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Midterm%202 - Midterm 2 Key 1.rp mi Aluminum reacts with...

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Unformatted text preview: Midterm 2 Key 1..rp. mi Aluminum reacts with oxygen to produce aluminum oxide which can he used as an adsorbent, desiccant or catalyst for organic reactions. 414.1(3) + 30213} —} 21411030") A mixture of32.49 g ofaluminum (M = 26.98 gtmol] and 1.1165 g of oxygen (M = 32:00 ymol] is allowed to react. Identify the limiting reactant and determine the mass of the excess reactan present in the vessel when the reaction is complete. .4. Aluminum is the limiting reactant; 16.?0 g of oxygen remain. i3. Aluminum is the limiting reactant; 35.16 g of oxygen remain. 5;: Aluminum is the limiting reactant; 44.24 g of'oxygeu remain. 1'). Oxygen is the limiting rcactanttBil E- g of aluminum remain. |.. Oxygen lathe l1rntt1ng reactant, 19.31 g of lu‘rnmfium rema1 1 T1. amhfisfis {marl Eirfl‘ltfi'x MW e %%= 1-5” ml- at u -. 01.: ”1;ij £i32:3)1‘ EMIWDIL- 31.45;; M H . A gentle; _ am 1 m. .. = [BMW %)nu:aWfi—_ L1?” . ...t . 41% mass at- $1, rude-l : 2.1515an sis-2;; = 13.395315 re‘m‘Jao‘hzil-ieifng '3 2. .59. m; Sodium hydroxide. also known as caustic soda, is used to neutralize acids and to treat cellulosa in making of cellophane. Calculate the number ofmol'es of solute in LETS L of 1.356 M NaOH solution. :1. 11.091383 mol assume smile. = WV:1-555MKI-5’13'bsltsttts’tw [10.3932 mol t}. 1.383 real |-.. ll.'l'232 mol 3. (p. :2!) When 2.61 g of solid NazC03 is dissolved in sufficient water to make 250. mL of solution, the concentration of Na2C03 is: b 1 “NJ, .. 2. $00.02ko Sivmfia. o]- Nacmg - I} x [Linaarmultixww 13 C. 0.205 M = 0. Dig-6 mu).- 1:). 0.0246 M M. D o 2 fi‘ lm M L [11-1, 10.4 M olm‘ : w - .. . I3 LS’OJIML X L— - 0.013! M 4. (p. :24) How many mL of concentrated nitric acid (HNOg, 16.0 M) should be diluted with water in order to make 2.00 L of 2.00 M solution? X 62.5 mL , _ = g 250. mL M‘ V‘ M’ V“ . (.1500. mL mam: V; : 2.00M x 2.0111” ,1"). 32.0 mL 1229:.125mL V1; :-. 0.2.510 L, -.:. 3,30, ML/ 5. (p. 125) How many milliliters of 1.58 M HCl are needed to react completely with 23.2 g of NaHCO3 (M = 84.02 g/mol)? HCl(aq) + NaHCO'3(s) —>-'NaCl(s) + H20(l) + 002(3) 1 A638 L . __ 23.2. J_“_“L.—~=_ H.5362L ‘9. mm 0" ’0“st " 1): Wu} 0- 3-7-5 luv-Q {'.I‘..276mL at. mph. of Ha; ha rend" mph/M) mu. aubuwl 4%.ij fil'fimL 13.572111}, : 0-176 M g JMl-ul 1M Mal-LL05 7-“- 0-3-76 IM.Q_ Ms ‘ o, 176M V:- T: 'LWM 3""75L’2’Ei‘}: 6. (p. :43) How many moles of ions are released when 1.6 mol of ammOriium phosphate, (N H4)3P04, is dissolved in water? A. 1.6 mol 'i' 1;. 1-3. 0.40mol @144)3'P0ow17 3 W4 WI) + pm? (91/ Q 6.4 mol l..).4.8mol Lbs-wall —_> 2.7:! (and? + I AM 125. 3.2 mol m l>- Ll- War-2v 7. (p. m; How many sodium ions are present in 325 mL of 0.850 M N32804? £39 A 4.99 x 1023 sodium ions to; “who of No... 50+ :..-~ 335- »le “max 0.951: M g 3.33 x log-sodium ions (r. 1.57x 1024 sodium ions -— o no mol. 3.13.1.66x1023sodimnions F” ‘M' “M 50o. “9 1 m9; Mof i-.€.6.20x102350diu111i0n5 5, 5.375 not or. Uflx3dq a 2“,;75m3935; WM ‘1' MLtirqu ht.) NO: O.§Sflx 6_61L)§l035: 5'35 K1013 “41+ 5| 8. (p :42) Which of the following solutions will be the poorest conductor of electrical current? ‘Llithium hydroxide LiOH(aq)&-.__ 5.11”! l9“... c l L‘ a. 34-0! l5 sulfuric acid, H2304(aq) 'h-—...__ h “a d Ll W C sucrose, C12H2201 I (99') 23 sodium chloride NaCl(aq) W ”m? Elecl'n ljk sold-m WALL-vb} Lfitfl'fl‘fl iii. potaSsium nitrate KN03(aq_)k_.-v"——_ .. 9. (p. 148) Select the precipitate that forms when the following reactants are mixed. Na2C03(aq) + BaClz(ag) —> $353). Ute-w; M) + “wk—”Ll WENM *‘E‘wic‘d C . NaClz . . aO 31133512003 / V‘ “l” Sol-Jive 51m. Natl 3 channel? soflotu UM Madge Lu. +£44- EACCM. (fin-Jolly. Mo. pY-lepfh'ul-Q. 10. fit). H8) Select the net ionic equation for the reaction between sodium chloride and mercuryfl) nitrate. 2NaC1(aq)+ Hg2(N 092019) —> NaNOaiaq) + Hg2C12(S) A Hg2: (M) w» Hg_2(S) what. 3 Hg;2 (aq) + 2C1 (aq) —> H_nglz(s) - _ ; {3. NaCl(aq) —> Nag-(cg) + Cl (aq) YUM 4 [0" [an LL W A“ :3 e. Na+(aq) + N03 (09) —> NaN03(aq) _ E3, Hg2(N03)2(aq) —> Hgf‘iaq) + 2N0; (aq) T941! 4 ‘1». cmou (HM H11; HHW MW e “13 m) mu cw —=> ”a cute, Wit-W92 11.{p. 35;) Which of the following is a weak acid? i HF B. HN03 C. HCI W a r; .4 If). H2804 E S J 5 E. HBr 12. (p. :53) Select the net ionic equation for the reaction between lithium hydIOXide and hydrobromic acig. LiOH(aq) + HBrLaq) —> H200) + LiBr(aq) i. Li*(aq) + 01g (aq) + H+(aq) + Br (aq) —> H200) + LiBr(aq) [-3, Li+(aq) + 31' gag) —) LiBr(aq) C. H+(aq) + OH (aq) —> H2_O({) E3 HBr(aq) —) H +(aq) + Br (a9) i:.;. Li0H(aq) —> Li (aq) + OH (aq) Tobi” “0"“ ark.- "' "i W {'OH (‘1)41-4 +t°1)+8 ‘5) emu) +b.‘ / ..._> w 9%) +5H'cw Amati—J chin—p 13. m. :54; Automobile batteries use 3.0 M H2504 as an electrolyte. How much 1.20 M NaDl-l will be needed to neutralize 225 mL of battery aeid? H3304Efl'q} + ZNaDqu) —} ZHgUfl‘) +NagSO4fioq) _ l L fill'éUI—JL H “LUBE G1. HoSe‘ it'd. = 30“ $5.43 We; [cu-uh” (Coleen = ”-i’ 75' “'1‘ . ESL . * ijgjfiL 1.1: mph ”F ”ant l-a L”? ML” M'i- 1-»:me 54535 “”1 Helm?- 1' e.b7'>' Ml K .1 = ”‘3- M “k M M“: I“; HIE-1;; VJl : -——- _ 0.1 V. V=%L: %P_: llbg'bfie’uiL 14. (p. we; Select the best statement relating to'the following reaction: 2Mn0;(s] + KCIOfioq} + 2KOH(aq) -—r ZKMoD4{nq] + KCHoq) + H3013} .1. H in KDH is oxidized. iii. 0 in KClD; is the oxidizing agent. if. K iri KICK}; is the reducing agent. _D_. Mn in MM): is oxidized. ii. C1 in KCID; is the reducing agent. D -M Tub-1 4"? +1 +3: :H-Ht +l+ -:_ +. -t +1 -L We... WW Wow-r2; D .M'J. _ nut 15. .rp. Jew The oxidation numbers of P.- S and Cl in Ham]; H25 and KC1CI4 are, respectively 1233113? * H -=~ - 22- +' e -2~ g+i.—é.+7 Hove... , Hes . #610... L). -l= -2.+3 I-. -l, -2, +7 115. r12. m; Winch one of the followmg 15 not a redox reaction? +I ‘L e. melee} —w Home + Bag) . eHfiifiJ—r em ,1 -|: :1..ng il.N1[g)+ 31-12(3) —} 214mm} fl W E BaClztae) '+ Kzflrodeei —3 BeCrOatae) + EKCli-se) o1 g 5.. 2.42%} a 2142th + 02(3) 5) *Fhfigf‘U-a e—Clgfll +115ng 2‘. 2.511(5) + FE;D§{'I} —} A130 3(3) + 2Fefs] 14-3 (—-—---:-l—-"""_;D Villa)? 1Hv$bL“U-ee.u.0 f2J+:L%J Weax 1——_.__._...' M r. .. Linnea; )MHflfi) mi... _ re. --t +2. H 'L “H "" Ho fiber-j: h. 0-H“; Ball's. H} 4' kn Cat-dot?!) fiflxflv‘oe W‘ 5'- MW) he rad-Ix. 1? (cl. my Balance the following rcdox equation using_ the smallest integers possible and select the correct coefficient for the hydrogen sulfite ion H303. Mnfl4 {mg} + H303 (mg) + I-fiaq) -—r _Mn2. (seq) + SO42 {my} + H;O(l} 11—. 5 [T [U +7 -L_ (.13 MM} m + S emf: J t. +30 1‘ +5109: a t flew; “v3 [-3.2 Lu.- “2' 13. Hp. :33; A system that does no work but which receives heat from the surroundings has: error? _ secessru ‘55 "1*“; t'_q=-ss “M. «tr—e IJ.qefl,eEsD r3 >9, M. HQ 515% memo-shut— lE'.H-'=.e.E eEr‘f >0 19. rs. 2323‘: A system delivers 225 J of heat to the surroundings while delivering 645 J of wotk_ Calculate the change in the internal energy, as; of the system. asset - H—ZZSJ N5 = i-t-vd gusset _, [3.4sz ‘f: 1.15 J gent be: -£.Wj 43E :(-2erj+{-thrs) = -3ToJ 2t}. ca. 2441 Cold packs whose temperatures are lowered when ammonium nitrate dissolves" In water are carried by athletic trainers when transporting ice is not possible. Which oi the following is true of this reaction? _ M | 1 i Mi, 1' .1. of? ‘16. process is endothermic ill-Dull 5 ' j . hj H” 5 h“ i 1M1" := IEI= process is endothermic “la-”NOE” kw“ ‘- , l’.'. M *4 0. process is exothermic Mel l}. a}! = ll. since cold packs are sealed a“ )0 FL. aHs- 0. process is exothermic 214p. 2411; Natural gas. or methane. is an important fuel. Combustion of one mole of methane releases BEBE: kilojoules of energy. How much energy does that represent in kilo'calories? 11. 3,313 x 1113 ken] 11.1.92 x lo" kcal 91:11. Hca' 365;)M x(_[___. : DIE-13.11 {3.3.36xifl'5kca] | lpflfi? _1;1_.1.92xlfl_1kcsl = Fifi? Into—E ii. 1.92 x in ‘ kcal 22. (p. 2ch Ethylene glycol. used as a coolant in automotive engines, has a specific heat capacity of 2.42 “(g-K}. Calculate q 1when 3.65 kg of ethylene glyCol is cooled fi‘om 132°C'to 35°C. ”'1. 43.42 M llilifllllm ‘3= 0 W 'sT l}. -99|e.l : W: Lazaro 341,31? 1 5 iii/Ff Wigs-[330W ”Lt-.1511: 11:53" fi'q-lokj WM 5: new t-o 5% static... au- {Pate 2W—FWEJ 23'. (p. 2st A common laboratory reaction is the neutralization of an acid with a base. When 50.6 mL of {1.500 M HCI at ZSJUT is added to 50.0 mL offljflfl MNaDH at 25.fl°C in a coffee cup calorimeter, the temperature of the mixture rises to 232°C. 1What is the heat of reaction per mole ofacitl? Assume the mixture has a specific heat capacity of 4.1 8 Mg - K} and that thedensities ofthe reactant solutions are both LDU gme. Thu. .hhd ”A,“ g 5“.” + In,“ mL: In In L iii-1230i; mg” it “14:1: “-4 = tar-amt, x1.fl'fi3/ML r. cm 1*. Essie 5° "7'“ ' l“ “L “W“ ”eh-=5 : t-w. — not: eta-23! tie-113D to {i 51" afielcfifi ' ”4 t-..sch .: this 3' ‘bMtf that RH»- W—h’fi'eh; gearflxajcen : musmu-i {+0th reach-q tutti. mam} [331.5 J' + . . :3 my . #:5'.tl“xcu3' F'w must Mel—a MW in” “'1‘ 1‘ withheld M" films} 24. (p. are; Calcium hydroxide, which reacts with carbon dioxide to form calcium carbonate, was used by the ancient Romans as mortar in stone structures. The reaction for this process is: Cami-[ha] + (302123} —) Caflflgts) + Hzfllg), M = -ss.1 kJ What is the enthalpy change if 3.3 mol of calcium carbonate is famed? _ a. J3 Id 5',“ 4.” 0.1.1; 1mg; (eat; It) PM“ a wnyrtmk {-9 AH = 43'.th» it. 459 kl Lel- ea. - t' '. None of these choices is correct. h ”'1 “'4 it-iski . g-sec'ki PM 3.3 MOE, Hz keel- ot- 9.th m- at; E5 25. at. 252; Use Hess's Law to calculate the enthalpy change for the reaction WOflS} + 3H2{g} —l|- “kl-{5) + 3H10(g} from the following data: VIEW J. . = _ " 1-4 _ _ .. 21615) ‘1‘ 302(3) —'+ 2W03(3}. fl}!— lfiBJ-A- kJ It i . “JD-1r? w +110 J. A H ._ [4&25 Jan:- ZHgfg] + 03(3) —:~ ZHEOLgL as — 47134 H J {5} .- a. 252.9 to I i 5 ' = 8%.? [J a. 364.9 k] l a U gusset 3HLtfi}+'§-UL+ $14th [3. 12016 ltJ : +. l.-.. None of these choices is correct. AH 1‘: ‘ it? 7 13‘} I“ Kg: .t. 3. Walt-It gW‘Jt We “(J/wish £ch {5) (rs raw water traIJJ—eh/‘H‘tBHLDHJ wet “In. 45H: 9%.? + (—TItJ) a3- : is; k)” ...
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