hw4 - Killough Ian Homework 4 Due Oct 5 2006 4:00 pm Inst...

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Killough, Ian – Homework 4 – Due: Oct 5 2006, 4:00 pm – Inst: Donna C Lyon 1 This print-out should have 35 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. This HW assignment is due Sunday, Octo- ber 5, by 4:00 PM. 001 (part 1 of 1) 10 points Which of the following molecules has a dipole moment of zero? 1. H 2 O 2. BCl 2 F 3. NF 3 4. HCl 5. SF 6 correct Explanation: 002 (part 1 of 1) 10 points Methane (CH 4 ) is NOT a polar compound because 1. The statement is false; methane is a polar molecule. 2. it contains no polar bonds. 3. carbon and hydrogen bonds are too simi- lar in electronegativity to form polar bonds. 4. the symmetry of the molecule causes the bond dipoles to cancel one another. correct 5. it contains no unpaired electrons. Explanation: In a polar molecule, the bond dipoles are ar- ranged in such a way that they do not cancel. The methane molecule is symmetrical: C H H H H 003 (part 1 of 1) 10 points The smallest bond angles would be found in a compound with which of the following molec- ular geometry? 1. square planar correct 2. trigonal planar 3. angular 4. pyramidal 5. linear Explanation: Square planar molecular geometry has bond angles of 90 degrees. Trigonal planar molecular geometry has bond angles of 120 degrees. Pyramidal molecular geometry has bond angles of approximately 109.5 degrees. Angular molecular geometry has bond an- gles of approximately 120 degrees. Linear molecular geometry has a bond an- gle of 180 degrees. Square planar has the smallest bond angles. 004 (part 1 of 1) 10 points Which represents a false statement? 1. All molecules with four regions of electron density have sp 3 hybridization. 2. All square planar molecules have octahe- dral electronic arrangements. 3. The sp 2 hybridization corresponds to trig- onal planar electronic arrangements. 4. All angular molecules are sp 2 hybridized. correct Explanation: Angular molecules can be sp 2 or sp 3 hy- bridized. 005 (part 1 of 1) 10 points
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Killough, Ian – Homework 4 – Due: Oct 5 2006, 4:00 pm – Inst: Donna C Lyon 2 What is the name of the molecular geome- try shown below? (The dark circle and each white circle represent an atom.) 1. trigonal planar 2. trigonal pyramidal 3. tetrahedral correct 4. square planar 5. quanternary 6. linear Explanation: This structure fits the general formula AB 4 , where A is a central atom and B atoms are substituents. There are no lone pairs on the central atom of this molecule. AB 4 structures have tetrahedral electronic and molecular ge- ometries. 006 (part 1 of 3) 10 points What is the electronic geometry of IF + 4 ? 1. octahedral 2. tetrahedral 3. T-shaped 4. trigonal planar 5. trigonal bipyramidal correct Explanation: 007 (part 2 of 3) 10 points What is the molecular geometry of IF + 4 ?
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