CH 301 HW 4 Solutions - giang (dvg247) Homework 4 sutclie...

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giang (dvg247) – Homework 4 – sutclife – (50965) 1 This print-out should have 20 questions. Multiple-choice questions may continue on the next column or page – Fnd all choices be±ore answering. Hints ±or 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. I± unsure a good rule o± thumb is to only make the central atom violate the octet rule. I± the question says ’shape’ it means ’molecular shape’ or molecular geometry. I± it asks ±or electron arrangement it means the electronic geometry. 001 10.0 points Which o± the ±ollowing is the correct Lewis structure o± hydroxylamine (NH 2 OH)? 1. N H H O H correct 2. N H H O H 3. N H H O H 4. N H O H H Explanation: 002 10.0 points How many double and triple bonds are in the compound CH 2 CCHCH 2 CCH? 1. 2double,1triple correct 2. 2double,2triple 3. 4double,0triple 4. 0double,3triple 5. 1double,2triple Explanation: C H H C C H C H H CC H 003 10.0 points The ion Be² - has a total o± ? shared electrons and ? non-bonded electrons. 1. 4; 4 2. 4; 8 3. 4; 2 4. 6; 2 5. 2; 3 6. 6; 3 7. 2; 4 8. 2; 8 correct 9. 2; 2 Explanation: Be is one o± the exceptions to the octet rule. The total number o± valence electrons is Be 1 × 2 e - =2 e - ²1 × 7 e - =7 e - - 1charge +1 e - =1 e - 10 e - The Lewis Dot structure is ± Be ² ² - 004 10.0 points
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giang (dvg247) – Homework 4 – sutclife – (50965) 2 Which oF these substances has a Formula incorporating a triple bond? 1. HOCl 2. HO± 3. BCl 3 4. C 2 Cl 2 correct 5. H 2 O 6. 3 7. H 2 CO 8. HOI 9. AlCl 3 10. HOBr Explanation: The structure For C 2 Cl 2 is C ·· · · Cl C · · Cl Each C brings in 4 valence e - and each ± brings in 7, For a total oF 22 e - .T h eo c t e t rule is satis²ed For each atom. 005 10.0 points Draw the Lewis structures For Br± + 2 and 7 .Howmanye lectronssurroundthecen tra l atom on Br± + 2 and on I± 7 ,respect ive ly? 1. 10 and 8 2. 14 and 10 3. 14 and 8 4. 8and10 5. None oF these 6. 8and14 correct 7. 10 and 14 Explanation: The Lewis Structures are ± Br ± ± ² + and I ± ± ± ± ± ± ± 006 10.0 points Anthracene has the Formula C 14 H 10 .I t i s similar to benzene but has 3 six-membered rings that share common C Cbonds: 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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This note was uploaded on 10/26/2010 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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CH 301 HW 4 Solutions - giang (dvg247) Homework 4 sutclie...

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