Chem103F08T2 - ChemlO3 Fall 2008 Exam 2A Name iéi Section...

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Unformatted text preview: ChemlO3 Fall 2008 Exam 2A October 30, 2008 ,/ . Name iéi Section For Full Credit on Problems, SHOW WORK 1(15‘pts) Place the correct artsy? in the s ace at the left. / a ' . . A W L/iw‘yéi? a: / XW I. The reactantiir an eq ration that determines the amount of product that can be formed is called the ? 8&c417’0/13UE 2. A reactant that dissociates in solution is known as an ‘? graft; ofimt. 3. The gain of electrons by a species is called? €61"! Z 4. What is the formula of the salt formed from the neutralization of hydroiodic acid and calcium hydroxide? 50/ 5. The part of the solution that is present in the lesser amount is called the wagé’r (/40) 6. In an aqueous solution, the solvent is .50 // if 7. :Qroducts that will cause a double displacement (metathesis) to occur are . , NJ Mb 5 5.1 ant ,and #0 ’ 99” “mark 6&erqu cum I y ' / . 4g; ”a“ €§£1afibl 10. A chemical equation that involves only those reactants and products that actually take part in the reaction is called. % [4.75% 11. The phenomenon where water molecules surround a cation or anion or molecule in solution is called? . 5319/49 éé 12. A compound that completely dissolves in water in said to be /‘”5’/a £6 13. When two aqueous solutions are mixed, the product of the reaction precipitates -——“"'——““ out of solution. That compound 18 sald to be . 1n water. f/fidéd7ér 14. In a titration, the chemical that changes color to indicate the end point of the titration is called the g u I‘ 1/ a 6”“ 15. In an acid/base titration, when equal moles of acid and base have been added, it is called the point. I a * Mu Mafia-MM- 1 // U Name ChemlO3 Fall 2008 Exam 2A October 30, 2008 Section H04 points) Put the letter of the correct answer in the space at the left a ' 3> 2 1. Which of the following in NOT a strong electrolyte? A. LlOH D. NaC2H302 B. CaClg E. HN03 C M H %9 t . How many of the following compounds are soluble in water? Cu(OH)2 LiN03 NH4Br K28 A. 0 B. 1 C. 2 D. 3 E. 4 . Which of the following pairs of aqueous solutions will react when mixed? A. NHqNOg + LigCOg B. I‘Ig2(N03)2 + Lil C. NaCl -l- Li3P04 D. AgC2H302 + CU(NO3)2 E. None of the above will react . Which of the following is TRUE? A. A weak acid solution consists of mostly non ionized acid molecules B. The term “strong electrolyte” means that the substance is extremely reactive C. A strong acid solution consists of only partially ionized acid molecules D. The term “weak electrolyte” means that the substance is inert E. A molecular compound that does not ionize in solution is considered a strong electrolyte . What is the oxidation state ofP in fire? ? A. 0 B. +2 (1+3 D. +4 E. +6 (+1)+(P3+3(—2)n -2. P: +5 . Molarity is defined as: moles of solute per 1 liter of solvent moles of solute per 1 kg of solvent moles of solute per 100 gram solution moles of solute per 1 liter of solution moles of solute per 1 mole of solution econ? ChemlO3 Fall 2008 Exam 2A October 30, 2008 Name Kg? Section C2 7. 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 8. Molality 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 B. moles of solute per 1 mole of solution : , ) 9. Salts are composed of: A. a metal cation and a metal anion B. a nonmetal cation and a metal anion C. a nonmetal cation and a nonmetal anion . D. a metal cation and a nonmetal anion A” 10. With which of the following cations will bromide ion form a solid? A. Ca+2 B. Zn +2 C. Co+3 D. Fe *3 . B. Pb *2 C 11. In a reaction between KOH (aq) and HN03 (aq), what are the spectator ions?- A. :6“ and 1-1+ B. if and err C. 16 and 1on3 a D. 11+ and N05 E. oai and N03- C 12. Which of the following is soluble in water? A. Fe3(PO4)2 B. Fe(OH)2 C. Fe(N03)2 D. FeC03 E. FeS A: 13. A strong electrolyte is one that completely in solution. A. reacts B. dissolves C. decomposes D. disappears E. ionizes 3 ChemlO3 Fall 2008 Exam 2A October 30, 2008 Section A 14. 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 /, .5 ma! ,4; B. 20.0 mL of0.0500Mnitric acid /. 0 mmer M I C. 25.0 mL of0.0200 M sulfuric acid /. 0 M I“ D. 15.0 mL of 0.0500 M hydrobromic acie 0. 15"va E. 10.0 mL of 0.0500 M perchlorio acid (7.52) man? A” SHOW WORK FOR FULL CREDIT ON PROBLEMS 111(6 pts) 87.56 g of NO was reacted with 31. grams, of ammonia that can be produced? N 314.01 0 = 16.00 H S 1.0 33 g of H2 gas. What is the maximum amount, in 1 NOJJO-Ol ”3"2'02 mg:/?-0?‘ 2 NO(g) + 5 Mg) '9 2 NHa(g) + 211200) . , mnwvo 2W 1204 3 WM: N0= 57511 32.9ng Jr'w 49' ”Hf 241in = 7.29’5’mv/Jz. , ’u/ ' ZWJ’UD 11’ r Ans. 4?: g2 g1 1V(6 pts) A metal oxide X02 reacts With car 86.5 g of X0; completely reacts to form 60. xoz(s) +2C(s.) 9 Ms) + 200(g) 377M303 {if} 3.2.x?! m»: Java/fad 13011 to produce free metal and carbon monoxide. 8 grams of CO. What element is X? (’0 anew C'O ,7./9/m4C0 / x02. ; ,Jach—cmorxol ‘ . 260 ChernlOB Fall 2008 Exam 2A October 30, 2008 Name /@ Section f reactions. V(6 pts) Potassium perchlorate can be prepared by the following seque e - '%a on aa’ Swab? 12 ( (3mg) + 2 nor-1m) —> KCl(aq) + KClO(aq) + E1200) (,2 d2 #24 Kw a (W4 , gram-1245 4 ( 3KC10(aq) ~> 2KCl(aq) ~i- KC103(aq) IZWU -=,- ‘9ch ,4 1.; W53? 4KC103(aq) -> 3KClO4(aq) + KCl(aq) 4W0; -r was! fix/C? mdzbztfxm 4,3! Ha I- 3 #6104 action sequence produced 195 kg KClO4, 479 kg of C12 was reacted with excess KOH. The re what was the % yield for this reaction sequence? KClOg= 122.6; KClOg= 138.6 VI(6 pts) A 0.105 g sample of a compound containing only carbon, hydrogen and oxygen was \ burned in air produced 0.257 g C02 and 0.0350 g 1120. What is the empirical formula of the compound? C=12.01 0:16.00 H:l.008 flb (x AA, 02 4 0; .5. xc‘oz + g/JLD ’ “"fWC/Mf’flrw’refi .«éMfir‘mv/Jj flolfi'f' = Z. .507 Muff : a. 25%”: 2M“. : §,é§ffs/MJC .. 66/f3¢mwa/.oalf3V'/'W - KMJCIerof/J’ Huh/O. :qu —(,ooyEv-/x12.w) - mascara/fl?) MS‘M :. § 030 736,540 ChemlO3 Fall 2008 Exam 2A October 30, 2008 Name 547 Section VII(4 pts) What is the concentration of nitrate ions in 500 mL of 0.125 M magnesium nitrate? ”75 (M3); :. Wight—”516.4% )e/o'i’mb Ans. 0 ‘25? H M6 VIII(4 pts) How many mL of a 0.266 M solution of lithium nitrate and required to make 150.0 mL of a 0.075 M solution? VI M1 2' UL ”'2. V; (&:1LQ‘}C’J3-0)(b-o 2514) U! 3 (1/2: 2732- IX(6 pts) What volume of 0.244 M KCl solution is required to react exactly with 50.0 mL of 0.210 M Pb(N03)2 solution? ,Z_K.Cl(aq)+ Ph(N03)2(aq) -> PbC12(s)+ moxie3 [I0 ”a? 74/ bit/nine] 0/3 W' 0:91.0(5, 2-H M PMM'JZ) J /0..5rmmvj 11950145)? 0: 2.44 H 575qu X(4 pts) Write NET IONIC EQUATIONS for each of the following reactions: A. potassium sulfide + ferrous nitrate —» K’UOJ“ Fe .5 (s) fa“? 5‘2 _.., FE :m B. sulfuric acid and sodium hydroxide ~=> IVA-23501;. *Z/JbO + .- 14 w/J —> g; 04!)— JA/ r gar ~=> 24pm) 2g ' 6 .— 2 m4: r’mL Jlemmw’ Ans. yéaJ/MZ W 0.63845“; fl Chern103 Fall 2008 Exam 2A October 30, 2008 Name %7 Section XI(8 pts) Balance the following i'edox reaction in acid: 211+2(E1q) + NH4+(aq) 9 Zn(s) + N03 ” (aq) 4(Za’242e a5cfl@ ’- N%g%%0—»N%lwm# 5%? ’-/ 2732+ ‘ "9 45L- 4 45¢ 5214133140 + 45c 4- mg} my A. (4)The complete balanced reaction is: 453144142340 ~9- M 4 Mg '4 m!" B. (2)The oxidation half reaction is: Amman Hi. JR»)! } — J- _ W [4499* "'7 4423’ 0K ”44: 1‘” dog’flfl kid/J aa‘f C. (1)The oxidizing agent is: a 2. i D. (l)The total number of electrons exchanged in the balanced reaction is: 8’ XII(8 pts) An aqueous solution of ethylene glycol is 20.00% density of 1.04 g/mL. ethylene glycol = 92.11 glinol . mfitfi- A. (4)What is the inolai'ity of ethylene glycol in the solution? N " ’ffiifi/ 0-w=wfiLZU-W-. #- by mass ethylene glycol and has a Alfl'w 5% ,.- IW‘J Haw 543L- I? L : 74.xg’3mb 0%; 2'25 7: 114‘! M4} ”7;.” Ans. Z. 2&7 7: 0" M B. (4)What is the molality of ethylene glycol in the solution? 20, m M2.” = 0, 2/ films! 20-01719; ZZAW 6L“ ‘1- 2—12 : . (—le _. . Jo W'D%HO O‘OB'DMS Ans. .22: ;/%m (fin ’52:} My Chem103 Fall 2008 Exam 2A October 30, 2008 Name 7&7 - Section XIII(4 pts) A lead contaminated solution contains 0.0011% Pb by mass. The density of the solution is 1.0 ghnL. . _ F M _= m #25 A. What 1s the concentration of the Pb in ppm? F A 5 &000//7dfl3 0:00//2p$ 13W; /-/M}/é /r/M[fl/‘// firm/15%“ ? amatfitg‘ ”M X1V(6 pts) A 20.0 mL sample of an unknown l-I3P04 solution was titrated with 0.100 M NaOI—I. The equivalence point is reached when 18.45 mL of NaOH solution is added. What is the concentration of the unknown phosphoric acid solution? 4/; Pay 4 J/Vam a Nadflqf + 3&0 )n «PA/4W ‘{”'”’W57) (mam) =- fl: 00/?4/5’"w/MW 'eoo/Wfinn/MmJ //J Pa 31"}: W : 4, Am x/a‘ m ##4be -4 a, 0305/ M 6. my x/o m4 2. . 30 Ans. XV(5 pts Using the Activity Series provided, determine the products (if any) of the following reactions. 42. B. Zn+2+Co 9 418 0. Ag + if a A) D. Cu"' + Cd 9 “+ch E. Pb + H" -> be”’+— (J: XVI(6 pts) Give the best names for: Che1n103 Fa112008 Exam 2A October 30, 2008 Name Kai/f Section ma— 0 —- T [vary/9% Mew Qfiw 3(5) ”67% 6‘ "Ian/£61? 6’, r” XVII(6 pts) Draw stmctures for the following: A. 2,2 w diehloro __ 4 — t — butyl — 3 — hexene 0ng c9 ’34; d f ”M3 I NC "F "WC -—0£;C/J3 (11 B. m—nitro—phenol O/J I /""- 10{ \/ N0; XVIH(6 pts) Draw three positional isomers for the compound propane — diol. 0/1 (04 cm I I l {/gC, - (21‘ Gel—0H {/56 ”OJ—- CA: 1le a» mJ I I MIC 02L C/JL 34,6 )6 O] m 9 C11e111103 Fall 2008 Exam 2A October 30, 2008 Name 1)? Section XIX(10 pts) Use the bank of stmctm‘es to answer the questions below NH2 0 O CHs—m fl__ H 6 Emil/BMW A. CHClg B. C. V D. CF2C12 E, V O CHEW” CHE—"”0"” Hflulclwn F. CHQClz a, cot; H. 1' CH3 L o ‘ "A‘N. “\‘s'r. /"~'«.\., .15? . Ez/JEV’I‘K?J] “Kw J H __.(llw__ 0 W H J - K- L- M. . CH3C1 OH O t” T” T“ l ' NH——- O WNH CHE—— CH —— CH2 LWJI z 2 M Place the letter of the correct structure or formula in the space at the left. f _l.. A fused benzene ring structure a 6. aniline _—- £ 2. chloroform Z" 7. benzoic acid 2g 3. toluene D 8. freon A! 4. glycerine L 9. an alcohol L 5. formic acid 7 L 10. urea 10 Che1n103 Fall 2008 Exam 2A October 30 2008 Name 7%? Section Extla C1 ed1t(4 pts) What would happen to the concentration of 1.0 M NaCl in a 1.0 L flask if the flask 13 left open on the bench top? Why? Com/v; 7/!475m Magi mar/MP #0 would ev am. #57»! '£ {Mac} (xi-gum 5711-7 0071.5th Page 9 /J/ PagelO / 57 *C Page 11 {i Total SCORE 130 11 ...
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