Exam3-Practice-Sum10-ANSWERS

Exam3-Practice-Sum10-ANSWERS - Chemistry 111A General...

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Chemistry 111A General Chemistry Practice Exam 3 June 29, 2010 Chapters 9(9.8, 9.9), 10, 5, 11, 12 Name (Print)(Last Name, First Name)________ANSWERS ___________ Signature________________________________________________________ Student ID Lab Section Instructor_____________________________ Useful equations and constants: PV=nRT, M RT 3 u rms = , E=q+w, q=mC s T, E=h ν , λν =c, - × = - 2 f 2 i 18 n 1 n 1 J 10 18 . 2 E , r q q 4 1 E 2 1 0 πε = , - - = 1 2 vap 1 2 T 1 T 1 R H P P ln μ =qr, θ = λ sin d 2 n , gas H gas P k S = , r 1 1 1 P X P = , f f imK T = , iMRT = Π , 760 torr=1 atm, e=1.602 × 10 -19 C, R=8.314 J/mol.K, R=0.08206 L.atm/mol.K, c=3.00 × 10 8 m/s, h=6.63 × 10 -34 Js, N A =6.02 × 10 23 /mol
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Section 1 - Multiple Choice (mark correct answer on Scantron- 3 points each) 1. The electron group geometry and the molecular geometry of a molecule of the general formula AB n will always be the same if a) there are no lone pairs on the central atom b) there is more than one central atom c) n is greater than four d) n is less than four e) the octet rule is obeyed 2. Which of the following molecules has cis and trans isomers? a) CH 2 =CCl 2 b) CH 2 Cl–CH 2 Cl c) CHCl=CH 2 d) CH 3 CH=CHCH 3 e) ClC CH 3. A valid Lewis structure of which of the following cannot be drawn without violating the octet rule. a) PO 4 3– b) SiF 4 c) CF 4 d) SeF 4 e) NF 3 4. The blending of one s atomic orbital and two p atomic orbitals produces a) three sp hybrid orbitals b) two sp 2 hybrid orbitals c) three sp 3 hybrid orbitals d) two sp 3 hybrid orbitals e) three sp 2 hybrid orbitals 5. The carbon-carbon σ bond in ethylene CH 2 =CH 2 , results from the overlap of a) sp 3 hybrid orbitals b) 2s atomic orbitals c) sp hybrid orbitals d) sp 2 hybrid orbitals e) 2p atomic orbitals 6. According to MO theory, overlap of two s atomic orbitals produces a) one bonding molecular orbital and one hybrid orbital b) two bonding molecular orbitals c) two bonding molecular orbitals and two antibonding molecular orbitals d) two bonding molecular orbitals and one antibonding molecular orbital e) one bonding molecular orbital and one antibonding molecular orbital 7. A molecular orbital can accommodate a maximum of __________ electron(s). a) one b) two c) four d) eight e) twelve
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8. Use the bond energies provided to estimate rxn for the reaction below. o 2 2 6 rxn XeF 2 F XeF H ? + = Bond Bond Energy (kJ/mol) Xe-F 147 F-F 159 a) -429 kJ b) +159 kJ c) -660 kJ d) +176 kJ e) -270 kJ 9. A gas is considered "ideal" if a) it is not compressible b) one mole of it occupies exactly 1 liter at standard temperature and pressure c) it can be shown to occupy zero volume at 0 ° C. d)
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This note was uploaded on 11/01/2010 for the course CHEM 12412 taught by Professor Af during the Summer '10 term at CSU Long Beach.

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Exam3-Practice-Sum10-ANSWERS - Chemistry 111A General...

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