201F10DexF - Chem 201 FINAL EXAM December 11, 2010 Prof....

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Unformatted text preview: Chem 201 FINAL EXAM December 11, 2010 Prof. Noble Prof. Hoyt Prof. Powe Prof. Noble Prof. Franco 201-01 201-02 201-03 201-04 201-75 A W 9:00 A W 12:00 B T 9:00 A M 8:00 A T 7:00 B W 10:00 B R 8:00 C W 1:00 B M 9:00 B R 7:00 C W 12:00 C F 10:00 E W 10:00 C M 12:00 C R 4230 D W 4:00 D W 2:00. F R 1:00 E R 1200 E R 9:00 G T 1:00 F F 9:00 H W 12:00 G F 1:00 I F 12:00 PLEASE KEEP YOUR WORK COVERED. This exam will be graded by the SCANTRON Form provided. Be certain that you fill it in correctly. On the front side, enter your name (print and sign), your instructor's name, and your section letter in the spaces as shown below. NAME print your name and sign your name SUBJECT give your instructor's name TEST NO. give section letter DATE PERIOD On the back side of the Form in the colored portion where it says "NAME", print your last name. BE CERTAIN TO ENTER THE CORRECT INFORMATION. This exam has 33 questions. Part 1 has 18 questions worth five points each and covers newer material; this Part must be answered on the FRONT side of the SCANTRON Form in spaces 1-18. Part 2 has 15 questions worth four points each and covers older material; this Part must be answered on the BACK side of the SCANTRON Form in spaces 26-40. Because of this arrangement, THERE ARE NO QUESTIONS NUMBERED 19-25. Skip 19-25 on the SCANTRON Form. Be certain no stray marks are on the Form. Be certain you fill in all spaces properly. Be certain you cleanly erase any changes. You must use a pencil. For every question there is only o_n_e correct answer. Be certain you have all questions 1-18 and 26-40. None of the exam pages will be collected. You may tear pages off. You may use backsides for scratch work and cover pages. TURN IN ONLY THE SCANTRON CARD. Give the card to your (or another) TA in the room. Have your picture ID ready. The key for the exam will be posted shortly afterwards on Prof. Noble's web site at http:/ /louisville.edu /faculty/menobl01 /N0bleChem201 /201misc.html. Paper copy of the key will also be posted outside CB 348. If you record your answers, you will be able to grade your exam. If you wish, you may pick up your Scantron card next week. Check with your instructor for availability. Chem 201 FINAL EXAM December 11, 2010 INFORMATION PAGE This page contains information which may or may not be needed. SOLUBILITY TRENDS For purposes of this course, we will use the following trends to predict whether a compound is soluble or insoluble. These guidelines are given in a priority sequence: use them in this order. Group 1(1A) compounds, ammonium compounds, and acids are soluble. . All nitrates, acetates, chlorates, and perchlorates are soluble. Silver, lead, mercury(l) and copper(I) compounds are INSOLUBLE. Chlorides, bromides and iodides are soluble. Sulfates are soluble except calcium sulfate and barium sulfate. Compounds with anions of 2— or 3— charge are INSOLUBLE. Hydroxides are INSOLUBLE except calcium hydroxide and barium hydroxide. .‘lS‘DP‘rBPJN’t‘ Avogadro's number 6.022 X 1023 Temperatureconversion T(K) = T(°C) + 273 Gases PV = nRT atm-L mol-K R = 0.08206 atm = 760 mmHg = 760 Torr Standard Molar Enthalpies of Formation (in kJ/mol) Ag+(aq) 105.9 AgC1(s) 427.03 Cl—(aq) —167.46 K+(aq) —251.2 No3‘(aq) —206.57 Molecular Orbital Theory n = 2 valence: (023)(0:3)(W2p)(02p)(7?§p)(0§p) Part 1. New Material 1. Which of the following is the correct order of decreasing lattice energy for the given compounds? (A) KCl > KBr > KI (B) KI > KBr > KCI (C) KCl > KI > KBr (D) KI > KCl > KBr (E) KBr > KCl > K1 2. Which of the following statements is FALSE? (A) The bonding in CsCl is ionic. (B) The bonding in BrF is polar covalent. (C) The bonding in N2 is nonpolar covalent. (D) An S—O bond is stronger than a 8:0 bond. (E) A P—F bond is more polar than a 8—01 bond. 3. Which of the following elements is the most electronegative? (A) P (B) As (C) Ge 4. Which is the correct Lewis structure for NF3? (A) (B) —2: (C) :-n—z O. (D) A1 (D) .0: N = O. O. I. :F: (E) Cs (E) ll 2 H 5. Consider the species N2: N2 and NJ. Which of these is paramagnetic? (A) N2 and N; (B) N; and N2 (C) N; and N; (D) only N; (E) None are paramagnetic. 6. Elemental oxygen naturally occurs in two allotropic forms, the familiar 02 and the toxic, highly reactive O3, ozone. Taking into account the resonance structures that can be drawn for the 03 molecule, what is the best value for the CO bond order in this molecule? (A) —1 (B) 0 (C) 1 (D) 1.5 (E) 2 7. Which of the following has a zero formal charge on the central atom? (A) 03 (B) N02“ (C) No; (D) A1F63“ (E) NNO 8. What is the molecular geometry (shape) of the SF4 molecule? (A) trigonal bipyramid (B) trigonal pyramid (C) square planar (D) tetrahedral (E) see-saw 9. What is the shape of Se032_? (A) bent (B) trigonal pyramidal (C) trigonal planar (D) tetrahedral (E) T-shaped 10. What is the ideal O—N—O bond angle in the ion N027 (A) 60° (B) 90° (C) 109.5° (D) 120° (E) 180° 11. Which of the following is polar? (A) cs2 (B) AsCl3 (C) 803 (D) BF3 (E) NH4+ 12. Which of the following statements is TRUE? (A) A double bond cannot exist between a carbon atom and an oxygen atom. (B) Single bonds are shorter than double bonds. (C) Single bonds are stronger than double bonds. (D) Only valence electrons are shown in a Lewis structure. (E) A triple bond is composed of three 712 bonds. 13. Consider the compound CH3NHZBF3 whose Lewis . u . structure is at right. For this compound, which of the H H ' F ' following statements is FALSE? I I I " H-C—N—B—F: (A) The formal charge on boron is —1. I I I H H 3 F 3 (B) The nitrogen is tetrahedral. " (C) The ideal bond angles on carbon are 109.5°. (D) The boron is 3p3 hybridized. (E) The fluorines are 3p3 hybridized. 14. The Lewis structure for acetic acid is at right. How H many 0 and TE bonds are in this compound? I .. H - C - C - O - H o 71: I H u (A) 8 0 H :0: (B) 7 1 (C) 6 2 (D) 5 3 (E) 4 4 15. According to the valence-bond model, which of the following molecules has 8193 hybridization on the carbon atom? (In B-E, carbon is the central atom.) (A) co (B) co2 (C) (3014 (D) ClZCO (E) H200 i 16. Which one of the following statements is FALSE? (A) The nitrogen atom in NH3 is 3p2 hybridized. (B) The carbon atom in CSZ is sp hybridized. (C) The carbon atom in CH4 is sp3 hybridized. (D) sp2 hybrid orbitals are planar and at 120° to each other. (E) 3p hybrid orbitals lie at 180° to each other. 17. According to Molecular Orbital Theory, which of the following statements is TRUE? (A) Li2 cannot exist. (B) B2 has a bond order of one. (C) 022~ has a bond order of two. (D) 02 is diamagnetic. (E) 022— has a bond order of two. 18. For C2, which of the following statements is FALSE? (A) The bond order is two. (B) All electrons are spin paired. (C) There are four electrons in nzp. (D) There are two electrons in 092‘s. (E) C2 cannot exist. 19-25: Leave these spaces blank on the Seantron card. Go to number 26 on the backside. Part 2. Old Material 26. Magnesium is in which of the following categories? (A) alkali metals (B) alkaline earth metals (C) transition metals (D) halogens (E) noble gases 27. How many protons, neutrons and electrons are there in one atom of 39Cl (chlorine-39)? protons neutrons electrons (A) 17 22 17 (B) 17 17 22 (C) 22 17 17 (D) 17 39 17 (E) 39 38 39 28. What is the correct systematic name for the compound FeSO4? (A) iron sulfur tetroxide (B) iron(II) sulfate (C) iron(IV) sulfate (D) iron(IV) sulfur tetroxide (E) iron sulfur(IV) oxide 29. A compound of carbon and chlorine is 14.5% carbon, by mass. Which of the following is a possible molecular formula for this compound? (A) 0014 (B) (32012 (C) 02014 (D) 02016 (E) 03018 30. Balance the following equation. P4010(s) + HNO3(l) —v N205(g) + HPO3(l) For the correctly balanced equation, What are the coefficients for P4010 and N205? P40 10 N205 (A) 2 1 (B) 1 1 (C) 1 2 (D) 1 3 (E) 1 4 31. 32. 33. 34. 35. Which of the following compounds is soluble in water? (A) CuCl2 (B) Hg212 (C) AgBr (D) BaSO4 (E) PbCrO4 Magnesium reacts with iron(III) chloride to form magnesium chloride and iron. 3 Mg + 2 FeCl3 —v 3 MgC12 + 2 Fe A mixture of 41.0 g of magnesium and 175 g of iron(III) chloride is allowed to react. What is the excess reactant and how much of it remains in the vessel when the reaction is complete? (A) FeCl3: 67 g remain (D) Mg: 1.7 g remain (B) FeCl3: 104 g remain (C) FeCl3: 134 g remain (E) Mg: 8.7 g remain What element is reduced in the following chemical reaction? Cu + 4H+ + SO42" -. Cu2+ + so2 + 2H20 (A) Cu (B) H (C) S (D) O (E) H20 A 5.00-liter cylinder is filled with butane gas at 27 °C until the pressure in the tank is 1.00 atm. What is the pressure (in atm) in the tank on a warm day when the temperature is 39 °C? (A) 0.692 (B) 0.962 (C) 1.04 (D) 1.44 (E) 1050 Consider the following reaction. 802(g) + 2 C12(g) —. SOClZ(l) + C120(g) Assume the chlorine and the sulfur dioxide start at the same temperature and pressure. How many liters of chlorine gas would be required to react completely with 21.7 L of sulfur dioxide? (A) 0.500 (B) 2.00 (C) 10.9 (D) 21.7 (E) 43.4 36. 37. 38. 89. What is AH° (in kJ) for the precipitation reaction which occurs when aqueous solutions of potassium chloride and silver nitrate are mixed? (A) 80.3 (B) 17.9 (C) 7.2 (D) —15.6 (E) —-65.5 Consider the following equations. 2 N20(g) + 3 02(g) —> 4 N02(g) AH° = —31.3 kJ 2 NO(g) + 02(g) -+ 2 N02(g) AH° = —114.2 kJ Based on the above, what is AH° (in kJ) for the following reaction? 4 NO(g) —’ 2 N2O(g) + 02(g) AH° = ? (A) —96.4 (B) —-132.7 (C) —160.1 (D) «197.1 (E) —228.3 Which of the following statements is FALSE? (A) There are three subshells in the n = 3 shell. (B) There are seven orbitals in every d subshell. (C) The 53 orbital is larger than the 4s orbital. . (D) Electrons with the same spin cannot be in the same orbital. (E) The n = 4 shell can hold a maximum of 32 electrons. Which of the following statements is FALSE? (A) Electrons in ls will shield all other electrons in an atom from the full nuclear charge. (B) Mo3+ has three electrons in the 4d subshell. (C) Nickel is a d-block metal. (D) Mn3+ has a stronger hold on its electrons than Mn2+. (E) Tin has five valence electrons in n = 4. 40. Which of the following has the configuration 1322322p63323p63d7? (A) Cr3+ (B) Mn (C) Fe3+ (D) CO Ni3+ ...
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This note was uploaded on 01/12/2012 for the course CHEM 201 taught by Professor Hoyt during the Fall '07 term at University of Louisville.

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201F10DexF - Chem 201 FINAL EXAM December 11, 2010 Prof....

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