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Chem103F04T2 - Chem103F04 Exam#2A Name Section DO NOT...

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Unformatted text preview: Chem103F04 Exam #2A October 26, 2004 Name Section DO NOT DETACH YOUR ANSWER SHEET FROM THE BACK OF THE EXAM Place your name and section number of the answer sheet at the end of the exam. For each question, mark the best answer on the answer sheet Mark only one answer for each question 1. What is the correct formula for each of the following Nitrous acid Sodium hydroxide Bromic acid A. HNOz NaOH ,, HBI‘O3 B. HN()3 NaOH HBr03 C. HNOz SOOH I'IBI'O4 D. HNO3 SOOH HBrOz E. HNOz NaOH HBrO4 2. What is the correct name for each of the following FeCl3 NH4N03 SC14 A. Iron(III)ehloride ammonium nitrite sulfuttetrachloride B. ferrous chloride ammonium nitrate sulfur(IV)chloride C. iron(III)chloride ammonium nitrate sulfur(IV)chloride D ferric chloride ammonium nitrite sulfurtetrachloride E. iron(III)chloride ammonium nitrate sulfurtetrachloride 3. Malachite is an ore of copper with the formula: Cu2(OH)2C03. What is the mass percent of Cu in malachite? A. 28.74 B. 45.20 C. 57.47 D. 40.32 E. 22.57 4. 1.000 gram of the anhydrous form of CuSO4 absorbed 0.565 grams of water to make the CuSO4 - XI-IZO hydrate. What is the value of X in the hydrate? A. 1 B. 1.5 C. 2 D. 4 E. 5 5. An iron ore, magnetite, contains only iron and oxygen. If 1000 grams of the ore produced 72.35 grams of iron, what is the empirical formula of magnetite? A. F 60 B. F6203 C. F6205 D. F602 E. F6304 6. Caffeine was found to contain 49.48 % carbon, 5.190 % hydrogen, 16.47 % oxygen and 28.85 % nitrogen. If the molar mass is 194.19 g/ mol, what is the molecular formula for caffeine? A. C10H1402N2 B. C4H50N2 C. C5H7ON D. CngoOzN4 E. C6H602N6 7. Calcium hydride (CaHz) is so reactive with water that it can be used to remove water from other liquids. The reaction is: CaHz (s) + H20 (1) -) Ca(OH)2 (s) + H2 (g) (not balanced) If 24. 6 grams of calcium hydride is added to a liquid that contains 14.0 grams of water, which of the following is true? A. All the calcium hydride will be used up B. All the water will be used up " C. Both calcium hydride and water will be completely used up D. Neither calcium hydride nor water will be completely used up E. There is no way to predict what will remain of the two reactants 8. P4010 reacts with water to form phosphoric acid according to the reaction: P4010 + H20 '9 H3PO4. When 11.00 grams of P4010 was reacted with 12.00 grams of water, the reaction produced 1160 grams of phosphoric acid. What was the % yield of the reaction? A. 78.62 B. 101.1 C. 92.70 D. 84.00 E. 52.73 9. Molarity is defined as: A. moles of solute per 1 liter of solvent B. moles of solute per 1 kg of solvent C. moles of solute per 100 gram solution D. moles of solute per 1 liter of solution E. moles of solute per 1 mole of solution 10. When 100 mL of 0.45 M NaOH was diluted to 250 mL with water, which of the following is true? A. The concentration of NaOH is unchanged B. The concentration of NaOH increases C. The number of moles of NaOH is unchanged D. The volume of solution is unchanged E. None of the above is true 11. 45.0 grams of AgNO; was dissolved in water to make 100 mL of solution. 5.00 mL of this solution was then diluted to 1.00 L with water. What is the concentration of Ag + in the final solution? A. 2.65M B. 2.25M C. 0.0132M D. 0.00225M E. 0.0163M 12. Salts are composed of: a metal cation and a metal anion a nonmetal cation and a metal anion a nonmetal cation and a nonmetal anion a metal cation and a nonmetal anion 53.0.00? 13. With which of the following cations will bromide ion form a solid? A. Ca *2 B. Zn *2 (3. Co *3 D. Fe *3 E. Pb *2 14. What is the concentration of ammonium ion in 375 mL of 3.65 M (N114)2SO4? A. 3.65 M B. 7.30M C. 1.82 M D. 4.11 M E. 1.37M 15. When the following reaction is balanced with the smallest whole numbers, the coefficients are: A1CNO3); + Na2S -) A12S3 + NaNO; A. 2,3,1,6 B. 2,1,3,2 C. 1,1,1,1 D. 4,6,3,2 E. 1,3,1,3 16. What is the coefficient of 02 when the reaction is balanced with smallest whole numbers? C2H40 + 02 -) CO2 + H2O A. 1 B. 2 C. 3 D. 4 E. 5 17. The mass % of Al in aluminum sulfate is? A. 7.886 B. 15.77 C. 21.93 D. 45.70 E. 35.94 18. What is the empirical formula of a compound that contains 27.0 % S, 13.4 % O and 59.6% C1? A. SOCl B. SOC12 C. S2OC1 D. SO2C1 E. C1SO4 19. A 9.27 gram sample of nitrogen (N2) reacts completely with magnesium according to the reactions: Mg + N2 9 Mg3N2. The mass of Mg consumed is? A. 8.04 B. 24.1 C. 16.1 D. 0.927 E. 13.9 20. The combustion of C3Hg produces C02 and H20 according to the reaction: C3H8 + 02 ‘9 C02 + H20 If 2.5 mol of 02 are used, how many moles of H20 will be produced? A. 4.0 B. 3.0 C. 2.5 D. 2.0 E. 1.0 21. What mass of AgCl is produced when 4.22 grams of AgNO; reacts with 7.73 grams of AlC13 according to the balanced reaction: 3 AgNO; + A1C13 9 A1(N03)3 + AgCl A. 17.6 B. 4.22 c. 24.9 D. 3.56 E. 11.9 22. A compound X283 is 53.8 % X. What element is X? A. Fe B. Cl C. Mg D. Ar E. Al 23. Which of the following is not a strong electrolyte? A. HCl B. I'fNOg, C. HC2H302 D. HBI’ E. H2SO4 24. In a reaction between KOH (aq) and HN03 (aq), what are the spectator ions? A. K+ and H+ B. H+ and OH‘ c. Kfand N03 ‘ D. H+ and N03“ E. OH'and N03‘ 25. In a reaction between BaIz and K2804 in solution, what is the net ionic equation? A. Ba+2 + 21' -> Balz B. K + + I” 9 K1 0. 2 K+ + 304—2 -> K2504 D. Ba *2 + so4 ‘2 —> BaSO4 E. Ba+2 + 2K+ 9 BaKz 26. Which of the following is soluble in water? A. F 63(PO4)2 B. FC(OH)2 C. Fe(N03)2 D. FCC03 E. F CS 27. A strong electrolyte is one that completely in solution. A. reacts B. dissolves C. decomposes D. disappears E. ionizes 28. How many grams of barium iodide are contained in 250.0 mL of a 0.193 M barium iodide solution? ' A. 9.44 B. 18.9 C. 0.024 D. 0.048 E. 37.7 29. How many mL of 0.827 M I'INO3 are needed to completely neutralize 35.00 mL of 0.737 M Ba(OH)2 ? \ A. 35.0 B. 1.12 . C. 25.8 D. 62.4 E. 39.3 30. Which of the following would require the largest volume of 0.100 M sodium hydroxide for complete neutralization? A. 10.0 mL of 0.0500 M phosphoric acid B. 20.0 mL of 0.0500 M nitric acid C. 25.0 mL of 0.0200 M sulfuric acid D. 15.0 mL of 0.0500 M hydrobromic acie E. 10.0 mL of 0.0500 M perchloric acid 31. What is the concentration of Ba +2 in a solution made from mixing 30.0 mL of 0.50 M B3(NO3)2 and 40.0 mL of 0.40 M Na2804? A. 0.50 M B 0.014 M C. 0.015 M I D. 0.00 M E. 0.025 M 32. The gain of electrons by a species is called? A. reduction B. oxidation . C. disproportionation D. fractionation E. sublimation 33. When the following reaction is balanced in acid, water appears on the , and the coefficient of H20 is 7 0207 '2 + $203 '2 '9 Cr +3 + S406 “2 A. lefl, 7 B. left, 14 C. right, 7 D. right, 14 E. left, 6 34. What is the reducing agent in the following reaction? 14 H++Cr207_2 + 3 Ni -—) 3Ni+2+2 Cr+3+7H20 A. H+ B. Cr207‘2 c. 3 Ni D. 3 Ni *2 E. 2 Cr *3 35. When the following half reaction is balanced in acid, how many electrons are involved? \ MnO4 ‘ —) Mn *2 i A. 2 B. 4 C. 5 D. 7 E. 9 36. What is the coefficient of Fe +3 when the following reaction is balanced in base? CN”+Fe+3 9 CNO‘+Fe+2 A. 1 B. 2 C. 3 D. 4 E. 5 37. How many mL of a 0.30 M C10 ' solution are needed to completely oxidize 20.0 mL of 0.40 M 8203 ’2 to S04 ‘2 in a basic solution? 010’ + 5203-2 —> c1“ + 304-2 A. 106.7 B. 26.7 C. 53.4 D. 13.3 E. 66.7 38. When the value of Q is the process is negative, endothermic negative, exothermic positive, exothermic zero, exothermic zero, endothermic mpow> 39. When a sample of aluminum absorbed 9.86 J of heat, the temperature increased from 23.2 K to 30.5 K. If the specific heat of aluminum is 0.90 J/ g-K, what was the mass of the sample? A. 72 B. 1.5 C. 65 D. 8.1 E. 6.6 40. The specific heat of lead is 0.13 J/ g-K. How much heat in joules is required to raise the temperature of 15 g of lead from 22 °C to 37 °C? A. 2.0 B. —o.13 c. 5.8x 10“ D. 29 E. 0.13 41. 55.0 grams of water at 69.0 °C was added to an unknown amount of water at 22 °C. The final temperature of the combined water was 31.0 °C. How many grams of water were initially at 22.0 °C? specific heat water = 4.184 J / g-K A. 232 B. 13.0 C. 0.0768 D. 0.0431 E. 287 42. 50.0 mL of 1.0 M HCl was mixed with 50.0 mL of 1.00 M NaOH. The temperature of the resulting solution went from 23.0 °C to 29.8 °C. The density of the solution was 1.0 g/ mL and the specific heat of the solution was 4.184 J/ g-K. Which of the following statements is NOT true. A. The reaction was exothermic B. 2.8 U of heat were transferred during the process. C. For this process, Qm= - 2.8 kJ D. The heat flow wwas measured under conditions of constant pressure. E. The reaction was endothermic 43. A Calorimeter is: A. equal to the molar heat of a reaction B. a dieting aid C. an indicator of a spontaneous rection D. a device used to measure the transfer of heat energy E. used to measure the amount of heat released by an endothermic reaction 44. The specific heat of gold is 0.129 J/ g-K. What is the molar heat capacity of gold? A. 0.039 B. 0.129 C. 25.4 D. 39.0 E. 197 45. An endothermic reaction causes the surrounding to; A. warm up B. become acidic C. condense " D. decrease in temperature E. release C02 46. The heat required to raise the temperature of one gram of material by one degree Kelvin is called? A. Heat capacity B. Specific heat C. Molar heat capacity D. Calorimeter E. Heat of neutralization 47. A bomb calorimeter: A. explodes g B. measures a reaction at constant pressure C. measures a reaction at constant volume D. measures the volume of the reaction gases given off E. measures the amount of solid product produced in a reaction 48. What is the total volume of gas produce when 50.0 mL of C12 reacts with 75.0 mL of CH4 in the reaction: C12 (g) + CH4 (g) -) HCl (g) + CH3C1 (g)? A. 100.0 mL B. 125.0 mL C. 50.0 mL D. 75.0 mL E. 0.0 mL 49. What volume in mL of 802 can be produced from the reaction of 3.82 g 01803 and excess HCl at 827 torr and 44 °C? C3803 = 120.1 CaSO3 (s) + 2 HCl (aq) -) 802 (g) + CaC12(aq) + H20 (1) A. 0.761 B. 0.105 . C. 105 D. 761 E. 31.8 50. What volume in liters of NH; gas is produced from the complete reaction of 7.5 g H20 when the following reaction is carried out at STP? MgsNz (S) + 6 H20 (3) '3 3 Mg(0H)2 (aq) + 2 NH: (g) A. 0.42 B. 3.1 C. 0.14 D. 9.4 E. 56 i 51. The common constituent of all acid solutions is? A. H2 B. OH" c. H2804 D. H+ E. Cl’ 52. What is the formula of the salt formed from the neutralization of hydrobromic acid “and calcium hydroxide? A. CaO B. CaHz C. CaBr D. CaBrH E. CaBrz . .... z... . . . ..... I ..... I ..... Ill 3:. I r... I . .... "an" n n D n .o- .2. .3 L... 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