© 2004 M.L. Peck CHEM 101 Fall 2004 Practice Final Exam DR. PECK Directions: Choose the best answer for each multiple choice question (numbers 1 - 40). 1. Identify the net ionic equation for the reaction of HCl and Ba(OH)2. 2HCl(aq) + Ba(OH)2(aq) → BaCl2(aq) + 2H2O(l) (a) HCl(aq) + OH-(aq) → Cl-(aq) + H2O(l) (b) 2HCl(aq) + Ba(OH)2(aq) → 2Cl-(aq) + Ba2+(aq) + 2H2O(l) (c) H+(aq) + OH-(aq) → H2O(l) (d) 2H+(aq) + 2OH-(aq) → 2H2O(l) (e) 2HCl(aq) + Ba2+(aq) → BaCl2(aq) + 2H+(aq) 2. The molarity of a solution is defined as I. the number of moles of solute per kilogram of solvent. II. the number of moles of solute per liter of solution. III. the number of equivalent weights of solute per liter of solution. IV. the number of moles of solute per kilogram of solution. V. the number of moles of solute per liter of solvent. (a) I (b) I and II (c) II and III (d) II (e) I, II, and III 3. In the following reaction, the oxidizing agent is ____, when it is __________ in the following reaction. 6KOH(aq) + 3Cl2(aq) → KClO3(aq) + 5KCl(aq) + 3H2O(l) (a) Cl2, reduced to KCl (b) Cl2, oxidized to KClO3 (c) Cl2, oxidized to KCl (d) Cl2, reduced to KClO3 (e) KOH, reduced to H2O 4. Suppose you have a 100-gram sample of each of the following compounds. Which sample contains the smallest number of moles of hydrogen atoms? (a) NH3 (b) H2O (c) H3PO4 (d) CH4 (e) HClO 5. These three species 80Se, 81Br and 82Kr have (a) the same atomic mass. (b) the same number of protons. (c) the same number of neutrons. (d) the same mass number. (e) the same number of electrons. 6. The total number of electrons in p orbitals in a palladium atom (atomic number = 46) in its ground state is: __________. (a) 6 (b) 12 (c) 18 (d) 24 (e) 30 Prac 1© 2004 M.L. Peck 7. Which of the following atoms or ions is not diamagnetic? (a) S2- (b) Zn (c) Mg (d) Mg2+ (e) B 8. What is the electronic geometry for 5 regions of high electron density on a central atom? (a) octahedral (b) square planar (c) tetrahedral (d) trigonal bipyramidal (e) trigonal planar 9. Which of the following changes in water represents a chemical change? (a) Melting of ice. (b) Boiling water. (c) Sublimation of solid ice directly to gaseous water. (d) Calcium reacting with water to produce calcium hydroxide. (e) Heating water from 25ºC to 60ºC. 10. Which response includes all the compounds listed below and only the compounds? I. ethyl alcohol II. air III. mercury IV. steam V. calcium fluoride (a) I, II, and IV (b) III and V (c) II, IV, and V (d) I, III, and IV (e) another one or another combination 11. If 25 grams of methane, CH4, and 30 g of ammonia, NH3, are combined with excess oxygen, how much methane or ammonia will be left when the reaction is finished? 2CH4 + 2NH3 + 3O2 → 2HCN + 6H2O (a) 0.10g NH3 (b) 0.20 mol CH4 (c) 0.10 g CH4 (d) 10 g NH3 (e) 0.20 mol NH3 12. What is the percent by mass of sulfur in Al2(SO4)3? (a) 9.38% (b) 18.8% (c) 24.6% (d) 28.1% (e) 35.4% Prac 2© 2004 M.L. Peck 13. Which of the following statements about AsF5 is false? a. The electronic geometry is trigonal bipyramidal. b. As is sp3d hybridized. c. As has one lone pair. d. Bonding angles are 90º, 120º or 180º. e. The molecular geometry is trigonal bipyramidal. 14. What volume of 40.0% NaNO3 solution contains 0.15 mole of NaNO3? Density = 1.32 g/mL. (a) 42.0 mL (b) 3.86 mL (c) 9.60 mL (d) 24.1 mL (e) 38.2 mL 15. Calculate the molarity of the resulting solution if enough water is added to 50.0 mL of 4.20 M NaCl solution to make a solution with a volume of 2.80 L. (a) 75.0 M (b) 0.043 M (c) 33.1 M (d) 0.067 M (e) 0.0750 M 16. What volume of 0.130 M HCl solution will just react with 0.424 gram of Ba(OH)2? 2HCl + Ba(OH)2 → BaCl2 + 2H2O (a) 38.1 mL (b) 32.6 mL (c) 24.1 mL (d) 18.6 mL (e) 96.7 mL 17. Arrange the following elements in order of increasing first ionization energy. Mg, Al, Si, P, S (a) Al < Mg < Si < S < P (b) Mg < Al < Si < P < S (c) Al < Mg < Si < P < S (d) Mg < Al < Si < S < P (e) Al < Mg < P < Si < S 18. Which of the following elements has the most negative electron affinity? (a) Si (b) P (c) S (d) Se (e) Te 19. Which of the following anions represents a peroxide? (a) O- (b) O2- (c) O2- (d) O22- (e) O3- Prac 3© 2004 M.L. Peck 20. Which of the following oxides does not give an acidic solution when dissolved in water? (a) SO2 (b) CO2 (c) N2O5 (d) P4O10 (e)Na2O 21. Arrange the following in order of increasing acidic character (most acidic at the right). Al2O3, Na2O, N2O5 (a) Al2O3 < Na2O < N2O5 (b) N2O5 < Al2O3 < Na2O (c) Al2O3 < N2O5 < Na2O (d) Na2O < Al2O3 < N2O5 (e) Na2O < N2O5 < Al2O3 22. The number of unshared pairs of electrons in the outer shell of oxygen in Cl2O is __________. (a) one (b) two (c) three (d) four (e) zero 23. The Lewis dot formula for CO2 shows (a) two single covalent bonds. (b) one single covalent bond and one double covalent bond. (c) one single covalent bond and one triple covalent bond. (d) a total of 8 x 3 = 24 electrons (dots). (e) two double covalent bonds. 24. How many resonance structures does the nitrate ion, NO3-, have? (a) one (b) two (c) three (d) four (e) zero 25. Which of the following molecules has the most ionic bond character? (a) NCl3 (b) F2
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