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NAME _______________________________________________ CHEMISTRY 101 EXAM 3 FORM A SPRING 2002 SECTIONS 501-509 DR. KEENEY-KENNICUTT Directions: (1) Put your name, S.I.D. number and signature on the free response part of the exam where indicated. (2) Each multiple choice question is actually 2 questions on your scanning sheet. If you are sure of an answer, put the same answer down for both questions for 5 pts. If you cannot decide between two answers, put one answer down for one question and the other answer down for the other question. If you get one correct you'll get half credit for 2.5 pts. If there is an ambiguous multiple choice question, use the last page to explain your answer. (3) Do NOT write on the envelope. (4) Bubble in OPTION A on the scanning sheet IF you want your grade posted. (5) When finished, put the free response answers in the envelope with the scanning sheet. You can keep the multiple choice part - the answers will be given to you as you leave. (6) There are a total of 28 questions (16 actual questions). PART 1 1&2. Which statement is correct? (a) The atomic number of zinc is 65. (b) The most stable ion of sulfur is S3−. (c) A magnesium atom is larger than a sodium atom. (d) The sodium cation is larger than the sodium atom. (e) Fluorine has a more negative electron affinity than lithium. 3&4.In the reaction: HCO3− + H3O+ → H2CO3 + H2O the two Bronsted acids are .... (a) HCO3− and H2CO3 (b) HCO3− and H2O (c) H3O+ and HCO3− (d) H3O+ and H2CO3 (e) H3O+ and H2O 5&6. Arrhenius defined a base as: (a) an electron pair donor (b) a hydroxide ion source in water (c) an electron pair acceptor (d) a hydrogen ion source in water (e) a proton acceptor Keeney-Kennicutt, 2002 A1 7&8 Consider the ion, 28Al3+. The number of fundamental particles in the ion is (a) 28 protons, 31 electrons and 28 neutrons (b) 13 protons, 13 electrons and 15 neutrons (c) 13 protons, 16 electrons and 15 neutrons (d) 15 protons, 12 electrons and 28 neutrons (e) 13 protons, 10 electrons and 15 neutrons 9&10. Which of the following bonds is classified as nonpolar covalent? (a) C-Cl (b) Na-Cl (c) C-P (d) Sr-Cl (e) C-I 11&12. Which of the following processes is associated with the ionization energy of an atom? (a) Cl(g) → Cl+(g) + e− (c) Cl2(g) → 2Cl(g) (b) Cl−(g) → Cl(g) + e− (d) Cl+(g) + e− → Cl(g) (e) Cl(g) + e− → Cl−(g) 13&14. In 1 mole of H3PO4, there are ______ equivalents of the acid. (a) 3 Keeney-Kennicutt, 2002 (b) 2 (c) 1 (d) 1/2 (e) 1/3 A2 15&16. Which of the following molecular shapes has 5 atoms and 1 lone pair of electrons located around the central atom? (a) see-saw (b) square planar (c) trigonal bipyramidal (d) square pyramidal (e) T-shaped 17&18. According to Valence Bond Theory and Valence Shell Electron Pair Repulsion Theory, if the hybridization at an atom is sp2, the electronic geometry of the molecule at that atom is (a) linear (b) trigonal planar (d) trigonal bipyramidal (e) octahedral (c) tetrahedral 19&20. Which of these three molecular species, if any, are polar? NH3 XeF4 H2S (a) NH3 only (b) H2S and NH3 only (d) all are polar (e) none are polar (c) H2S only OVER ⇒ Keeney-Kennicutt, 2002 A3 21&22. If 50.0 mL of 2.00 M HNO3 solution is added to 15.0 mL of 4.00 M Ba(OH)2, the resulting solution will be _________ M in Ba(NO3)2. (a) 0.065 M (b) 0.31 M (c) 0.77 M (d) 0.42 M (e) 0.55 M 23&24. What volume of 0.300 N H3PO4 is required to completely neutralize 0.400 g of Mg(OH)2? (a) 24.0 mL Keeney-Kennicutt, 2002 (b) 12.0 mL (c) 58.7 mL (d) 45.7 mL (e) 35.7 mL A4 CHEMISTRY 101 SPRING 2002 NAME EXAM 3 S 501-509 ID Signature Form A PART 2 (24 pts) 25. For each of species, draw the Lewis dot structure (2 pts and don't forget all the electrons). For the central atom, give the number of regions of high electron density (2 pts), the hybridization (2 pts), electronic geometry (2 pts), the molecular (or ionic) geometry (2 pts), and say if the species has a dipole moment (is polar) or not (2 pt). + (a) SF3 (b) BrF3 + SF3 BrF3 - Regions of High e Density Hybridization Electronic Geometry Molecular Geometry Has dipole moment (yes/no) (4 pts) Draw a 3-dimensional representation of these 2 species using wedges and dotted lines. Show all lone pairs of electrons. + (a) SF3 (b) BrF3 OVER ⇒ Keeney-Kennicutt, 2002 A5 26. Circle which acid is stronger (1 pts) and explain why? Use the concept of bond strength.(3 pts) (4 pts) HBrO3 and HClO3 27. Draw appropriate Lewis dot structures for all the resonance structures of the nitrite ion. (4 pts) 28. Consider the organic compound to the right. This is Claritin, an antihistamine. (2 pts) (a) How many sigma bonds are present? ___________ (2 pts) (b) How many pi bonds are present? _______________ (EXTRA CREDIT 2 pts) (c) How many lone pairs of electrons are present in the entire molecule? _____ Keeney-Kennicutt, 2002 A6 SCRAP PAPER OR COMMENTS ON EXAM CHEMISTRY 101 Spring 2002 EXAM 3 Form A S 501-509 Keeney-Kennicutt, 2002 NAME A7