CHM 101 Sample Exam Answers (Last Page) Part 1

CHM 101 Sample Exam Questions 1. You are responsible for the information on this page. Please read it carefully. 2. Print and code both your name and 10-digit affiliate ID on the scantron sheet. The affiliate ID is the second sequence of numbers on your University ID card. 3. Use only a #2 pencil. 4. Do all calculations on the exam pages. Do not make any unnecessary marks on the answer sheet. 5. This exam consists of 25 multiple choice questions worth 4 points each and a periodic table. Make sure you have them all. 6. Choose the best answer to each of the questions and answer it on the computer-graded answer sheet. Read all responses before making a selection. 7. When you are finished, turn in your scantron in the stack that corresponds to your version. Your scantron is color-coded in the upper right hand corner. You may keep your exam questions. Potentially useful information: Activity Series 1 inch = 2.54 cm 1 lb = 453.6 g 1 quart = 0.9464 L 4 quart = 1 gallon 32 fluid ounces = 1 quart K = ºC + 273.15 Heat energy added = Specific heat × Mass in grams × Change in temperature in Cº 1 cal = 4.184 J 1000 cal = 1 kcal = 1 Cal Solubility Info All compounds containing any of the following are soluble: Na+, K+, NH4+, NO3 v= c PV PV 1 1 = 2 2 n1T1 n2T2 Li (Most Active) K Ba Ca Na Mg Al Zn Fe Cd Ni Sn Pb H Cu Hg Ag Au (Least Active) 1atm = 760 torr =760 mmHg λ c = 3.0x108 m/s PV = nRT (R = 0.08206 L ⋅ atm/K ⋅ mol) 1 Chapter 1 1. Which of the following is considered a mixture? A. Cl2 B. CO2 C. Na D. Copper-zinc alloy E. Both A and B are mixtures 2. Which of the following best describes what happens when water evaporates? A. B. C. D. E. Water molecules undergo a chemical change in which hydrogen and oxygen molecules form. Water molecules undergo a physical change in which hydrogen and oxygen molecules form. Water molecules undergo a chemical change in which gaseous water vapor molecules form. Water molecules undergo a physical change in which gaseous water vapor molecules form. Water boiling does not involve physical or chemical changes. 3. A pharmaceutical chemist measured the melting point of an unknown compound in four trials. Her data is listed below. Which of the following statements best describes her data? Melting Point (°C) 95.29 95.30 95.31 92.99 A. B. C. D. E. Three melting points are accurate and one is not accurate. Three melting points are precise. The data is accurate. All of the data is not accurate. The average should have only one significant figure. 4. Which of the following represents a pure compound? Problem 1.029 5. If the mass of a dog is 65-lb, what is the mass in units of kilograms? (1 lb = 453 g) A. 29,000 kg B. 29 kg C. 0.290 kg D. 0.14 kg E. 140 kg 2 6. If the diameter of a cell is 9.0 x10−6 meter, its diameter can also be reported as _______. A. B. C. D. E. 9.0 mm 9.0 μm 9.0 nm 9.0 pm 9.0 km 7. What is the density of a cubic solid that is 3.00 cm on each side and has a mass of 25.0 grams? A. 0.926 g/cm3 B. 1.08 g/cm3 C. 2.78 g/cm3 D. 8.33 g/cm3 E. 27.0 g/cm3 8. Why is the density of gaseous CO2 less than that of solid CO2? A. In the gaseous state, the CO2 molecules have a lower mass. B. In the gaseous state, the CO2 molecules have a greater mass. C. In the gaseous state, there is more space between the CO2 molecules. D. In the gaseous state, there is less space between the CO2 molecules. E. In the gaseous state, the CO2 molecules are bigger. 9. When 222 seconds is converted to minutes, how should the result be properly reported with the correct number of significant figures? A. 4 min B. 3.7 min C. 3.70 min D. 3.700 min E. 3.70x10-2 min 10. The density of gold is 19.3 g/mL. What is the mass of 0.0100 L of gold, in units of grams? A. B. C. D. E. 1.93x10-6 g 0.193 g 1.93 g 193 g 1.93x104 g 11. Which of the following is the lowest possible temperature? A. B. C. D. E. –273.15 °C –273.15 K 273.15 K 0 °C The is no lowest possible temperature 3 12. What happens to the potential energy and kinetic energy of a ball as it rolls down a hill? A. B. C. D. E. Potential energy increases and kinetic energy increases. Potential energy increases and kinetic energy decreases. Potential energy decreases and kinetic energy increases. Potential energy decreases and kinetic energy decreases. There is no change at all. Chapter 2 13. Based in part on his experiments using a cathode ray tube, Thomson developed the “plum pudding” model for the atom. When Rutherford bombarded a thin metal sheet with alpha particles, most passed through but some were deflected or bounced back. Rutherford’s model of the atom included what atomic structure to explain the deflection of alpha particles? A. B. C. D. E. electron neutron nucleus cathode Ray plums 14. Which of the following best describes an electron? A. B. C. D. E. same charge as the neutron a positively charged particle greater in mass than a proton located in the nucleus of an atom negatively charged particle 15. An atom with 25 protons and 30 neutrons has which of the following symbols? A. 25 5 B B. 30 25 Mn C. 55 25 Mn D. 25 30 Zn E. 55 30 Zn 16. Calculate the relative atomic mass of Kelsium, a fictional element, if it has two isotopes with the following abundance and masses: 10 Ke 10.01 amu 20.00% 12 Ke 12.02 amu 80.00% A. 5.81 amu B. 5.21 amu C. 10.41 amu D. 11.00 amu E. 11.62 amu 17. Naturally occurring magnesium is comprised of three isotopes: 24Mg, 25Mg, and 26Mg. Which of the following statements can be said about their relative abundance? (Refer to the periodic table) A. 24Mg is present is the largest percent abundance. B. 25Mg is present is the largest percent abundance. C. 26Mg is present is the largest percent abundance. D. Each has a 33.334% abundance E. Each has a 50.000% abundance 4 18. How many protons and electrons are in a S2− anion? A. B. C. D. E. 14 protons, 16 electrons 16 protons, 18 electrons 16 protons, 14 electrons 18 protons, 16 electrons 32 protons, 30 electrons 19. Which of the following symbols represents an oxide ion? A. O– B. O2– C. O3– D. O+ E. O2+ 20. About how much more massive is an average argon atom than an average helium atom? A. 2 times B. 9 times C. 10 times D. 40 times E. They have the same mass 21. The element calcium can be classified as a(n) _______ . A. B. C. D. E. alkali metal transition metal main-group element actinide nonmetal 22. Which of these elements is a noble gas? A. lanthium B. oxygen C. hydrogen D. neon E. chlorine 23. Which of the following elements occurs naturally as diatomic molecules? A. hydrogen B. nitrogen C. fluorine D. iodine E. All of the above Chapter 3 24. Which of the following is an ionic compound? A. B. C. D. E. CaF2 N2 CF4 H2O all of these 25. What is the formula for a compound composed of Cr3+ ions and S2- ions? A. CrS B. Cr2S3 C. Cr3S2 D. CrS2 E. CrS3 5 26. What is the formula for the compound chromium(III) oxide? A. Cr3O B. Cr2O3 C. CrO3 D. CrO E. Cr3O2 27. Which of the following is the correct name for the compound with the formula, Na2SO4? A. B. C. D. E. sodium sulfate disodium sulfate sodium sulfide sodium sulfite disodium sulfur tetroxide 28. Which of the following acids is named incorrectly? A. B. C. D. E. HNO3, nitric acid HCl, hydrochloric acid H2CO3, carbonic acid H3PO4, hydrophosphoric acid CH3CO2H, acetic acid 29. Which of the following substances is classified as a molecular compound? A. B. C. D. E. CaCO3 AgCl NH3 NO3 none of the above 30. Solutions containing what type(s) of compounds do NOT conduct electricity? A. B. C. D. E. Acids Bases Molecular compounds Ionic compounds All of these Chapter 4 31. What is the molar mass of C6H12O6? A. B. C. D. E. 29.02 g/mol 30.03 g/mol 174.12 g/mol 180.16 g/mol More information is needed 6 32. What is the mass of 1.50 mole of ammonia? A. B. C. D. E. 11.35 g 0.0881 g 25.5 g 17.03 g 1.50 g 33. When 1.00 mole of Na2SO4 is dissolved in water, how many Na+ ions are in the water? A. B. C. D. E. ½ Na+ ion 1 Na+ ion 6.02 × 1023 Na+ ions 1.20 × 1024 Na+ ions 3.32 × 10−24 Na+ ions 34. Which of the following contains the greatest number of moles of molecules? A. B. C. D. E. 1.0 gram of H2 1.0 gram of O2 1.0 gram of Cl2 1.0 gram of CO2 All contain the same number of moles 35. Which of the following equations best describes the process of dissolving calcium nitrate in water? A. B. C. D. E. Ca(NO3)2(s) Ca(NO3)2(s) Ca(NO3)2(s) Ca(NO3)2(s) Ca(NO3)2(s) → Ca(l) + 2NO3(l) → Ca(aq) + 2N(aq) + 3O(aq) → Ca2+(aq) + 2N3-(aq) + 3O32-(aq) → Ca2+(aq) + (NO3-)2(aq) → Ca2+(aq) + 2NO3-(aq) 36. Diamond is a form of pure carbon. How many moles of carbon are in a 2.0-gram diamond? A. B. C. D. E. 24 mol 12 mol 0.50 mol 0.083 mol 0.17 mol 37. What is the mass percentage of iron in Fe2O3? A. B. C. D. E. 69.94% 66.67% 34.97% 77.73% 40.00% 7 38. Which of the following is NOT an empirical formula? A. C3H9O3 B. C5H9N3 C. C5H12 D. CH4 E. CH 39. Analysis of a compound showed that it contained 21.9% sulfur and 78.1% fluorine by mass. What is the empirical formula for the compound? A. B. C. D. E. SF4 S2F7 SF6 S2F3 SF2 40. How many moles of HCl are in 35.0 mL of a 0.100 M HCl solution? A. B. C. D. E. 3.50 mol 0.350 mol 2.86 mol 2.86×10–3 mol 3.50×10–3 mol 41. What is the percent by mass concentration of KCl in a solution prepared by adding 25.0 g KCl to 125.0 g of water? A. 0.200% B. 20.0% C. 0.167% D. 16.7% E. 5.00% 42. A solution is prepared by adding enough water to 1.0 mL of a 2.0 M solution so that the total volume is 10.0 mL. What is the concentration of the diluted solution? A. B. C. D. E. 2.0 M 1.0 M 0.20 M 10 M 0.22 M Chapter 5 43. When aqueous solutions of H2SO4 and NaOH are mixed, _______ will occur. A. B. C. D. E. a combination reaction a decomposition reaction a single-displacement reaction a double-displacement reaction no reaction 8 44. Identify the spectator ions in the following reaction: Zn(s) + 2HNO3(aq) → Zn(NO3)2(aq) + H2(g) A. B. C. D. E. Zn2+ and NO3– H+ and NO3– NO3– only Zn2+ only There are no spectator ions 45. When the equation below is balanced properly, what is the coefficient in front of O2(g)? C6H14(l) + A. 6 B. 7 O2(g) → C. 9 CO2(g) + H2O(g) D. 12 E. 19 46. When aqueous solutions of hydrochloric acid and sodium carbonate are mixed, A. B. C. D. E. H2 gas is formed. CO2 gas is produced. sodium metal is formed. a precipitate is formed. no reaction occurs. 47. Which of the metals (Al, Ca, Mg) will react in an aqueous solution of KNO3 to produce potassium metal? A. Mg B. Ca C. Al D. All of these E. None of these 48. When aqueous solutions of AgNO3 and MgCl2 are mixed, what is the correct formula for the precipitate that forms? A. B. C. D. E. K2Ag AgCl AgCl2 MgNO3 Mg(NO3)2 49. Which of the following equations best describes the reaction that occurs when potassium metal reacts with oxygen gas in a combination reaction? A. K(s) + O(g) → KO(s) B. K(s) + O2(g) → KO2(s) C. 4K(s) + O2(g) → 2K2O(s) D. 2K(s) + O(g) → K2O(s) E. K(s) + O2(g) → KO(s) + O(g) 9 50. Which of the following classifications describes the molecular-level representation? A. B. C. D. E. decomposition combination single-displacement double-displacement combustion Chapter 6 51. In any chemical reaction, which of the following is NOT always conserved? A. B. C. D. Number of atoms. Mass Moles of atoms Number of molecules 52. The balanced equation for the decomposition of TNT is given. If 4.6 mole of TNT reacts, what is the theoretical yield of N2 in moles? 2C7H5(NO2)3(s) → 7C(s) + 7CO(g) + 3N2(g) + 5H2O(g) A. B. C. D. E. 0.57 mol 6.9 mol 14 mol 3.1 mol 0.85 mol 53. The balanced equation for the combustion of acetylene, C2H2, is given. If 12 molecules of C2H2 reacts, how many molecules of O2 should react with it? A. 5 B. 10 C. 60 D. 30 E. 12 2C2H2(g) + 5O2(g) → 4CO2(aq) + 2H2O(l) 54. What mass of Cl2 will react with 5.00 grams of Al by the reaction represented by the following balanced equation? 2Al(s) + 3Cl2(g) → 2AlCl3(g) A. B. C. D. E. 1.27 grams Cl2 7.5 grams Cl2 13.1 grams Cl2 19.7 grams Cl2 8.76 grams Cl2 10 55. When 2.4 mol C2H2 is mixed with 5.0 mol O2, the following reaction occurs: 2C2H2(g) + 5O2(g) → 4CO2(aq) + 2H2O(l) Which of the following best describes this particular reaction? A. B. C. D. E. C2H2 is the limiting reactant and should be used up completely. O2 is the limiting reactant and should be used up completely. C2H2 is the limiting reactant and some should be leftover after the reaction is complete. O2 is the limiting reactant and some should be leftover after the reaction is complete. Both reactants will be used up completely. 56. When 0.40 mol Al is mixed with 0.80 mol Cl2, the following reaction occurs: 2Al(s) + 3Cl2(g) → 2AlCl3(s) Which of the following best describes what remains after the reaction is complete? A. B. C. D. E. 0.40 mol Cl2 and 0.40 mol AlCl3 0.20 mol Cl2 and 0.40 mol AlCl3 0.13 mol Al and 0.53 mol AlCl3 0.20 mol Al and 0.20 mol AlCl3 0.60 mol Cl2 and 0.20 mol AlCl3 57. How many moles of NaCl should be produced when 0.50 mol Na is added to 0.50 mol Cl2? The balanced equation for the reaction is: 2Na(s) + Cl2(g) → 2NaCl(s) A. B. C. D. E. 0.50 mol NaCl 0.25 mol NaCl 0.75 mol NaCl 1.00 mol NaCl 1.50 mol NaCl 58. A 5.00-gram sample of mercury(II) oxide is decomposed completely to mercury metal and oxygen gas. What is the total mass of the products? A. B. C. D. E. 3.33 g 1.67 g 5.39 g 4.63 g 5.00 g 59. A student calculated that 20.0 g of product should be obtained in a reaction. However, after doing the reaction, the student obtained only a 65.0% yield. What mass of product did the student actually recover? A. 13.0 g B. 6.50 g C. 65.0 g D. 30.8 g 11 E. 35.0 g 60. The diagram below shows a mixture of O2 (larger and darker molecules) and H2 just at an instantaneous moment just before reaction. Assuming that the reaction goes to completion by the equation shown below, which of the following statements best describes the resulting mixture? 2H2(g) + O2(g) → 2H2O(g) A. B. C. D. E. H2 is the limiting reactant and one O2 molecule will be leftover. O2 is the limiting reactant and one H2 molecule will be leftover. H2 is the limiting reactant and five H2 molecules will be leftover. O2 is the limiting reactant and five O2 molecules will be leftover. There is no limiting reactant and no reactant molecules will be left over amounts. Chapter 7 61. The wavelength of light that has a frequency of 1.2×1013 s-–1 is _____________ m. A. B. C. D. E. 25 2.5×1021 0.0400 12.0 2.5×10–5 62. Which of the following is composed of the highest frequency light? A. B. C. D. E. Green light Violet light Orange light Yellow light Red light 63. Which of the following electron transitions in the H atom will result in the longest wavelength of light emitted? A. B. C. D. E. n = 6 to n = 2 n = 6 to n = 3 n = 6 to n = 4 n = 6 to n = 5 n = 5 to n = 6 12 64. Which of the following is NOT a type of electromagnetic radiation? A. B. C. D. E. X-Rays gamma rays visible light infrared radiation sound waves 65. Which of the following best describes a p orbital? A. B. C. D. E. spherical an orbit two lobes, 2-dimensional two lobes, 3-dimensional four lobes, 3-dimensional 66. Which type(s) of orbitals are allowed in the n = 2 principle energy level? A. B. C. D. E. s orbitals only s and p orbitals only p orbitals only s, p, and d orbitals only s, p, d and f orbitals only 67. How many orbitals are in the 4d sublevel? A. 2 B. 4 C. 5 D. 8 E. 10 68. How many unpaired electrons are in the ground state electron configuration of a nitrogen atom? A. 1 B. 2 C. 3 D. 5 E. 6 69. Which of the following is the abbreviated electron configuration for a titanium atom, Ti? A. B. C. D. E. [Ar] 3d2 [Ar] 4s2 3d2 [Ar] 4d2 [Ar] 4s2 4d2 [Ar] 4s2 3d4 70. Which of the following has the electron configuration, 1s2 2s2 2p6 3s2 3p6? A. B. C. D. E. S2 − Cl− Ar K+ All of the above 13 71. A lead atom has ____ valence electrons. A. 28 B. 2 C. 4 D. 14 E. 84 72. Which of the following atoms has the largest radius? A. Li B. C C. O D. F E. Ne 73. Which of the following atoms has the largest first ionization energy, I1? A. B. C. D. E. Li Be B C N 74. Why is the second ionization energy for potassium significantly greater than its first ionization energy? A. B. C. D. E. The second electron is a nonvalence (core) electron, therefore easier to remove. The second electron is a nonvalence (core) electron, and therefore harder to remove. The second proton is held more tightly, and therefore harder to remove. The second proton is held more tightly, and easier to remove. Formation of an anion requires more energy 75. Which of the following has the largest radius? A. B. C. D. E. S2 − Cl− Ar K+ All have the equal radii. Chapter 8 76. Which of the following substances has both ionic and covalent bonding? A. B. C. D. E. NaCl Cl2 MgO MgCO3 Ne 77. Which of the following elements is the most electronegative? A. H B. Li C. N D. O E. S 14 78. In which of the following molecules does oxygen have a partial positive charge (δ+)? A. B. C. D. E. O2 OF2 H2O MgO None of the above 79. Which of the following contains a triple bond? A. C2H6 B. HCN C. NO3 - D. NH3 E. O2 80. Which of the following is best represented by two equivalent resonance structures? B. NO2− A. CO2 C. NO3− D. N2 E. None of these 81. In which of the following does the central atom disobey the octet rule? A. BH3 B. NH3 C. PH3 D. H2S E. None of the these 82. An unknown molecular compound has the following Lewis structure. Which of the following elements could be the identity of X? O X O O A. Si B. P C. S D. Cl E. Ne 83. Which of the following has bond angles closest to 120°? A. B. C. D. E. CO2 H2O SO2 CH4 NH3 84. Draw the Lewis structure for H2S and determine its approximate bond angles and molecular shape. A. B. C. D. E. 90 degrees, tetrahedral 120 degrees, linear 120 degrees, bent 109.5 degrees, trigonal planar 109.5 decrees, bent 15 85. Which of the following molecules is a nonpolar molecule with polar bonds? A. B. C. D. E. NF3 CH2Cl2 CF4 O3 CO Chapter 9 86. Which of the following best explains what happens to a balloon that rises to a higher altitude at constant temperature? (Note: Atmospheric pressure decreases as altitude increases) A. B. C. D. E. The volume of the balloon increases because the pressure inside and outside the balloon decreases. The volume of the balloon increases because the number of gas molecules in the balloon increases. The volume of the balloon decreases because the pressure inside and outside the balloon decreases. The volume of the balloon decreases because the number of gas molecules in the balloon decreases. The volume of the balloon will remain constant because temperature is held constant. 87. Which of the following should be most soluble in benzene, C6H6? A. CH3OH B. H2O C. Br2 D. H2C=O E. CH3-O-CH3 88. Consider the following diagrams representing the same gas under different conditions of temperature and pressure. Which has the lowest density? A. B. C. D. E. A B C D Both B and C A B C D 89. A 2.00-L sample of gas at 1.00 atm pressure is cooled from 30.00°C to −100.00°C in an elastic container such as a balloon. What is the final volume of the gas? Because the container is elastic, the pressure remains constant. A. B. C. D. E. 3.50 L 6.67 L 1.14 L –6.67 L 0.030 L 16 90. Which of the following occurs when an ideal gas sample is increased in temperature? (volume and moles are held constant.) A. B. C. D. E. Pressure increases Average kinetic energy increases Average molecular speed increases All of the above None of the above 91. What is the mass of argon (Ar) gas in a 20.0-liter container given that the pressure in the container is 815 mmHg and the temperature is 298 K? A. B. C. D. E. 35.0 g 667 g 45.6 g 40.0 0.0247 g 92. A mixture of gases contains helium, neon, nitrogen, and carbon dioxide at 298 K. Which gas has the greatest average velocity? A. B. C. D. E. N2 CO2 He Ne All have the same average velocity. Chapter 10 93. In which of the following liquids is London-dispersion forces present? A. B. C. D. E. CH3OH CH3NH2 H2O CCl4 All of the above 94. Which of the following liquids is expected to have the highest boiling point? (Note types of intermolecular forces in each substance.) A. B. C. D. E. CH4 CH3OH CH3Cl CH3CH3 CH3CH2CH3 17 95. The graph below shows the vapor pressure of each liquid as a function of temperature. Which liquid has the strongest intermolecular forces? A. A B. B C. C D. D A B C D Chapter 11 96. Many ionic compounds dissolve in water because A. B. C. D. E. there are attractive forces between ions and water molecules there are no attractive forces between ions and water molecules. the entropy of the solution is greater than the entropy of pure NaCl and pure H2O. the entropy of the solution is less than the entropy of pure NaCl and pure H2O. Both A and C 97. Which of the following increases the solubility of a gas in solution? A. B. C. D. E. Increasing gas pressure and increasing temperature Increasing gas pressure and decreasing temperature Decreasing gas pressure and increasing temperature Decreasing gas pressure and decreasing temperature Adding more water 98. If the solubility of a solid substance is 18.2 g/100 g water, which of the following best describes what is eventually formed after10.0 grams of the substance is mixed with 50.0 grams of water? A. B. C. D. E. Saturated solution with some undissolved solid Unsaturated solution with some undissolved solid Saturated solution with no undissolved solid Unsaturated solution with no undissolved solid Supersaturated solution 99. What volume of a 0.500 M HCl solution contains 2.00 mol HCl? A. 1.00 L B. 2.00 L C. 4.00 L 18 D. 0.250 L E. None of these Chapter 12 100.Consider the following system at equilibrium: FeO(s) + H2(g) U Fe(s) + H2O(g) Given that the reaction in the forward direction is endothermic, which of the following will cause an increase in the moles of iron metal at equilibrium? A. B. C. D. E. Removing H2O vapor Removing Fe solid Removing H2 gas Decreasing the reaction temperature None of these 101. Which of the following is always true when a system is in a state of equilibrium? A. The moles of reactants is equal to the moles of products. B. The mass of reactants is equal to the mass of products. C. The rate of the forward process is equal to the rate of the reverse process. D. The forward process and the reverse process both stop (rates of both are zero). E. The pH is equal to 7. Chapter 13 – 102. Which of the following is the conjugate acid of HSO4 ? A. H2SO4 B. SO42 - C. H2SO4 - D. H3O+ E. HSO3 - 103. Identify the acid reactant in the following reaction. – NH3(aq) + H2O(aq) U NH4+(aq) + OH (aq) A. NH3(aq) B. H2O(l) C. NH4+(aq) D. OH-(aq) E. H3O+(aq) 19 104. Which one of the following is an acid that will ionize completely when dissolved in water? A. NaOH B. HBr C. HF D. NaCl E. NH3 105. Which of the following is considered a basic solution? A. B. C. D. E. 106. A solution with a pH of 5 A 0.10 M solution of HCl A solution with [H3O+] = 1.0 × 10–4 M A solution with [H3O+] = 1.0 × 10–7 M A solution with [H3O+] = 1.0 × 10–10 M What is the pH of a 0.010 M NaOH solution? A. 1.00 B. 2.00 C. 7.00 D. 12.00 E. 13.00 107. When extra water is added to 10.0 mL of an unknown solution, the pH increases by 1.00 pH unit. Does the solution contain an acid or a base, and how much water was added to the solution? A. B. C. D. Acid; 10.0 mL water added Acid; 90.0 mL water added Base; 10.0 mL water added Base; 90.0 mL water added 20 Answer Key 1. D 27. A 53. D 79. B 2. D 28. D 54. D 80. B 3. B 29. C 55. B 81. A 4. A 30. C 56. B 82. C 5. B 31. D 57. A 83. C 6. B 32. C 58. E 84. E 7. A 33. D 59. A 85. C 8. C 34. A 60. B 86. A 9. C 35. E 61. E 87. C 10. D 36. E 62. B 88. D 11. A 37. A 63. D 89. C 12. C 38. A 64. E 90. D 13. C 39. C 65. D 91. A 14. E 40. E 66. B 92. C 15. C 41. D 67. C 93. E 16. E 42. C 68. C 94. B 17. A 43. D 69. B 95. D 18. B 44. C 70. E 96. E 19. B 45. E 71. C 97. B 20. C 46. B 72. A 98. A 21. C 47. E 73. E 99. C 22. D 48. B 74. B 100. A 23. E 49. C 75. A 101. C 24. A 50. D 76. D 102. A 25. B 51. D 77. D 103. B 26. B 52. B 78. B 104. B 105. E 106. D 107. B 21