Homework 4-solutions

Homework 4-solutions - dewitt(aad777 – Homework 4 –...

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Unformatted text preview: dewitt (aad777) – Homework 4 – sutcliffe – (52380) 1 This print-out should have 18 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. Hints for this assignment: Remember what you learned in the last one! Remember which elements violate the octet rule by having in- complete octets, and which have expanded octets. If unsure a good rule of thumb is to only make the central atom violate the octet rule. If the question says ’shape’ it means ’molecular shape’ or molecular geometry. If it asks for electron arrangement it means the electronic geometry. 001 (part 1 of 2) 10.0 points Draw the Lewis structure for CI 4 . How many single bonds, double bonds, triple bonds, and unshared pairs of electrons are on the central atom, in that order? 1. 2, 0, 0, 2 2. 3, 0, 0, 1 3. 1, 0, 1, 0 4. 0, 1, 1, 0 5. None of these 6. 2, 1, 0, 0 7. 0, 0, 1, 1 8. 1, 1, 0, 1 9. 0, 2, 0, 0 10. 4, 0, 0, 0 correct Explanation: Lewis structure = ? C has 4 valence electrons and I has 7 va- lence electrons. The total number of valence electrons in the molecule is 4 + (4 × 7) = 4 + 28 = 32 The Lewis structure for CI 4 is b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b I C I I I and the central atom has four single bonds. 002 (part 2 of 2) 10.0 points Determine the molecular geometry of CI 4 . 1. trigonal-pyramidal 2. trigonal-bipyramidal 3. octahedral 4. linear 5. trigonal-planar 6. bent or angular 7. None of these 8. tetrahedral correct Explanation: molecular geometry of CI 4 = ? The central atom C has 4 bonding pairs and no lone pairs of electrons. The four areas of high electron density make the electronic geometry tetrahedral and the molecular ge- ometry tetrahedral. C I I I I 003 10.0 points What is the shape of BrO − 4 ? 1. tetrahedral correct 2. trigonal bipyramidal 3. T-shaped dewitt (aad777) – Homework 4 – sutcliffe – (52380) 2 4. square planar 5. seesaw Explanation: There are four regions of electron density (and no lone pairs) around the central atom: Br O b b b b O b b b b O b b b b O b b b b b b − 004 10.0 points Which of the following is planar? 1. NH 3 2. PF 3 3. NO − 3 correct 4. H 3 O + 5. SO 2 − 3 Explanation: All except the nitrate ion have trigonal pyramidal molecular geometries; the nitrate ion has trigonal planer geometry....
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Homework 4-solutions - dewitt(aad777 – Homework 4 –...

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