key2_white - ID A CHEM 1211 Test II Multiple Choice(3...

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Unformatted text preview: ID: A CHEM 1211 Test II Multiple Choice (3 points each, place answer on bubble sheet) 1. A molecule is found to contain 47.35% C, 10.60% H, and 42.05% 0. What is the empirical formula for this molecule? a. CzHgO b. C3H402 © cgngo2 d. C4H602 e C4H303 2. A 2.000 g sample of CoC12-xH2O is dried in an oven. When the anhydrous salt is removed from the oven, its mass is 1.565 g. What is the value of x? 1 2 3 4 6 b e alanced equation for the complete combustion of benzene, CsHs, .is C5H5(l) —> 6 C(s) + 3 H2(g) 061160) j'” 12 H200) —> 6 COKE) + 15 H2(g) CsHsU) + 02(3) -> 002(g) + H20(g) 2 CsHs(1)+ 9 020;) —> 12 CO (3) + 6 H20(g) Ce) 2 0611511) + 15 0.19 a 12 002(3) + 5 H20(g) 4. Copper reacts with nitric acid to produce copper(II) nitrate, nitrogen dioxide gas, and water. 9° P‘PP‘PQQP—P Cu(s) + 4 I-1'N03(aq) —> Cu(N03)2(aq) + 2 N02(g) + 2 1120(1) : If you have 0.500 moles of Cu, 3. you need at least 0.125 moles of HNO; to produce 0.500 moles of Cu(NO3)2 b. you need at least 0.250 moles of HNO; to produce 0.500 moles of Cu(N03)2. CD you need at least 2. 00 moles of HNO3 to produce 0 500 moles of Cu(NO3)2. d. you need at least 2.00 moles of HNOg to produce 1.00 moles of Cu(N03)2. c. you need at least 2.00 moles of I'IN03 to produce 2.00 moles of Cu(N03)2. 5. The reaction of water and coal at a high temperature produces a mixture of hydrogen and carbon monoxide gases. This mixture is known as synthesis gas (or syngas). What mass of hydrogen gas can be formed from the reaction of 51.3 g of carbon with excess water? (3(3) + 1120(3) —) H2(g) + COG) a. 4.31 g @ 8.61 g c. 17.2 g d. 1.20 x 102 g e 306 g 1]):A 6. What is a correct method for determining how many grams of oxygen react with 1.00 gram of pentane? CsHu2(g) + 3 02(8) *+ 5 002(g) + 6 H20(g) 111101ch12 8m0102 32.00g02 1.00gC5H12 72—15g_ lmolCSle 11110102 — lmoleHu lrnolQ2 ' 32.00g02 b. 1.00ngle 72,15g 31.119lele 11110102 _ 72.15molC5Hl2 8m0102 , 16.00g02 c. 1.08ngle 1g 111101C5H12 11110102 _ . 72.15g lmolcan 32-00150: (‘1. 1.00gC5H12[T-m'2'] 31110102 1m0102 — 72.15g 11110lele 11110102 ' e. 1.00ngHu lmolcsflu mgmoloz 32.00.302 ' 7. Nitric oxide is made from the oxidation of ammonia. How many moles of nitric oxide can be made from the reaction of 3.80 mol NH; with 5.15 mol 0;? 4 NHs(g) + 5 020;) —> 4 N0(g) + 6 H20(g) 3.80 mol . 4.12 mol 0. 5.15 mol (:1. 6.44 mol e. 8.95 mol 8. Which of the following compounds will be soluble in water: KNOg, Ca;(PO4)2, CuClz, and Fe253? a. KN03 and 0330002 @ KN03 and CuC12 C. C33(P04)2 and F8283 d. CuClz and Fe2S3 e. KNOg, (33,30,002, and F6233 9. What is the net ionic equation for the reaction of aqueous 1ead(II) nitrate with aqueous sodium bromide? a. Pb(NO3)2(aq) + 2 NaBr(aq) —) PbBr2(aq) + 2 NaN03(s) ' b. Na+(aq) + N03'(aq) —> NaN03(s) ' C9 Pb2+(aq) + 2 Br(aq) —> PbBr2(s) d. Pb2+(aq) + 2 Na+(aq) —> PbNa2(s) e. Pb(N03)2(aq) +2 NaBr(aq) —> PbBr2(s) + 2 NaN03(aq) 10. Which of the following compounds is a weak base? a. LiOH b. KCl 0. CH3C02H d. Sr(0H)2 .NHs ID:A . Which of the following species are strong acids. HNO3, HBr, H3PO4,CH3COZH, and H804 ? 11. HNO; and 1-113!" 13. PIN-03 and H3P04 c. I-IBr and HSO4' d. H3PO4, CH3C02H, and H304- e. HNOg, H3PO4, and HSO4' Wn te a balanced equation for the reaction of aqueous solutions of baking soda and acetic acid. 126 NaHCOg(aq) + CH3C02H(aq) —) NaCH3C02(aq) + H200) + C02(g) . 2 NaHCO3(aq) + CH;COZH(aq) —> 2 Na2C03(aq) + CH4(aq) + 211200) + C02(g) c. NaH003(aq) + CH3CO;H(aq) —> H2C03(s) + NaCH3C02(aq) d. NaHC03(aq) + CH3C02H(aq) —> NaOH(aq) + CHgCOgH(aq) + 002(g) NaHCO3(aq) + CH;CO;H(aq) -) CH4(aq) + 2 C02(g) + 02(g) + NaOH(aq) 13. Which molecule in the reaction below undergoes oxidation? 2 C2H2(g) + 5 02(3) —> 4 C02(g) + 2 1120(3) (3sz .. 02 C. H20 d. CO; e. C2H2 and 02 14. What is the oxidation number of each atom in sodium perbromate, NaBrO4? a. Na=+1,Br=-1,0.=-2 b. Na=+l,Br=+l,O=-2 g) Na=+1,Br:+7,0= -2 . Na=-1,Br=-1,0=+2 e. Na=+1,Br=-l,0=0 15. If 5.15 g FeCl3 is dissolved in enough water to make exactly 150.0 mL of solution, what is the molar concentration of chloride ion? - a. 0.103 M b. 0.212M c. 0.578M 16. What voiume of 0.300 M NaCl is required to precipitate all the Pb2+ ion from 25.0 mL of aqueous 0.440 M Pb(N03)2? ' Pb(N03)2(aq) + 2 NaCi(aq) —) PbC12(s) + 2 NaN03(aq) a. 17.0 mL h. 36.7 mL 733 mL . 84.4 mL e. 147 mL 1]):A 17. Which one of the following statements is INCORRECT? a. Energy is neither created nor destroyed in chemical reactions. b. Kinetic energy is the energy associated with motion. @ Exothermic processes transfer heat from the surrounding into the system. (1. Increasing the thermal energy of a gas increases the motion of its atoms. e. Energy is the capacity to do work. 18. If 136 J is required to change the temperature of 8.75 g of nickel by 35.0 K, what is the specific heat capacity of mercury? a. 0.0294 J/g-K b. 0.311 J/g-K c. 0.417 Jig-K 0.444 J/g-K e. 2.25 J/g-K 19. What is the mass percent of chlorine in iron(II) chloride? a. 14.0% b. 28.0% c. 44.1% 55.9% c. 66.7% - 20. Disulfur dichloride is produced by reacting chlorine gas with molten Sulfur. ‘ 53(1) + 4 012(3) —* 4 3202(3) What is the percent yield if 6.25 g S;C12 is isolated from the reaction of 10.0 g 83 and 7.50 g 012‘? a. 19.9% ' b. 29.7% - c. 31.4% d. 35.7% 43.8% . 21. $110 mole of each of the following compounds is dissolved to a volume of 1.0 L in water, which one will have the highest concentration of dissolved ions? 3. HF b. NaOH 0. MgSO4 © AKNOsh 6. C312 22. What is the oxidation number of iodine in 103“? a. -1 - b. 0 0. +3 0 +5 6. +7 ID:A 23. What are the spectator ions in the reaction between aqueous perchloric acid and aqueous potassium hydroxide? . ' HClO4(aq) + KOH(aq) —> H200) + KCIO4(aq) a. H+, (3104-, K: and 0H- b. H+ and OH- @ K and 0104- d. H+ and 0104- e. K+ and 0H- 24. What is the net ionic equation for the reaction of aqueous sodium carbonate with aqueous iron(III) chloride? 3 Na2CO3(aq) + 2 FeCla —> 6 NaCl(aq) + Fe2(C03)3(s) a. 3 Na+(aq) + Fe3+(aq) —) Na3Fe(s) b. Na+(aq) + C1-(aq) —> NaC1(s) c. 3 Na2C03_(aq) + 2 FeC13(aq) «—> 6 NaCl(aq) + Fe2(CO3)3(aq) 2 Fe3+(aq) + 3 Cng-(aq) -> Fe2(C03)3(s) e. Cng-(aq)_+ Cl‘(aq) -) C02(g) + C120(s) 25. Which species in the reaction below undergoes reduction? Sn(s) + 2 H+(aq) —) Sn2+(aq) + H2(g) :2 c. Sn2+ d. H; e. No compound is reduced. _Test II - A (10 points) Determine the empirical formula for the compound with the following compositions by mass: 21.7% C, 9.6% 0 and 68.7% F. C ”Ezemfiww ~7 0/173. . I. 50.,» a 12.0%, tux-:5 94: ’9 “Meow z: 0.50,); F £87357 687?"? ég—é/lflgfl: Bé-QmQ CH; 004»? [35.1.2 7:: (El-E 9145.?- 5.5: 0, f, 0' 60 0.619 c 30’? fl (5 points) Predict the oxidation number of the bold face element in each of the following compounds or ions: Br03' 9+5 HSO4' l.._—_>+é N205 L445" (10 points) Disulfur dichloride, 82C12, is used to vulcanize rubber. It can be made by treating molten sulfur with gaseous chlorine: 33(1) + 24 F2(g) ') 8 SF6(S) Starting with a mixture of 32.0g of sulfur and 71.0g of Cb, what is the maximum mass of SF5 that can be obtained? 5 ' F 320 ., *7: 3 %5L%xot12m Ax” Alma 855 x m5 " I 87 x: o‘eQBM 355 ;(o.523u)0%%2) - : (€0.93- ...
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