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Practice Exam II - Fall 2006 Exam ll Morlino There are 25...

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Unformatted text preview: Fall 2006 Exam ll Morlino There are 25 questions plus 2 bonus questions on this exam. Please read each question CAREFULLY and select the BEST answer. Each question is weighted the same. 1) How many moles of oxygen atoms are there in 2.25 moles of BaSOg? 4.00 moles 4.50 moles 1.00 moles 9.00 moles 2.25 moles 2) Calculate to five significant figures, the molecular mass of the compound diphosphorus pentaoxide. 141.94 g 46373 g 141.94 amu 46.373 amu none of these 3) To calculate percent yields one should use mass quantities only mole quantities only either mass quantities or mole quantities neither mass quantities nor mole quantities mass percents 4) Calculate the mass, in grams, of 0.333 mol C02. 13.3 9.33 14.7 12.5 44.0 A-1 Fall 2006 Exam ll lVlOTllIlO 5) Suppose that Morton Lite Salt has 254 mg of sodium (as Na+) and 370 mg of potassium (as K+) per 0.25 teaspoon. Assume that 1.0 teaspoon of the Lite Salt has a mass of 6.0 g and that the Na+ comes from NaCl and the K+ from KCl. Calculate the mass percent of NaCl in Lite Salt based on this data. 47% I43% 41% 59% none of these 6) A reaction which produces crude iron from iibh ore is shown below: Fe203 (s) + 3 CO (g) a 2 Fe (8) + 3 C02 (g) How many moles of iron could be. produced from the reaction of 10 mol Fe203 and 25 mol of CO? 10 '35 25 17 37.5 ' 7) When the following equation is balanced with lOVVESl ratio whole number coefficients, the coefficient of C02 is C4H10(g) + 02 (s) a C02 (s) + H20 (1) UI CZJ‘QCF 8) The empirical formula of the reduced form of lactobionic acid, a sugar used in some medicinal agents, is CHZO. The molecular mass of this compound is 360. What is the molecular formula? CHZO C19H4Os C16HZ409 C360H7200360 C12H24012 A-2 Fall 2006 Exam II Morlino 9} Which of the following could be an empirical formula? C60H60 C3H8 C2H6 C5H] 206 C2H2C12 10) What would be the molarity of a solution obtained by diluting 125 mL of 6.00 M HCI to 500. mL? 1.50 10.4 1.25 0.667 24.0 11) A solution is 0.0270 M KI and 0.0246 M Mglg . What volume of water should be added to 100.0 mL of this solution to produce a solution with [I‘] 2 0.0515 M? 0.00 ml 14.8 mL 48.0 ml. 148 mL none of these 1?.) Calculate the molarity of Br‘ ions 111-250. mL of a solution containing 25.9 g NaBr gmd 0.155 moles of HBr. 0.155 1.00 n93 1.55 Additional information is necessary. 13) Which one of the following substances would you expect to be a nonelectrolvte in aqueous solution? CH3COOH HBr CHgCHZOH KI NH3 A-3 Fall 2006 Exam H Morlino l4) Vinegar is an aqueous solution of acetic acid, CH3COOH. A 5.00 mL sample of a particular vinegar requires 26.90 mL of 0.175 M NaOH for its titration. What is the molarit}; of acetic acid in the vinegar? 0.942 1.04 0.520 0.175 0.47] 15) Which is (are) the spectator ion(s) in the following precipitation reaction? (NH4)3P04 (aq) + A12(SO4)3 (act) eAlPOzi (s) + (NH4)2SO4 (mi) 103+, 3042+ NH4+ A139“, PO4— may, 5042— NH4+, P04- 16) The net ionic equation that describes what happens when solutions of Ba(OH)2 and NaN03 are mixed is: Na+ (aq) + 0H4 (aq) a NaOH{s) Ba2+ (aq) + 2 OH' (aq) —> Ba(OH)2 (s) Na+ (aq) + N03; (aq) #9 NaNO3 (5) Ba2 + (aq) + 2 N03‘ {aq) % Ba(NO3)2 {5) none of the above 17) What is the oxidation number of chromium in Cr2072‘? +3 +4 +2 +6 V?) A~4 Fall 2006 Exam ll Morlino 18) What is the oxidation number of chlorine in HClOg? +7 —1 +1 +3 -3 19) Regarding the following reaction, What statement is incorrect? Ms+Cu2+ (as) -> Ms2+ (act) + Cu Cu2+ is oxidized. Cu2+ is the oxidizing agent. This is a redox reaction. Mg is the reducing agent. Mg is oxidized. 20) Which of the following statements is correct concerning the activity of metals? Zn will react with Pb. an + wiil react‘with Pb. Pb will react with 2112+. Pb2 + will react with Zn2+. Zn will react with Pb2+. 21} Which of the following is a strong electrolyte? CHgCOOH C6H6 HCi H 20 HCOOH 22) How could you tell the difference between an aqueous salt solution and a sugar solution without tasting them? A sugar solution conducts electricity but a salt solution doe not. A salt solution conducts electricity but a sugar solution does not. Both solutions conduct electricity but salt is a stronger electrolyte. Neither solution conducts electricity but molten salt does conduct electricity. none of these A—5 Fall 2006 Exam II Morlino 23) In a reaction, a reducing agent is reduced in a reaction. lowers the oxidation number of another compound. causes the oxidation of another compound. gains electrons. is a spectator ion. 24) in which of the compounds shown below is the sulfur most oxidized? Na2504 SgClZ % Na£03 H28 25) A redox titration and an acid—base titration differ in that the solution of known concentration jd’f in one is called the titrant and in the other is called the analyte. an redox titration uses an indicator whereas an acid—base titration uses a pH meter. a redox titration involves transfer of H+ whereas an acid—base titration involves transfer of electrons. There is no difference in the two types of titrations. I none of these is correct Bonus 26) A student needs 623 g of zinc sulfide, a white pigment, for an art project. He can synthesize it using the reaction given below. No.28(aq) + Zn(NO3)g(aq) —> ZnS(S) + ZNaN03(aq) How many grams of zinc nitrate will he need if he can make the zinc sulfide in 83.0% yield? Assume he has plenty of sodium sulfide. 1460 g 1210 g 904 g 6050 g 605 g Fa112006 Exam II Mnrlino 27) A 6.00 “o NaOI-I solution by mass has a density of 1.054 g/mL. What is its concentration in molarity? 0.150 M 1.90 M 0.001 M 1.58 M 0.790 M A-7 ...
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