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Unformatted text preview: Version 114 Exam 2 mccord (50970) 1 This print-out should have 34 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points What is the molecular geometry of SbCl 2 5 ? Antimony (Sb) can be an exception to the octet rule, accepting up to twelve electrons. 1. trigonal bipyramidal 2. square pyramidal correct 3. octahedral 4. seesaw 5. square planar Explanation: 002 10.0 points Which of the following molecules is non- polar? 1. PH 3 2. O 3 3. H 2 O 2 4. XeF 4 correct 5. H 2 O Explanation: XeF 4 is symmetrical and therefore non- polar. Ozone (O 3 ) is the only polar molecule composed of non-polar bonds. The other molecules are all asymmetrical and therefore polar. 003 10.0 points Which of the following is diamagnetic? 1. O 2 2. O + 2 3. O 2 4. O 2 2 correct Explanation: All but O 2 2 are paramagentic (possess un- paired electrons). 004 10.0 points A molecule has two lone non-bonded pairs of electrons on the central atom and four atoms bonded to the central atom. What is its molecular shape and its hybridization? 1. square planar; sp 3 d 2 correct 2. pyramidal; sp 3 3. square pyramidal; sp 3 d 2 4. tetrahedral; sp 3 d 2 5. square planar; sp 3 6. octahedral; sp 3 d 2 7. tetrahedral; sp 3 Explanation: One way to solve is to draw a sample and determine HED. Since HED = 6, you know electronic geometry is octahedral. The lone pairs are placed 180 degrees from each other leaving the molecular geometry square planar and hybridization is sp 3 d 2 . 005 10.0 points Consider the following covalent bond radii: Single Double Triple C 77 pm 67 pm 60 pm N 75 pm 60 pm 55 pm O 74 pm 60 pm- S 102 pm-- What is the approximate length of the NN bond in nitrogen hydride (HNNH) using the table values? 1. 120 pm correct Version 114 Exam 2 mccord (50970) 2 2. 150 pm 3. 135 pm 4. 55 pm 5. 75 pm 6. 110 pm 7. 60 pm Explanation: The bond is a double bond so you add 60 pm to 60 pm and get 120 pm. 006 10.0 points White phosphorus is composed of molecules of P 4 in which each P atom is connected to three other P atoms in the shape of a tetrahe- dron. Does it obey the octet rule? 1. Yes correct 2. Unable to determine 3. No Explanation: From the structure P P P P b b b b b b b b it does obey the octet rule. 007 10.0 points The lattice enthalpy of calcium oxide is the energy change for the reaction 1. CaO(s) Ca(g) + 1 2 O 2 (g) 2. Ca(g) + O(g) CaO(g) 3. CaO(s) Ca 2+ (g) + O 2 (g) correct 4. Ca(s) + 1 2 O 2 (g) CaO(s) 5. CaO(s) Ca(g) + O(g) Explanation: Lattice enthalpy is the energy change at constant pressure when a 1 mole of an ionic solid is broken into ions of its component elements in gaseous form at 298 K, 1 atm....
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This note was uploaded on 04/30/2011 for the course CH 301 taught by Professor Fakhreddine/lyon during the Fall '07 term at University of Texas at Austin.

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solution_pdf2 - Version 114 Exam 2 mccord (50970) 1 This...

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