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

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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 – fnd 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. Xe± 4 correct 5. H 2 O Explanation: Xe± 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
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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 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. 008 10.0 points The electronic arrangment is the same as the molecular shape when 1. there are no lone pairs of electrons on the central atom. correct 2. the atoms are joined by sigma bonds.
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