chem 2.pdf

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Department
Chemistry
Course
CHEM 121
Professor
Debra Pentecost
Semester
Fall

Description
Page 1 of 10 Chemistry 121 The University of British Columbia Midterm Examination II Put the first letter November 16, 2011 of your family/last Time: 60 minutes name in this box. Family/Last Name (printed):______________________ Please check √ your lecture section: First Name: ___________________________________ ___101 (MWF 1:00) MacLachlan ___102 (MWF 2:00) Wolf Signature:_____________________________________ ___103 (MWF 3:00) New ___110 (MWF 10:00) New Student Number:_______________________________ ___111 (MWF 11:00) MacLachlan ___122 (T,Th 2:00) Kunz ___133 (T,Th 3:30) MacFarlane ___188 (T,Th 8:00) Kunz ___199 (T,Th 9:30) Mehrkhodavandi INSTRUCTIONS 1. Write all answers on this examination paper, and show full details of your solutions for Part 2. 2. Read each question carefully. 3. Check that this examination consists of 10 PAGES PRINTED ON BOTH SIDES. 4. The only calculator allowed is the Sharp EL-510R. All other calculators will be confiscated. Cell phones or other electronic communication devices are not permitted. 5. Unassembled molecular model kits may be used. RULES GOVERNING FORMAL EXAMINATIONS 1. Each candidate must be prepared to produce, upon request, a UBCcard for identification. 2. Candidates are not permitted to ask questions of the invigilators, except in cases of supposed errors or ambiguities in examination questions. 3. No candidate shall be permitted to enter the examination room after the expiration of 15 minutes from the scheduled starting time, or to leave during the first 15 minutes of the examination. 4. Candidates suspected of any of the following, or similar, dishonest practices shall be immediately dismissed from the examination and shall be liable to disciplinary action: ▪ having at the place of writing any books, papers or memoranda, calculators, computers, sound or image players/recorders/transmitters (including telephones), or other memory aid devices, other than those authorized by the examiners; ▪ speaking or communicating with other candidates; and ▪ purposely exposing written papers to the view of other candidates or imaging devices. The plea of accident or forgetfulness shall not be received. 5. Candidates must not destroy or mutilate any examination material; must hand in all examination papers; and must not take any examination material from the examination room without permission of the invigilator. 6. Candidates must follow any additional examination rules or directions communicated by the instructor or invigilator. Page 2 of 10 Marks Question Possible Marks Marks Part 1 14 2 1 6 2 8 3 2 4 6 5 6 6 4 7 6 8 8 Total 60 Page 3 of 10 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) 37s (b) 12p z (c) 2dx -y (d) 5fxyz (e) 4d xz 2. Arrange the following species in order of decreasing melting point: CH O3 ClBr S 8 Al Ar (a) S 8 > CH 3H > ClBr> Ar> Al (b) Al > ClBr > CH OH > S > Ar 3 8 (c) S 8 Al > ClBr > CH OH >3Ar (d) Al > S >8CH OH 3 ClBr > Ar (e) CH 3OH > ClBr > S > 8r > 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. 4. Which one of the following sets of quantum numbers {n, l, m,} would specify a wavefunction ψ (r,θ,φ) that is a solution to the Schrödinger equation? n, l, ml (a) {5, 2, −7} (b) {8, 1, −1} (c) {6, 6, −2} (d) {0, 0, 0} (e) {4, −2, 1} Page 4 of 10 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) Ca3(PO 4 2 6. The melting point (mp) of xenon is −112 ˚C and the b
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