exam5key2010sp0001

exam5key2010sp0001 - Chem 10 WF 7:45 — 10 am Sec...

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Unformatted text preview: Chem 10 WF 7:45 — 10 am Sec 1315/1316 N... Ker 4 June 2010 G. Strathearn Spring 2010 EXAM 5 ... Instructions: 1. 2. 3. A. A 1. The proper name for CH3CH2CH2CH2 CH2CH2CH2CH313’ *7 [42. 33. b. There are 100 points in this exam, with six (6) exam pages and 16 questions, including the extra credit problem. Check to make sure you have all the pages. You also have two pages of scratch paper, tables and charts, which you may remove. . > Put your name or initials on each sheet. Make it readable! For each question below, provide an answer. a. For multiple choice questions, place the correct letter in the space to the left of the question. If you feel more than one answer is correct, put the best answer. The letter must be clear. b. For all others provide an answer in the space provided. If your answer can't be easily read, it won't be graded - and gets no points! No cheating. You may have only a dictionary, writing instruments, an eraser and your own calculator. No other help or talking. You have 60 minutes. When you finish the exam, you may leave or stay for the review session afier break. Please come to the front of the room with any questions. 14' Multiple Choice Questions (10 at 5 points each or 50 points total). b. Propane c. Butane d. Pentane e. Decane Which of the following stresses will increase the number of moles of methane in the following endothermic equilibrium system? ‘ CO (g) + 3 H2 (g) ‘3 CH4 (g) + H20 (g) (balanced) a. add a catalyst b. add water vapor @ increase the pressure by decreasing the volume d. decrease the temperature e. decrease the concentration of carbon monoxide gas (CO) Which substance is the reducing agent in the following reaction: 0 -I '1 0 Brz (l) + 21-01(1) “9 ZBrTaq) + 1201(1) a. Brz c. Br" d. 12 e. The catalyst is the reducing agent. What volume does 1.15 x 1023 hex—2-en-1-ol molecules have if the density of ethanol is 0.880 -2 g/mL? o m: Hh‘lf 7 C‘Jh" flo-CGCCCCJI‘ ff e. 13100mL it WM” fio' #— ,70‘ ’ fli/ MOI (/.I§><Io"7(.£i"f—L a, / ’” L a. 16.8mL b. 21.7mL c. 101 mL (1 13lmL (mo? 1/ P 5. The correct ending for a hydrocarbon with a triple bond is a.—ane b. —ene 0. —one e. —ate A 6. For the following exothermic reaction, increasing the temperature will cause: 200 (g) + 02 (g) S 2002 (g) + heml' Q Increase the moles of reactant b. Increase the moles of product 0. Has no effect d. Increase the moles of reactant and product e. Causes an explosion I? In the following reaCtion, which is oxidized? 0H4 0~ Hab «rI-—L C6H1206 + 602 —'> 6 C02 + 6 H20 a. C in cal—11206 02 C. H in C5H1206 O C5H1206 e. H in H2C 2 +l +3 4 8. What is the oxidation number of a chlorine atom in NaClOz? . H +} r” 3 ° a. -1 b. 0 c. +1 (1. +3 e. +5 f. +7 0 9. What is the oxidation number of an oxygen atom in 03 (ozone)? a.-2 b.-1 d.+1 e.+2 C10. If [Pb+2] = 0.010 M and [Br'] = 0.020 M, what is Ksp for the chemical equilibrium PbBr2(s) <3 13b+2 (aq) and 2 Br' (aq) a. 1.0x10'6 b. 2.0x10‘4 @ d. 2.0 e. 0.5 2 [<7 :. (.0[0)(.02.6) :2. Short answer. Provide an answer to each question below. Work Required for Credit (50 points total) I, 11. A solution was prepared by dissolving 2.65 g cyanic acid (HCNO) in enough water to make 50.0 mL of solution Ka for anic acid is 4.76 X 10'5. What is the pH at equilibrium? (1 1 points) / é 423/7 .‘ . 73’ # Macab) :L ) 7" f/zri" /. UM Zr gym", /‘: Li'X v K K K: fh‘" CNOZ] ' #600] , X/O ': (XXX) , pH at equrllbrlum = Alma /.L3>7x, [5171’ MA 227 - l/vflK/O';= Xfla} {y flp’éx‘ ’/o (7766 x10"? 7. X T. ' : l 12. Balance then write the equilibrium-constant expressions K = ) for the following equilibriums (9 pts, 3 points each). ‘ ' ' a- CO (2%) “1H2 (g) <3 CH3OH (g) b. NH4Cl(s) <2 NHs<g> + chg) :— [ll/#IJChLCfl c. 2. Cr (5) +3C12 (g) <?’ZCTC13 (8’) K 13) Balance the following reactions using the half—reaction method. Show all steps. (10 pts) (11307-2 (aq) ‘l' C12 (g) C) (s) + C104-1 (301) Note: This will take about 10 minutes plus. Make sure you leave enough time for other problems! '1 001074” fi CY‘ (Ml); Clz—a £)Oa_/ ”, CVz07’Lr—9 2 CV(0H')] 2 “0’7, 6407'??? (,2 Cr(0H)37"/740 C]; + W10 ~—9 26/07 '1 We ZCrl0/791H7L20 cl; Who a2 doc/'7“ M7“ 03,0; trFHpc’a 2 CrlthJ +2720 all + gHwoa zc/afi/M’Mé . . , , H Cr; og‘kuLth/{a 12? Cr 0H), who 5.0/1m9/7twa/2 cm, 7L :l/fe I L ’5 3’7! _ I I ' H 030; 1% 6/2, +/1//*2%#40 ~2 ZYO (062,792 do, ¢W;W ¥CVL0;'L'I’;CIL+ XILF’f’ /7’7’7lLO "l Hwy/0692140 6/04” 14) Draw the following compounds (9 points, 3 points each). a. 3,4 — dichloro —2 methyl — 1 -y¢ntene & #9” $‘ f’ '3‘ H’CL-C” C,“ C” 94+ 1!]? « 17L H I b. l— hegahol hL l+ hL hL . , zero—e» c,—-.C, #0 gr # a h‘ a # c. a ketone group D II ' — 0 fi c'c’ e ” fr 15) Name and describe the four main types of bio—molecules. Then give the primary uses for each in an animal. (11 points) (D [71/1 (fair) ’ (8/407/ fist/Wye} c€// mmémwf @ (ArboA/aamfa [fiyarfl’emlyj @ Pl/OfQMI ~ enameJ {Ca+a////9)/ JMC/{ufl/ @ A/uc/efc/‘I’CEDQ ’. "3ch Nam/a 16. Extra Credit (7 points) A given chemical reaction has Kb @ 25°C = 2.34 x 10'6 and Kb @ 75°C = 7.89 X'10'7. Discuss what this information indicates about the chemical equilibrium. ® Keacfanfi flimme 21* 502% 7%fl/70€//‘fl #61 @ Incr{n//}7;~ #hVeVa/ékg fluor/ mac/79,77} [kzfl mean/n VéflCflOh [Ar/99 73) A”)? MéflH/n/ / /% [J {XQ7%(VM/Z. ...
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This note was uploaded on 02/01/2011 for the course CHEM 10 taught by Professor Staff during the Spring '08 term at Santa Monica.

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exam5key2010sp0001 - Chem 10 WF 7:45 — 10 am Sec...

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