Fall 09 Chem 3 test

Fall 09 Chem 3 test - CHM2045 Exam 3 (Gower, Mitchell,...

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CHM2045 Exam 3 (Gower, Mitchell, Harrison, Ucak) Form Code A November 16, 2009 Instructions : On your scantron, enter your name, UF ID number, section number, and Form Code (see above). Mark your answers on your exam sheet and keep it for later reference - turn in only your scantron. Bubbling errors of any kind will count as an incorrect response and result in loss of points. Potentially useful information: R = 0.0821 L•atm/mol•K and R = 8.314 J/mol•K MO sequence (core and valence): σ 1s < σ* 1s < σ 2s < σ* 2s < π 2py = π 2pz < σ 2px < π* 2py = π* 2pz < σ* 2px 1. Predict the hybridization of the central atom in each of the following molecules: H 2 CCCH 2 ; IF 4 1– ; IF 4 1+ ; CH 2 O (1) sp 3 d ; sp 2 ; sp ; sp 3 d 2 (2) sp ; sp 3 d 2 ; sp 2 ; sp 3 d (3) sp ; sp 3 d ; sp 2 ; sp 3 d 2 (4) sp 3 d 2 ; sp 3 d ; sp 2 ; sp (5) sp ; sp 3 d 2 ; sp 3 d ; sp 2 2. According to molecular orbital theory, what is the bond order of N 2 1– , C 2 2– , and B 2 2+ , respectively? (1) 1, 2, 0 (2) 5/2, 3, 0 (3) 2, 3, 1 (4) 5/2, 2, 1/2 (5) 3/2, 3, 0 3. Iridium (Ir) has a face-centered cubic crystal structure and has an atomic radius of 136 pm. Calculate the density of iridium. (1) 32.5 g/cm 3 (2) 22.4 g/cm 3 (3) 19.3 g/cm 3 (4) 18.7 g/cm 3 (5) 17.6 g/cm 3 4. Carbon tetrachloride, CCl 4 , has a vapor pressure of 213 mmHg at 40°C and a vapor pressure of 836 mmHg at 80°C. What is the normal boiling point (at 760 mmHg) of CCl 4 ? (1) 40°C (2) 57°C (3) 68°C (4) 77°C (5) 80°C 5. In each of the following groups of substances, pick the one that has the given property, respectively: I. highest boiling point: HBr, Kr, Cl 2 II. highest freezing point: H 2 O, LiBr, HF III. lowest vapor pressure at 25°C: Cl 2 , Br 2 , I 2 , At 2 IV. lowest freezing point: N 2 , CO, CO 2 (1) HBr, LiBr, I 2 , N 2 (2) HBr, H 2 O, I 2 , N 2 (3) HBr, LiBr, At 2 , CO (4) HBr, LiBr, At 2 , N 2 (5) HBr, LiBr, I 2 , CO 6. All of the following statements concerning molecular orbital (MO) theory are correct EXCEPT:
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Fall 09 Chem 3 test - CHM2045 Exam 3 (Gower, Mitchell,...

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