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hw5a - Thomas Phillip Homework 5 Due 11:00 pm Inst Brodbelt...

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Thomas, Phillip – Homework 5 – Due: Oct 17 2007, 11:00 pm – Inst: Brodbelt 1 This print-out should have 21 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. Brodbelt CH301 Homework 5 Due October 17, 2007 at 11:00 PM Please note that the terms electronic ar- rangement and electronic geometry mean the same thing. Also, the terms molecular shape and molecular geometry mean the same thing 001 (part 1 of 1) 10 points NF - 2 has (2, 3, 4) regions of high electron density and (2, 4, 6) bonded electrons. 1. 4; 4 correct 2. 3; 2 3. 2; 6 4. 3; 4 5. 2; 4 6. 4; 2 7. 3; 6 8. 2; 2 9. 4; 6 Explanation: N = 8 × 3 = 25 A = 5 + (7 × 2) + 1 = 20 S = 24 - 20 = 4 First, draw the molecule. The number of regions of HED equals the number of bonds and the number of lone pairs. There are 4 shared, or bonded electrons, giving 2 regions of HED. The 2 F atoms have an octet. This means that 16 of the 20 available electrons are accounted for, leaving 4 electrons to be placed on the N atom as 2 lone pairs. Since there are 2 lone pairs, 2 bonds, that gives a total of 4 regions of HED. 002 (part 1 of 1) 10 points A molecule has one lone non-bonded pair of electrons on the central atom and three atoms bonded to the central atom. What is its electronic arrangement and its hybridization? 1. tetrahedral; sp 3 correct 2. trigonal planar; sp 2 3. tetrahedral; sp 2 4. pyramidal; sp 2 5. trigonal planar; sp 3 6. angular; sp 3 7. pyramidal; sp 3 Explanation: One lone pair plus 3 bonded pairs equals 4 electronic regions. This means that the central atom is tetrahedral and hybridization is sp 3 . 003 (part 1 of 1) 10 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 number of bonding orbitals equals the number of anti-bonding orbitals. 3. there are more shared electrons than non- shared electrons. 4. the atoms are joined by sigma bonds. 5. the molecule is not polar. Explanation: The only time that the molecular shape and electronic arrangement are the same is when there are no lone pairs of electrons on the
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Thomas, Phillip – Homework 5 – Due: Oct 17 2007, 11:00 pm – Inst: Brodbelt 2 central atom.
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