Koofer - Version 400 Exam 2 MWF sutcliffe (50965) This...

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Version 400 – Exam 2 MWF – sutclife – (50965) 1 This print-out should have 35 questions. Multiple-choice questions may continue on the next column or page – ±nd all choices be²ore answering. PLEASE READ THIS!! This exam is ONLY to be taken by students in Dr. Sut- clife’s MWF 8-9am section. 001 10.0 points Predict the N O bond lengths in NO - 2 , given the N O and N O bond lengths o² 140 and 120 pm, respectively. 1. both 120 pm 2. None o² these 3. single bond: 140 pm; double bond: 120 pm 4. both 130 pm correct 5. both 140 pm Explanation: N O O N O O B.O. = 1.5 002 10.0 points Which o² the ²ollowing has bond angles o² 90 , 120 , and 180 ? 1. IF 5 2. XeF 4 3. PF - 6 4. SF 4 correct 5. ICl - 4 Explanation: Only SF 4 has ±ve regions o² electron density around the central atom; the rest have six. 003 10.0 points In this question assume the octet rule is strictly obeyed. Which o² the ²ollowing exhibits resonance? 1. O 2 2. H 3 O + 3. NO - 3 correct 4. ClO - 3 Explanation: The structure ²or the NO - 3 ion is N · ·· · · · O · · · · · · O · · · · O - This is a resonance structure because the double bond could be placed at any o² the O atoms. 004 10.0 points Which pair o² atoms (ions) is listed in order o² INCREASING radii? 1. S 2 - , Cl - 2. Mg 2+ , Na + correct 3. Mg, Mg 2+ 4. Br - , Cl - Explanation: Ionic radii become larger as you move down a column or as you move ²rom right to left across a row. 005 (part 1 of 2) 10.0 points What is the molecular shape o² the SbF 2 - 5 ion? 1. trigonal pyramidal 2. square pyramidal correct 3. octahedral
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Version 400 – Exam 2 MWF – sutclife – (50965) 2 4. tetrahedral 5. trigonal bipyramidal Explanation: The Lewis structure is Sb F F F F F 2 - . The shape is square pyramidal based on an oc- tahedral arrangement o± electrons about the Sb atom. 006 (part 2 of 2) 10.0 points How many diferent F - Sb - F bond angles are in this molecule? 1. 1 2. 2 correct 3. 4 4. 5 5. 3 Explanation: There are two types o± F - Sb - F angles: 90 (adjacent) and 180 (opposite). 007 10.0 points Classi±y the molecule PBr 3 . 1. nonpolar molecule with polar bonds 2. polar molecule with polar bonds correct 3. polar molecule with nonpolar bonds 4. nonpolar molecule with nonpolar bonds Explanation: 008 10.0 points Which structure is most ±easible ±or sul±ur dioxide? 1. S O O 2. SO O 3. S O O correct 4. O 5. O 6. S O O Explanation: S O O has a ±ormal charge o± zero on all atoms. 009 10.0 points Hint: ’Lowest’ means ’least negative’. I± the ±ollowing crystallize in the same type o± structure, which has the lowest lattice en- ergy? 1. BaO 2. SrO 3. BaS correct 4. SrS 5. CaO Explanation: Lowest charge densities due to larger size. 010 10.0 points A colleague reports to you that a newly syn- thesized three-atom molecule is bent. It is reasonable to believe that the electronic ge- ometry could be which o± the ±ollowing ge- ometries.
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Koofer - Version 400 Exam 2 MWF sutcliffe (50965) This...

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