Homework 4-solutions

Homework 4-solutions - wolf(bw7658 Homework 4 sutclie(50965...

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wolf (bw7658) – Homework 4 – sutcliFe – (50965) 1 This print-out should have 20 questions. Multiple-choice questions may continue on the next column or page – ±nd 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 10.0 points Which of the following is the correct Lewis structure of hydroxylamine (NH 2 OH)? 1. N b H H O H 2. N H H O b b H 3. N H O H H 4. N H H O b b H correct Explanation: 002 10.0 points How many double and triple bonds are in the compound CH 2 CCHCH 2 CCH? 1. 1 double, 2 triple 2. 0 double, 3 triple 3. 2 double, 1 triple correct 4. 2 double, 2 triple 5. 4 double, 0 triple Explanation: C H H C C H C H H C C H 003 10.0 points The ion Be² has a total of ? shared electrons and ? non-bonded electrons. 1. 4; 8 2. 4; 4 3. 4; 2 4. 2; 8 correct 5. 6; 2 6. 2; 2 7. 2; 3 8. 6; 3 9. 2; 4 Explanation: Be is one of the exceptions to the octet rule. The total number of valence electrons is Be 1 × 2 e = 2 e ² 1 × 7 e = 7 e - 1 charge +1 e = 1 e 10 e The Lewis Dot structure is b Be ² b b B 004 10.0 points
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wolf (bw7658) – Homework 4 – sutcliFe – (50965) 2 Which of these substances has a formula incorporating a triple bond? 1. C 2 ± 2 correct 2. BCl 3 3. AlCl 3 4. 3 5. HOBr 6. H 2 CO 7. HOCl 8. BI 3 9. H 2 S 10. HOI Explanation: The structure for C 2 ± 2 is C · · · · ·· F C · · · · F Each C brings in 4 valence e and each ± brings in 7, for a total of 22 e . The octet rule is satis²ed for each atom. 005 10.0 points Draw the Lewis structures for I± 7 and Br± + 2 . How many electrons surround the cen- tral atom on I± 7 and on Br± + 2 , respectively? 1. 8 and 14 2. 12 and 8 3. 12 and 14 4. 14 and 8 correct 5. 8 and 12 6. None of these 7. 14 and 12 Explanation: The Lewis Structures are I ± b ± ± ± b b b b b b ± ± ± and b Br ± b b b b b b ± b b b b B + 006 10.0 points Anthracene has the formula C 14 H 10 . It is similar to benzene but has 3 six-membered rings that share common C C bonds: C C C C C C H H H H C C C C H H C C C C H H H H Complete the structure by satisfying the octet rule at each carbon atom. How many resonant structures are possible?
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Homework 4-solutions - wolf(bw7658 Homework 4 sutclie(50965...

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