final exam

final exam - Chemistry 211 Practice Final Exam III h = 6.63...

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Chemistry 211 Practice Final Exam III h = 6.63 x 10 -34 J-s c = 3.0 x 10 8 rn/s R = 0.08206 L-atrn/mol-K STP = 1 atm, 0°C 1 atm =760 torr 1 Which of the following statements concerning VSEPR is NOT true? a) If there are no lone pairs on the central atom, the electronic and molecular geometries are the same. b) "See-saw" is a molecular geometry, but not an electronic geometry. c) "Tetrahedral" is both a molecular and an electronic geometry. d) The electronic geometry with six "Regions of High Electron Density" is octahedral. e) A double bond counts as two regions of high electron density. 2. Which of the following is the molecular geometry of AsF 3 ? a) trigonal bipyramidal b) trigonal planar c) trigonal pyramidal d) tetrahedral e) T-shaped 3. A molecule is trigonal planar and has only single bonds to the central atom. What can be said about the central atom? a) it obeys the octet rule b) it has fewer than 8 electrons c) it has more than 8 electrons d) none of these are definitely true 4. Which of the following molecules is polar, i.e. possesses a dipole moment? a) CO 2 b) PF 3 c) PF 5 d) N 2 e) CF 4 5. Which of the following does NOT have a linear molecular geometry? a) CO 2 b) CS 2 c) H 2 O d) N 2 e) HCl
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6. What is the molecular geometry of BrF 5 ? a) trigonal bipyramidal b) square planar c) square pyramidal d) see-saw e) trigonal pyramidal 7. The compound, AB 3 , has a trigonal bipyramidal electron domain geometry, what is the molecular geometry? a) T-shaped b) trigonal bipyramidal c) trigonal planar d) tetrahedral e) see-saw 8. Which of the following has a tetrahedral molecular geometry? a) CF 4 b) SF 4 c) XeF 4 d) CO 2 e) PF 5 9. The pressure of air inside a certain cold tire (15°C) is 1.50 atm. After the tire warms up on the highway to 30.°C, the volume inside the tire changes slightly, from 2.7 L to 2.8 L. What is the highway pressure inside the tire? a) 1.52 atm b) 2.89 atm c) 1.64 atm d) 3.00 atm e) 1.57 atm 10. The following reaction produced 2.24 L of O 2 collected at STP. How many grams of KClO 3 were originally present? 2 KClO 3 (s) ---> 2 KCl(s) + 3 O 2 (g) a) 8.16 g b) 12.2 g c) 183 g d) 18.36 g e) 6.66 x 10 -2
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11. At STP which of the following species would have the highest average molecular speed? a) O 2 b) NO 2 c) N 2 d) HCI e) all would be the same 12. A 750. mL sample of a pure gaseous compound, measured at 0.00°C and 1.00 atm is found to weigh 2.86 grams. What is the molecular weight (molar mass) of the compound? a) 0.080 g/mol
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This note was uploaded on 02/12/2012 for the course CHM 211 taught by Professor Staff during the Fall '08 term at Marshall.

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final exam - Chemistry 211 Practice Final Exam III h = 6.63...

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