2045Exam3Spring2010FormCodeAWithAnswers (1)

2045Exam3Spring2010FormCodeAWithAnswers (1) - CHM2045 Exam...

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CHM2045 Exam 3 (Gower, Mitchell) Form Code A 01 April 2010 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 < σ 2px < π 2py = π 2pz < π* 2py = π* 2pz < σ* 2px 1. Predict the hybridization of the central atom in each of the following molecules: SF 4 : IF 4 1– ; BrF 3 ; 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 3 d ; sp 3 d 2 ; sp 3 d ; sp 2 2. According to molecular orbital theory, what is the bond order of F 2 2- , F 2 1– , F 2 , F 2 1+ and F 2 2+ , respectively? (1) 0; 0.5; 1; 1.5; 0 (2) 0.5; 0.5; 1; 1.5; 2 (3) 1; 0.5; 1; 1.5; 2 (4) 0; 0.5; 1; 1.5; 2 (5) 0, 3/2, 3, 0, 1 3. Copper has a face-centered cubic crystal structure and has an atomic radius of 128 pm. Calculate the density of copper. (1) 32.5 g/cm 3 (2) 22.4 g/cm 3 (3) 8.95 g/cm 3 (4) 18.7 g/cm 3 (5) 17.6 g/cm 3 4. Which one of the following substances will exhibit primarily dipole-dipole intermolecular forces? (1) C 3 H 8 (propane) (2) SO 2 (3) CO 2 (4) XeF 4 (5) AsF 5 5. In each of the following groups of substances, pick the one that has the given property, respectively: I. lowest boiling point: HBr, Kr, Br 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: H 2 , CO, CO 2 (1) HBr, LiBr, I 2 , H 2 (2) HBr, H 2 O, I 2 , H 2 (3) HBr, LiBr, At 2 , CO (4) HBr, LiBr, At 2 , H 2 (5) HBr, LiBr, I 2 , CO 6. Which of the following statements concerning molecular orbital (MO) theory are correct? (I) the Pauli exclusion principle is obeyed (II) Hund's rule is obeyed (III) the combination of two atomic orbitals creates one molecular orbital (IV) a bonding molecular orbital is lower in energy than its parent atomic orbitals (V) electrons are assigned to orbitals of successively higher energy (1) I, II, III and IV (2) I, II, IV and V (3) I, IV, and V (4) III and V
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This note was uploaded on 03/01/2011 for the course CHEM 2046 taught by Professor Gower during the Spring '10 term at University of Florida.

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2045Exam3Spring2010FormCodeAWithAnswers (1) - CHM2045 Exam...

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