -7} (b) {8, 1, -1} (c) {6, 6, -2} (d) {0, 0, 0} (e) {4, -2, 1} 5. Which of the following is not used or produced in the process to obtain white phosphorus? (a) NaOH (b) CO (c) SiO 2 (d) C (e) Ca 3 (PO 4 ) 2 6. The melting point (mp) of xenon is -112 ˚C and the boiling point (bp) of xenon is -108 ˚C. The melting and boiling points of radon (Rn) are: (a) mp = -137 ˚C; bp = -118 ˚C (b) mp = -122 ˚C; bp = - 110 ˚C (c) mp = -35 ˚C; bp = 42 ˚C (d) mp = -71 ˚C; bp = -62 ˚C (e) mp = -53 ˚C; bp = - 57 ˚C 7. A chemist shines a light on a metal surface, but no electrons are ejected. In order to make electrons eject from the surface of the metal, the chemist should:
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MT2 2011 ANS - Page 1 of 8 Chemistry 121 The University of...

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