C111PF07T2 - L m) .3 2th."- ml‘gm _ '1 If .i....

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Unformatted text preview: L m) .3 2th."- ml‘gm _ '1 If .i. .i‘_\ QT? "'3‘ “it” \5 “i ' \ CHEMISTRY-"112 SECOND EXAM OCTOBER 26, 2007 m GOOD LUCK m * ' 2 ' (A) ( 0) :13 - - *" TILE J l. Considerth ree species below. Which isfare linear? f \1 [o -'\ 7 Y E . 9' Ilia-"'1' A. co) {123 c_ 0122 5;.- ; x ‘\ I \ SH * _‘.. ‘ (1) A only... (2) B only (3) C only (4) A & C (5) all three are linear '3 ’ ‘ '3 ’ ‘95; 2. ' What is thesteric number of the cenpgl atom in compound C from the problem above? l 1. 1 (I) I (2) 2 (3) 3 t4) '4) (5) 8 LS)? can . .e . ;_. . . " fig; ' I'1 .U' 3.‘ What is the oxidation number. of the oxygen in compound C from the two pfoblems above? _ i I I _ I (l) —2 (2) —l “\(3) n5 (4) +1 (5) zero g l 2 ‘ " ' Ci ‘3 D e in e o . " 4.; What is the proper system/iglhame for the compound C from the problems above? a 14 v -'-- O _. . " 2+- '- / (1) oxygen fluoride (\(Zyoxygen difluoride (3) difluorine oxide (4) oxygen difluorine (5) difluorine oxygen "— 5. Whi’? of the following polyatomic ions docs not contain oxygen? '« __ - ' . _') . ~~ -' , _ . .((.I . \ _‘\ . sulfite B. phosphate .5 \. ammonium N _ cyanide ( l) A only (2) C only (3) D only" ' & D (SI/all OftheSe contain oxygen 6. Which of the polyatomic ions from the blem above caries a —1 charge? (1) A Only (2) C only '(3) D only (4) C & D (5) none of these is —1 _ _ 7. _..Dinitrogen tetraoxide has the empirical formula _?__. :I.._ l“: . ‘4 (Q N204 (g) NO ( NO2 ' (4) N205 (5) none of these is correct ' 8. When the reaction below is balanccd with minimum integral (integer) coefficients, the sum of thosc ' coefficients is ___?__. CuFeSz(s)+ 02(g) -—> Cu(s) + A FeO(s) + _ 802(g) (l) 10 (2) l3 15 (4)1 17,. (5) 19 1. 9. _, e reaction balance in the question above is an example of a(an_) _'?_ reaction. ' l J' acid-base (\ dissolution precipitation @edox S) the reaction does not fall into any of’th'ese categories (‘3' “(Jami THE NEXT FIVE(5) QUESTIONS CONCEfgq THE BALANCED REACTION BELOW: MW’s 254.2 126.75 36.45 53.49 439.0 162.20 18.02 0504 + 4Fegl; + EHCl + 2NH4C1 ~—> (NI-I4)2(OSC15) + 4FeC13 + 4H20 £300 /— a it). 1'73; 102?). W U. / w . : -. L'u' / 10. If x moles of HCl are used with exccsses of the other reactants, how 111 y moles of (N H4)2(OSCI5) can theoretically be produced? {(1)3fo (2) x (3) KM (4) xi]? (5) 8x 1 I. If 200g 0150504, 250g of FeCl;, 120g of HCl and 100g ofNI-LC! are__allowod to react, what is the limiting reagent? (1) 0304 (2) FeCl2 (3) HCI Q) NlnCl < (5) none of these are limiting, the reactants are in perfect balance K a \ , _ 12. Based on the amounts of reactants used in the problem abotfiwhat is the theoretical yield OfFEClg? ("j (1) 1333 (2) 511g (3) 320g (4) 257% ...(_5)”50§g , , . .1' ,6; . I; I"); I I‘D-4 \ ' ‘._ - _, ' \\ —PAGE 2 — W, 13. If 250g of FeCl; is actually obtained in this reaction using the amount from above, what is the percent yeid "1'" -. of the reaction? (1) 100% (2) 48.9% (3) 78.1% (4) 93.6% ® 41.3% 14. If y moles of FeCl; is produced in this reaction, thenhow many moles of HCl must have reacted? ,2" (l) y (2) W ,9) W (4) 43' “1:55 2y 32MB“- ') L ‘- . . 15. How many grams of crhcmm nitrite must be used to prepare 150 mL of a 0.20 M solution of calclum nitrite? (1) 26.5 g (2) 4.94 g (3) 3.98 g (4) 3.06 g (5) 2.53 g \- 16 What is the molar concentration of nitrite ions in the calcium nitrite solution from the problem above? (1) 0.030 @060 (3) 0.10 (4) 0.20 ((5)) 0.40 1?. If the calcium nitiite solution from the two problems above is diluted to a volume of '50 mL, what is the fig“: concentration of calcium nitrite? ‘. . (I .040M (2) 0.033M (3) 0.2? M (4) 0.06? M (5) 0.080 M 18. What volume of hydrogen gas at STP would be liberated from the reaction of 450 mL of 0.50 M HCl solution with an excess of magnesium metal according to the reaction below? ' ‘ Mas) + 2116104)» Mgztaq) + 2crraq) + Hag) W- "’- (1) 0.225 L (2) 0.45 L 9:“ (3) 0.90 L .51L (5) 5.02 L a} I L“ .' q '1__ 19. /[n the reaction shown below, what is the oxidizing agent? .x’” 2HN03 + sags —: 2N0 + 35 + 41120 (9mm3 (2) ins (3.) NO “(4) s ( none of these, because this is not a redox reaction 20./1Which of the salts below is insoluble? _ , 39‘ " 0 I‘- - sodium nitrate lithium carbonate ammonium phosphate ' I calcium sulfate (5) none, all of these are soluble .. r (M900) 3,05 21. What is the anhydride of sulfuric acid? —-""J I 94.3,”? /' sulfate (2)_ sulfite hydrogen sulfate J‘s-(4)" sulfur dioxide @ sulfur trioxide I_ _ 22- (what is the conjugate base of Sulfuric acid? 3ij L1 - ((Djlsuh‘ljfatefl _ (2) spliite_____, 70(5):) hydrogen sulfate sulfur dioxide “(75.) sulfur trioxide __/. L, \J‘ _ II: I. T. -— 3. hat is the oxidation number of the nitrogean potassium nitrite? ZE N02 K U131 -' (l) —l (2) 0 (3) +1 (9,4,3) (5) +5 . . «‘jij. ! flank-«- r / all (_II J;' " I x _ ‘ _24 Which ofthe following is an electrolyte? A. potassrum nltrate B. acetic acid C. ammonia / / (l) A Only (2) B only (3) C only (4) A & B (5) all three are electrolytes it dissolves in water to produce a solution that conducts electricity Wich of the following statements about sodium chloride is incorrect? it dissolves in water to produce discrete, Separate sodium cations and chloride anions a _it dissolves in water to produce a heterogeneous solution 't is soluble in water iéayhe dissolution process is a physical change —r— PAGE 3 — _ 3:1 . r as» ‘ (2b WAN-03 4?: 26. In the precipitation reaction demonstrated in class using solutions of p'otaSsium iodide and lead(II) nitrate, . 9 - - f- ‘ . what were the spectator ions. V b [M _ . . 3.. (1) Pb” and 1C (2) H30' and r (3) K and Nor [C and No; (5) there were no spectator ions in the demonstration reaction ‘ I 27. A substance that can function as both an acid and a base is called a(an) _?_fi substance. *3). (1) dipolar (2) ambivalent ((3) amphoteric (4) ambidextrous (c MO ;-. (5) none of theser because nothing can nction as both and acid and a base .-. . .D (2 28. At 100°C and 1.0:) atm, the density ofa pure gaseous compound with the empirical formula CH is 1 '5 3 determined to be 2.55 g/L. The molecular formula ofthe compound is (1) CH . (2) C4H4 1": (3) (3sz I CEH‘El (5) more information is needed {5011 ms . a: SIM“ '9 [0 gave a firm r 29. To what new temperature must 300 L of He(g) at 255C and 1 atm be changed in order for its volume to be 11;. u' 1 reduced to 1.5 esame pressure? 1 k:er ' ,J. r (1) —258°C 96960K (3) 214K i4) 500°C (5) 288K 1.»; :41) ' LIT r " “'— ‘. ._-\ t- we," I l 30 A gaseous compound effused through a small hole at 3.09 times longer than the time of effusion ofgelium -‘ gas under the same conditio What is the molecular mass of that gasf’fij/T“ ' ‘3‘" _ 32.4 2 1.29 3) 38 4 6.17 .\- (if; \(3: @ without this dctual times 1nvolved, this)question can not be solved \i%\ ‘3‘)” :J " . 4‘; T 5- w ’- 2 :0 "—- - l "— ‘ <0 T : .0 org 0 -— , I Ll ‘-" it“sfiw 1-”3' I_ _ TURN IN YOUR SCANTRON SHEETS. KEEP YOUR EXAM PAPERS. _ iii Ll % x: :__ MN ltq 1,5950 {2/ 3 24“ ' he; i A KEY TO THE EXAMINATION WILL BE POSTED IMIVIEDIATELY AFTER THE EXAM. ( E) W (J : j . 555.3 a _ 1‘ VV’ l L) V" n. . ./”q"? (J’s V ~ rpm {53- Q' \j? :3 COIL}— (m 1\ 30* C °> - K ) (fit I ) ‘ F < f c A e r r . \; fl 'xj’a 6‘) q a. r ’ iv 17K); 1 r, I O l O ) d! 1 X1 Blue Exam J. 11.4 .I 13. aiaqu «.4 n...— _.)._ a; 11. :3. .1». .11. .3 w). .l Q. Q... _ 1 H .a. $4. 3.... 42 fl 1 «J 1». 4.4. :1. a) L13+i 1311.134 II ( aiqu 1431.4 1. 1 11._ 1.... i ...
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C111PF07T2 - L m) .3 2th."- ml‘gm _ '1 If .i....

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