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1 CHEM Lab Section Number: Name (printed): Signature: This exam consists of 36 questions all of equal value for a total of 225 points. Make sure that your test has all of the pages. Please read each problem carefully. There are no intentionally misleading questions; each problem should be taken at its face value. Please mark your answers on the Scantron sheet provided to you and on the actual exam. You will be given a periodic table and an exam information sheet to use during the exam. You may remove it from the exam make it more accessible. You may also use the designated Casio fx-300ms-plus calculator or equivalent non-programmable non-graphing scientific calculator during the exam. Use the back pages of the test as scratch paper. You are not allowed to use any devices capable of accessing the internet, textbooks, notes, or homemade reference sheets during the exam. You may leave if you finish the exam early. Give the exam and the information sheet to your TA and leave quietly without disturbing other students. Before leaving, check that all your answers have been properly entered on the Scantron sheet and the exam and that your name is written on every page of the exam and on the Scantron sheet. All cell phones and electronic devices must be turned off and put away. Please remove all hats and caps. Place your books and all papers out of sight under your seat. If the TA believes that you might be looking at your neighbor s paper, you will be asked to move to a new location. Exam scores will be posted on Blackboard as soon as the grading is complete. Your test will be returned to you in the first lab meeting of next week. If you have any questions regarding the grading of your exam, please notify your TA. The time available for the exam is 120 minutes. Good luck! 1 of 12
2 Name: Lab Section #: Please mark your answers on the scantron sheet using a #2 pencil and also mark your answers on the exam itself. Mark Test From A on your scantron. 1. Select the strongest bond in the following group. (a) C=C (b) C N (c) C O (d) C S (e) C F 2. Which one of the following properties is least characteristic of substances composed of small, covalently-bonded molecules? (a) brittle (b) low boiling point (c) poor electrical conductor when solid (d) poor electrical conductor when molten (e) high melting point 3. Select the element whose Lewis dot symbol is correct. (a) (b) (c) (d) (e) 4. In which of these substances are the atoms held together by polar covalent bonding? (a) S8 (b) SrCl2 (c) CsCl (d) CaF2 (e) ClF 2 of 12
3 5. Which of the following contains ionic bonding? (a) SrF2 (b) CO2 (c) H2O (d) HF (e) Al 6. Select the correct formula for a compound formed from calcium and chlorine. (a) CaCl (b) Ca2Cl (c) CaCl (d) CaCl2 (e) CaCl3 7. Select the correct formula for a compound formed from barium and nitrogen. (a) Ba3N2 (b) Ba2N (c) Ba2N3 (d) Ba2N (e) BaN2 8. Select the element with the lowest electronegativity. (a) Li (b) Al (c) Cl (d) Cs (e) Ca 9. Select the element with the highest electronegativity. (a) N (b) P (c) I (d) Fr (e) Be 10. Which one of the following properties is least characteristic of typical ionic compounds? (a) high melting point (b) poor electrical conductor when molten (c) high boiling point (d) brittleness (e) poor electrical conductor when solid 3 of 12
4 11. Select the most polar bond amongst the following. (a) C O (b) Si F (c) Cl F (d) C F (e) C I 12. Select the correct Lewis structure for ClCN. (a) (b) (c) (d) (e) 13. Oxygen difluoride is a powerful oxidizing and fluorinating agent. Select its Lewis structure. (a) (b) (c) (d) (e) None of the above are correct. 14. In which of the following molecules contain a double bond? (a) I2 (b) PCl5 (c) C2H2 (d) N2 (e) CH2O 15. In which of the following is the best Lewis structure a resonance structure? (a) SO3 (b) BF3 (c) I3 (d) SCO (C is the central atom) (e) SO3 2-4 of 12
5 16. The formal charge on Cl in the structure shown for the perchlorate ion is (a) -2 (b) +1 (c) 0 (d) -1 (e) In which one of the following species is the central atom (the first atom in the formula) an exception to the octet rule? (a) SF6 (b) NH3 (c) NH4 + (d) I2 (e) BH4 18. Considering all the bonds in a molecule with trigonal bipyramidal geometry, what are the bond angles present? (a) 120 º only (b) 90 º only (c) 90 º, 120 º, and 180 º (d) 60 º and 90 º only (e) 180 º only 19. What is the molecular shape of BCl3 as predicted by VSEPR theory? (a) linear (b) tetrahedral (c) trigonal planar (d) trigonal pyramidal (e) none of the above 20. What is the molecular shape of NO2 as predicted by the VSEPR theory? (a) bent (b) tetrahedral (c) T-shaped (d) trigonal pyramidal (e) linear 5 of 12
6 21. What is the molecular shape of XeO2F2 as predicted by the VSEPR theory? (a) square planar (b) see-saw (c) tetrahedral (d) square pyramidal (e) octahedral 22. Which one of the following molecules and ions will have a square planar geometry as predicted by the VSEPR theory? (a) PCl3 (b) BF4 (c) XeF4 (d) BrF5 (e) H3O Which one of the following molecules has a zero dipole moment? (a) SO2 (b) CS2 (c) HCl (d) CO (e) Cl2O 24. Carbon uses hybrid orbitals in ClCN. (a) sp 3 d 2 (b) sp 3 d (c) sp 3 (d) sp 2 (e) sp 25. Of the bonds listed below, which is the strongest? (a) A sigma (σ) bond (b) A pi (π) bond (c) A single bond (d) A double bond (e) A triple bond 6 of 12
7 26. Valence bond theory predicts that carbon will use hybrid orbitals in the carbonate anion, CO3 2. (a) sp 3 d 2 (b) sp 3 d (c) sp 3 (d) sp 2 (e) sp 27. Valence bond theory predicts that tin will use hybrid orbitals in SnF5. (a) sp 3 d 2 (b) sp 3 d (c) sp 3 (d) sp 2 (e) sp For the following three (3) questions, use the molecular orbital diagrams below to aid in obtaining your answers. 28. Using the appropriate molecular orbital diagram, for a molecule of Ne2 determine the resulting bond order. (a) 0 (b) 0.5 (c) 1 (d) 1.5 (e) 2 7 of 12
8 29. Which of the following diatomic molecules is paramagnetic? (a) C2 (b) N2 + (c) F2 (d) Ne2 (e) N2 30. For O2 +, how many electrons are in the π2p orbital? (a) 0 (b) 1 (c) 2 (d) 3 (e) A sample of an ideal gas has its volume doubled while its temperature remains constant. If the original pressure was 100 torr, what is the new pressure? (a) 10 torr (b) 50 torr (c) 100 torr (d) 200 torr (e) 1000 torr 32. A sample of nitrogen gas at 298 K and 745 torr has a volume of L. What volume will it occupy if the pressure is increased to 894 torr at constant temperature? (a) 380 L (b) 44.9 L (c) 112 L (d) 31.2 L (e) 22.3 L 33. A sample container of carbon monoxide occupies a volume of 435 ml at a pressure of 785 torr and a temperature of 298 K. What would its temperature be if the volume were changed to 265 ml at a pressure of 785 torr? (a) 182 K (b) 298 K (c) 387 K (d) 489 K (e) 538 K 8 of 12
9 34. A sample of ammonia gas at 65.5 C and 524 torr has a volume of L. What is its volume when the temperature is 15.8 C and its pressure is 524 torr? (a) 3.69 L (b) 11.6 L (c) 20.2 L (d) 63.5 L (e) not possible, since the volume would have to be negative 35. What is the density of carbon dioxide gas at 25.2 C and 98.0 kpa? (a) 1.74 g/l (b) g/l (c) g/l (d) g/l (e) 2.09 g/l 36. A flask with a volume of 3.16 L contains 9.33 grams of an unknown gas at 32.0 C and 1.00 atm. What is the molar mass of the gas? (a) 144 g/mol (b) 66.1 g/mol (c) 73.9 g/mol (d) 81.4 atm (e) 144 atm 9 of 12
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Name (printed): Signature:
CHEM Lab Section Number: Name (printed): Signature: This exam consists of 36 questions all of equal value for a total of 225 points. Make sure that your test has all of the pages. Please read each problem
Name (printed): Signature:
CHEM Lab Section Number: Name (printed): Signature: This exam consists of 36 questions all of equal value for a total of 225 points. Make sure that your test has all of the pages. Please read each problem
Name (printed): Signature:
CHEM Lab Section Number: Name (printed): Signature: This exam consists of 36 questions all of equal value for a total of 225 points. Make sure that your test has all of the pages. Please read each problem
Name (printed): Signature:
CHEM Lab Section Number: Name (printed): Signature: This exam consists of 36 questions all of equal value for a total of 225 points. Make sure that your test has all of the pages. Please read each problem
Name (printed): Signature:
CHEM Lab Section Number: Name (printed): Signature: This exam consists of 36 questions all of equal value for a total of 225 points. Make sure that your test has all of the pages. Please read each problem
Name (printed): Signature:
CHEM Lab Section Number: Name (printed): Signature: This exam consists of 36 questions all of equal value for a total of 225 points. Make sure that your test has all of the pages. Please read each problem
Name (printed): Signature:
CHEM Lab Section Number: Name (printed): Signature: This exam consists of 36 questions all of equal value for a total of 225 points. Make sure that your test has all of the pages. Please read each problem
Name (printed): Signature:
CHEM Lab Section Number: Name (printed): Signature: This exam consists of 36 questions all of equal value for a total of 225 points. Make sure that your test has all of the pages. Please read each problem
CHEM 200/202 Exam 3-A November 15, Name (printed): Signature:
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