Chem101_242_Quiz2_Ke - You may write on this test but only the Scantron Form will be scored Answer the questions on your Scantron form Each

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Unformatted text preview: You may write on this test, but only the Scantron Form will be scored! Answer the questions on your Scantron form. Each question is worth 2 points. Maximum Score: 40 points 1) According to the following balanced reaction, how many moles of K0 are required to exactly react with 5.44 moles of H20? 4 KO(s) + 2 H2O(l) —> 4 KOH(s) + 02(9) . s 2.; .m x 17.0% “ W A) 8.33 moles H320 2' _ [1/ ._ ‘1 if“ ° h B) 4.87 moles H‘20V _’ $3] 23‘ LAX W19?" “m” M n . y W ‘ i C) 16.7 moles H2O ‘ ' Waw gr)": :3 1 D) 2.72 moles H201... ' i “" a“ ' E) 10.9 moles H20 2 é” 2 e 1‘ 2) How many grams of Li3N can be formed from 1.75 moles of Li? Assume an excess of nitrogen. 0 Li(s) + N2(g) a 2 Li3N(s) g) 18.3 9 UN @203 g Li3N M45 2m \ C) 58.3 9 UN M 3 D) 15.1 g Li3N E) 61.0 g Li3N 3) Determine the limiting reactant (LR) and the mass (in g) of nitrogen that can be formed from 50.0 g N204 and 45.0 g N2H4. Some possibly useful molar masses are as LA follows: N204 = 92.02 g/mol, N2H4 = 32.05 g/mol moksltwm: ! i, 112040) + 2 1121140) 4 3 N20) + 4 H2003) I W X 3m“ “A. W; q s (6‘20?) $10005sz imm 310/1011 {11 \\ A) LR = N2H4, 13.3 9 N2 formed B) LR: N2H4, 590g N2 formed ‘ 453 gym—4 )2 ,0 LR: N204,1059 N2 formed “U ‘ “1 ‘ " " 53 4 '~ chwtm {'D LR = N204, 45.7 g N2 formed h mg; N ,7.) 15 W Z Z )No LR, 45.0 g N2 formed “ 3; .351; )1 01%, .1!— a . to. m ‘L 4) Determine the percent yield of a reaction that produces 28.65 g of Fe when 50.00 g of Fe2O3 react with excess Al according to the following reaction.""’’°‘""““’.d 399% a F8203(s) + 24‘Alrs) ——> Al203(s) 1: 2 Few w \ ,7 W; :1 LTMCA, :1 1.53.2 4‘ ' * “€80 » ’3: I )3 wk“ 3 It 1 ‘ " _ ‘1 \ 1-H" "a " . A)—2KO 02 537K3 "MEG )1 ct i “ “thawe’hm if?» x . O ‘ g \ g ' 0 w—Wm'wmm- Ewe»- 1. r r. i ,1“- -«~ — .2 B) 2865 /0 {:4 Kmart" F6133). 1" Z whiff Xx. 3355,911ng m gm C) 61.03 % 1.5 flak/~31 f Xflflflflb "Mm;,__a i wamfl)” 7” A) :1 ~ .1 43A 2 /0 ‘ gigs (,1 :1; \mhA l j/ T2... E) 51 .93 % t. - i s 1 \ 11W.“m.-.mw..... 9mm“? - '51:” (“‘1 h J , N '7 a j fl a: 7; i «A :3. - _ ~ \ " r“ 5) How many liters of a 0.0550 M KCl solution contain 0.163 moles of KCI? A) 1.12L y B) 3.37 L I: c x 1: ma: a: W j; r= C) 8.97 L N"): PM “W “"‘Nfi can... ,3” m... (Q)1.48L *2 93.,“ l <‘E‘)‘32.96 L ’\__.J 6) Determine the concentration of a solution prepared by diluting 25.0 mL of a stock 0.188 M Ca(N03)2 solution to 150.0 mL. 7) Which of the following pairs of aqueous solutions will react when mixed? A) A9C2H302 + Cu(NOs)2 —~7’ As N05 w») + E; u C13030:. W») :=>'\3‘P\~ + 1H9: ng(N03)2 +1'Lil ————->ZL‘\ N03, (My ) (9) R C) NaCI + Li3PO4 fa Na Vo‘mufi L“? C\ CR“) RVeL\?‘\'\’C«‘\'\O(\ D) NH4N03 + -———5 L} N03Lqm} + ago-D anbj E) None of the above solution pairs will produce a reaction. 8) Give the complete ionic equation for the reaction (if any) that occurs when aqueous solutions of lithium sulfide and copper (ll) nitrate are mixed. N. 137, S >r Cm {N05)L /'—"“’l ‘lMNCagm‘lj’ LM§ (5) £230 + Cuzigaq) + 2 NOE—(act) —’ CUSlS) + Li+(aq) + 2_ NO3—(3Cl) (aq) + CU (aq) + N03 (aq) H cuss) + U (aq) + N03 (aq) Ll+(aq) + Ska ) + CU+(a + NO3(aq) —> CUS(5) + LlNO3(aq) 2 Li+<aq) + S laq) + CU +(an) + 2 NOa—(aq) —’ CUZ+<aq> + SZ'laq) + 2 LlN03<s> No reaction occurs. ,«q a; <92 Li+<aq> + 32- C) D) E) 9) Give the net ionic equation for the reactio solutions of K28 and Fe(NO3)2 are mixed. (/fimxx 2+ 2‘ I.Mez+(aq) + 82_(aq) 4* Fe+S(s) ~ 2+ I B) F8290 + 32_(aq) + 2 K+laq> + 2 NOBlaQ) —’ Fe (aq) + S"<+aq) + 2 KNO§rs> F? (aq) + 8 _(a0) + 2 K (aq) + 2 N03 (a0) —’ F980) + 2 K (aq) + 2 N03 (80) K (aq) + N03 (aq) H KN03<si No reaction occurs. ’3‘ (if any) that occurs when aqueous I, - _ .. .t “”“"‘"*“""3 l5»? :3 . , + FableJL . c a ‘. C44" E C) D) E) A 00313 M . . , 1—: ‘ W- 831.13M MW \ W M " L \. €154. W I“ . #2 CM“) (3) 00199 M x M 25cm in...) .3 . L: my; ,' \ D) 00501 M M1 ” ‘* WTI—a—W—M—l—ewm ,V._......-,_,._s E) 0.0887 M 050 no 4-" W cm .r/ ,1 1 which of the follo 10) Identify the spectator ions in the following molecular equation. vi ‘ 7 KBHaq) + A9N03<am —’ AgBrtsl + KNO3<aq> _ I *" ~ ’ ' °\‘ A) Ag+ & N03” - , < , BalAg+ & Br‘ 5%? I fl f“ {‘C)‘ * & N03" 2 ) K+ & Br’ E) There are no spectator ions in this reaction. x/flg “A” Mng is an acid base reaction? @2 HCIO4(aq) + Ca(OH)2(aq) a 2 H200) + Ca(C|O4)2(aq) B) I:ersl + 2 A9N03(aQ) a 2 A9<s> + F€(N03)2(aq) MQSO4(aq) + BatN03)2<aq> —’ M9(N03)2<aq> + BaSO4<s> C(s) + 02(9) *9 002(9) None of the above are acid base reactions. .r—‘w C) D) E) fi) Which of the following is a re ipitation reaction? ‘ A 2 L”(aQ) + H92(N03)2(aq) H) H92'2(s>)+ 2 LiNO3(aq) - pow: 3) znts) + 2 AQNO3(aq) fl 2 A (s) + n(N03)2(aQ) ./—) NO)\(\oNe to bAWtfl' “of g“ flew o) HCl(aq) + KOHQQ) —» Kcraq, + H20“) sou/men w/ no so“ é , E) None of the above are precipitation reactions. 13) Which of the following is classified as a gas—evolution reaction? A) 2 CzHem + 7 02(9) *t 4 C302(9) + 6 H20(g) ’3’ CO mwymm { vedgx) LiCl(aq) + NaN03(aq) —» LiNo3(aq + NaChaq) Nb / NH4C|<aq) + KOH<aq) —~> KCI(aq) +KNH3(g§ + H20“) {:79 )2 H2<g) + 02(9) a 2 H20<g) -) redox E) None of the above are gas—evolution reactions. 14) Which of the following is an oxidation—reduction reaction? Pb(C2H30g)2(aq) + 2 NaCl(aq) —~> PbCI2(5) + 2 NaC2H302(aq) i 8)) Mg(s) + 2 HC|(aq) -> MgCl2(aq) + H2(g) (“Q0 we“? Trim: 1* ’ \5) Na'taq) + A9N03(aq) —’ A9'(s) + NaNO3laq) V 5 D) HCI(aq) + LlOH(aq) —> LlC|(aq) + H20“) E) All of the above are oxidation—reduction reactions. 15) What reagent is the oxidizing agent in the following reaction? CH4(9) + 2 02(9) _’ 002(9) + 2 H2O(9) 2 CH4 .‘B 02 ‘ ) co2 D) both A) and B) E) Neither, this is not a redox reaction. DJ 16) Predict the product(s) of the following reaction: Aqueous ammonium chloride and aqueous lead(|l)nitrate fig! V I g t; i ,1 ,, 5.: “44% I A) PbC'm 29W“. \ ’ ; wig, \‘c‘kykal A] B) NH4NOgraq) o) PbCIZW ' D) both a) and b) E) both b) and C) 17) What is the Arrhenius definition of an acid? A) An OH’ donor B)A proton acceptor substance that produces H+ ions in solution D) A nonconductive substance E) None of the above 18) If 3.5 L of a 4.8 M SrClz solution is diluted to 45 L, what is the molarity of the diluted solution? :B) 43323 MNFM'N’L .~ ’ Lf‘i Fm“ ’ C) 0.0162l\/l M1: MM 9. {CA-(OM) K 3 f: \O D) 1.1 M ’7’ / E) None of the above \17, L" 19) A strong electrolyte A when fully dissolved, does not fully dissociate into separate ions if B when fully dissolved, fully dissociates into separate ions :C conducts electricity MD) Both A) and C) are correct a EEBoth B) and C) are correct 20) A dilute solution A) contains a large amount of solute relative to solvent A A . ilB);contains a small amound of solute relative to solvent C) is a heterogeneous mixture D) Both A) and C) are correct E) None of the above ...
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This note was uploaded on 06/25/2008 for the course CHEM 1A taught by Professor Nitsche during the Spring '08 term at University of California, Berkeley.

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Chem101_242_Quiz2_Ke - You may write on this test but only the Scantron Form will be scored Answer the questions on your Scantron form Each

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