{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Chap 5-6 - Key - EXAM HI CHAPTERS 5 di 6 SPRING 2010 —...

Info icon This preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 4
Image of page 5

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 6
Image of page 7

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: EXAM HI - CHAPTERS 5 di 6 SPRING 2010 — GENERAL CHEM R = 0.08206 atm . L/mol - K R = 8.314 Jlmal - |< 101.3 J/atm . L Multiple Choice 1. Which of The following gas samples would be most likely to behave ideally under The stated conditions? ® Ne at STP (b) (:0 at 200 atm and 25°C M same; i: upemlurc and game: , a 3M. (c) 502 atZaTm andO K 511M”; gdmnfi (d) N2 aT 1 atm and -70°C (e) 02 at 400 atm and 25“C Which of the following repreSents Boyles Law? :3 :$::: 903L115 Law '1 V 0‘» _i_ 9 v :K(lf.3) =7 PV=|< @Pv=k P @I’Ial/T PV :- flgr J— 9 , P, V. a“ “Hair (c) n/T = constant ' (d) PWT = R a = a. .77 w i , . ,. -. (e) The relationship is not shown fl ? ‘-- T” > : a :> “”5"”? I. :5: I; °4 h Which of The following will cause The volume of an ideal gas to triple in value? (a) Raising the temperature from 25°C to 75°C at constant pressure V: nil]: '- NO , Ml“ '0 (b) Lowering The absolute Temperature by a factor of 3 at constant pressure P -— N0 (c) Raising The absolute temperature by a factor of 3 while increasing The pressure by a factor of 3 _. “My“; (d) Lowering The absalute Temperature by a factor of 3 while increasing The pressure by a factor of 3 - 5a m e, @ Lowering the pressure by a factor of 3 while The Temperature stays constant If the number of moles of gas is doubled at constant Temperature and volume, The pressure of the gas: (a) Is halved Q Is doubled 9V: n QT Kt f" gm“! R ,T—n V is cunsIm-i— (c) Is qUfldelzd F- flEi‘ S / P afi l’L :7 P at 21-, 2. SLIP (d) Remains The same v One mole of which gas has The greatest density at 5TP?I @Ar (b) 02 0‘ gas : mm" This? 3137's", :— fi : 7 Larcfiasl ML" : gi’w'lffi'" ANT-+5 (C) N2 molar igniuft‘i‘i L fmojf L (‘3 Ne Three identical flasks contain Three different gases at 511’. Flask A contains CH4, flask 8 contains C02 and flask C contains N2. Which flask contains the largest number of molecules? 2:; East; ' I“ 91.? i all aflfi'fi htUE hm 551nm molar 'JO lume, as (C) FlnSkC - $9M” Wu!" ‘-’ Same rra‘scilrfi @ All flasks contain The same number of molecules PAGE 1 OF 9 EXAM III - CHAPTERS 5 6i 6 SPRING 2010 - GENERAL CHEM 8. Which assumptions of the Kinetic Molecular Theory of gases are else? (a) Collisions between molecules are perfectly elastic, with no change in the total kinetic energy of the gas molecules (to) No forces are exerted between molecules, except through collisions which are perfectly elastic l (c) A gas molecule has negligible size. Pressure is a conSequence of the force of collisions with the walls of a surface, Such as a container 1 (d) The kinetic energy per gas molecule is proportional to absolute temperature (9 None of the above 9. Which one of the following gases will have the lowest rate of effusion? ('3) 5F4 (9 SCI.‘ pal, (533.5“ s 30mg ‘r or 10 ”5+ 19“ «em 3 realest Hole-r LUST; (C) 5205 (d) 503 10. Which of the statements about real gases is true? l (a) The volume of the gas particles is zero ' F“ [5 ‘- (b) The mass of the gas particles is zero ' Fills; (c) Forces of attraction and repulsion exist between gas particles at close range - Tvuc (d) Real gases often do not behave like ideal gases at high pressure or low temperature ~Tm c. Q Two of the above statements are true 1 1 . Which of the following is M a type of energy transfer? (a) Chemical energy (1:) Heat Temperature (d) Work . with a movable piston at a constant atmospheric pressure of 1 atm? 252th (3) t 702 (9) —> 4602 (9) + 6H20 (9) 12. What is expected when the reaction shown below takes place in a thermally-insulated container outfitted II-E'ffM” {’91-- 'r'r‘”) 4t? Pr"}5-‘..LI’ if, (a) Volume will decrease and work will be done by the system :7 W 1 4 y > . 03) Volume will decrease and work will be done on the system ' ‘ 'J‘ ’b _ l” "I' =‘ jab @ Volume will increase and work will be done by the system 4", __ V t- (d) Volume will increase and work will be done on the system E spans-oh ( h. , g, j 13. Which of the following proceSSes is endothermic? (a) The freezing of water ‘ $01 ml "" “wit-l, Wll’ 5 Will “land (in) The combustion of propane incal rclcaml (c) A hot cupof coffee (System) cools on a counter-top coil’u Velma, pan- *0 utmost; in ,L (d) The chemical reaction in a "hot pack" often used to treat sore muscles releases heat lo Mqécles @ The vaporization of rubbing alcohol . 7 ll. -9 i must add M‘l' 14. Two metals of equal mass with different heat capacities are subjected to the same amount of heat. 7'— Which metal undergoes the smallest change in temperature? (a) The metal with the lower heat capacity (b) You need to know the initial temperature of the metals You need to know which metals you have The metal with the higher heat capacity The highr 11‘,- Ml, ”.1?“th .1»! More a Bath undergo the same change in temperature 1 PAGE 2 OF 9 hul- Hinl Cain be absorbed. EXAM III - CHAPTERS 5 d: 6 SPRING 2010 - GENERAL CHEM M . 15. At constant pressure, the following reaction occurs: CH4 (9) + 4ch (g) —> CCI4 (q) + «ma (9) AH...“ = - 434 kJ/mole I. The reaction is exothermic "ll ‘9 II. When 1.2 moles of CH4 (9) reacts, 5.2 x 105 J of energy is released — 3: S III. The surroundings are doing work on the system _ Noi- known IV. The enthalpy is equal to the heat .. {5‘5 ) a" ___ A H a Constant l9 (a) Statements I and II are true (b) Statement II is true ‘ '— (c) Statement I and IV are true ' d All of the statements are true g Statements I, II, and IV are true un- 3‘ '5.Q.Ainb Free Response — Be Sure to Show your Work! This includes all equations and conversions! 1. State and describe briefly Avogadro's, Boyles, Charles, and Daltons Laws. AVOEaAWS 10°)? Vof. I“ D ulslanl’ Tonal P. 'leun h'l I \I'l‘ fibflvs Lou: i V ol-L Z? Cane-+3.1: Tonal VLI "M‘Wt F4" V‘l’ "" P‘l’V‘l P C‘mi‘us Law 1 V ‘,L T D Ciii'ib‘l'li'i‘!" Pan-ML n '. w‘nm T 4- V1‘ M Tl Vi, milaiié Law '— PleM = r} i» PB 6— ?a The, total possum 05: :2 5459711 is crhml +n Hi. Su'i‘n of the partial prreurs 0i i ilrll -i (ll «liq-ll 3995 i 2. A balloon originally had a volume of 0.439 L at 440°C and a pressure of 729 torr. To what temperature must the balloon be cooled to reduce its volume to 378-mL if the pressure remained constant? Derive your equation uSed from the ideai gas law. What law is this? T l’ n I mslml l /. N: nil‘i' (omiiVXsmK) _._..——) ti v‘noifs glare. Nil \ . . i _ n R change, T T .‘l = cmstané' T V;— 12.4qu (‘V‘ a’is'ml. . U] - U; T; inc-c: 311K i W mm: M “f - T] 3"; mo P: ‘124 l‘rri’ :) carib‘l'iflll'll V - E” ‘ I i y’o'Vlal— ' Ta» ‘ :ZTl T= 1: Vt PAGE 3 or 9 EXAM III - CHAPTERS 5 6i 6 SPRING 2010 - GENERAL CHEM 3. Calculate the volume of oxygen gas required for the complete combustion of 14.9 L of butane (C4Hw) measwed at the same temperature and pressure. Write a balanced equation for this reaction. {M combat Ti— PJ Vgh (I llIa +0 —-—a- to .l . .2" ll 5!); 3/5)) Ll afij) +§l.;_0 {5“} \i' ij‘dms luau) l3]; Jean“, .L '20.: ——> 360., ; lo lilo n Iti‘ilyfi’fiim i“ ”J :lQodkl '” :11) 4"}: Mil ' ‘ ll) 4. A sample of ammonia gas is completely decomposed to nitrogen and hydrogen gases oVer heated iron wool. If .the total pressure is 866 mm Hg and the temperature remained constant, calculate the partial pressures of nitrogen and hydrogen gas. Write a balanced equation for this reaction. =71le / ) ———--9 Na. + 3H} = mam»! {akin-lion ‘6) ball" J1) ['15) W lhlic lemu Pl-l _' 1'“; (RT-0+al) — 1H} : Eli MUS H)- : BIWDUS :al‘l! 3‘ Total. Mull) (igN ill) ll mallé PM} " 1N9 (,PTOTH) 1N; : JJ we”; N} _ lmd r _________. , ,_ = '2 Telnl Maui. H was 0 = (0.75 )t 15me m3) = we; ; ll’SD'Mllil 5. The zinc within a copper-plated penny will dissalve in hydrochloric acid it the copper coating is filed down in several spots. The reaction between the acid and the zinc is as follows: 2"+ (as) + 2!! (S) —* Hz (9) + Zn” (0‘!) When the zinc in a certain penny dissolves, the total volume of gas collected over water at 25°C was 0.951 L at a total pressure of 748 mm Hg. What mass of hydrogen gas was collected? The vapor presswe of water at 25°C is 23.8 mm Hg 4 when as! rollnl (3m 0m" “‘0’ U52) Vapor 354.5 wafqt into Ha: figs _ Ni? Cam-cl Colic-cl Pal": l-l‘l (a) I il- “ 4 We hull 4'0 use (Lilian: Parliul fugue. rm! l0 'jtl Tl“ Fmsm" a? “A (6} b‘ll sell, 50 W “m plug l'llb :d‘wl (3’5 I” la 3"” FL" “He. "\ I n;(fl.n§9u4u/l(o-Qsl{) a Hit 3' 9. nub and“! ' pr-{AL : PM. +‘Jr “do '3?“ - 11.4 'a’l‘lfl’rl'1 1d ( O my)ll‘lig) ' ' l 7w. M3 ' P”? : “a?“ ‘ W‘s? Pris: a “155,;an on; 0. 03': 1 mice PH; 1 fillvnim Hg - 23,3mhl-lzf . l’H — . l‘v : mar ”j ”e“: a aafilwfl 9015":- o1 ' 124 Wiml-l'j . in? (I! V/ 3%.! PAGE4OF9 EXAM III - CHAPTERS 5 6: 6 SPRING 2010 - GENERAL CHEM 6. Calculate the root mean square velocity of helium molecules at 298K. VYM51‘lMM3E: ) MM W; = 3’l' 00 fi/Wlbl i but Neal'- Ll 003% ”(‘3 : 0.00:.{00 Moi implal K3 [moi we, =l5é::i raw/+0 (20352 ‘ 3 _ ’“D _'3 lc Mgr-Mei v) — ms 0 we?“ lflw 7. Consider separate 1.0—L gaSeous samples of Ne, N2, 61;, and H2 all at ._5T___P. (a) Rank the gases in order of increasing average kinetic energy? Give a brief explanation for your making. EHEMfi = 3/1 RT ‘, bind all gasp; are air 57?; all «cit 275 K; all have Santa. KEHJ' (b) Rank the gaSes in order of increasing average velocity. Give a brief explanation for your ranking. Vim ‘ efl -, AT same T MM } mica. velml—a Alpmdi on MN. The bummer +he Molecule, HM slower 'l-‘lmspceal. Cl; (”(0. 403/er ) 4 N) (9800.? alumni) L Ni. (.204ng 4 H.)— (201 Smut) (c) Describe how Separate samples of Na and H2 have the same average velocity. 9%“ N9 i5 [444th than ”a: ll will Woveslbwer. To gel "HM goes to riwve. a‘l.’ ‘HUZ Same 5“??ch time- T 'E’r NJ mus-l” bl. lHCT-PQScds )ar 'l‘hfi T you“ 112’ maslr be deucased. (d) If the number of each of the males of games is doubled. how will this affect the average kinetic energy and average velocity? DoublArifi l“- aggzcls P anal/slaw, Nol’ V—r—lmb or KEM‘j, No charge, W PAGE 5 OF 9 EXAM III - CHAPTERS 5 6i 6 SPRING 2010 - GENERAL CHEM 8. Calculate the change in energy when CO (9) is converfed 1'0 602 (g) a? I aim and 25°C. 260 (g) + 02 (g) —> 2C0; (9) AH = - 566.0 kJ/rnol Is this an expansion or compression of a gas? Wind is happening from ihe system's point of View in Terms of energy and enfhalpy? s . the,“ Au —'5Lyt..v¥3 [0003' : -5-(o£axt° 1' jn-ul (jag, #4- .1 “01 1:145 :. towards-ion moi “<5” "A: a b i b H E +MV b“. 7 M'FII'U‘L “WiHI'H'R-A 5E 7' A“ -J5PV / p“- * amol ‘ BM“ = ‘4 AE ., AH — Anfi‘r’ 9E : *5.bta0xlo§ .7”- (-J§(3.3Hrgmu1}<’)(2rix¥/) A}: = r 5-035XI067/mol f____ __,__..-_~_.___i Us “Ir/Mil N 51-! PAGE 6 OF 9 EXAM III - CHAPTERS 5 6i 6 SPRING 2010 — GENERAL CHEM 9. Zinc metal reac’rs with hydrochloric acid by 1he following reaction: Zn (5) + 2H6! (an) » ZnCiz (a4) + H2 (9) When 0.103 grams of Zn (5) is combined wiih enough HCI to make 50.0—mL of soiuflon in a caffeewcup calorimeter, all of The zinc reacts raising The Tempemfure of The Solution from 225°C to 237°C. Find AH”,1 per mole of zinc. The specific heat of water is 4.18 Mg “C. Is the reaction enda'rherrnic or- exol‘her‘mic? Wha'l' is happening from The system's paint of View? ’l‘ Mug rm, ‘Hk Ml ezuoiml Absorbed masts a limp. chm —, m 30M _‘ ”Tlnzrmwh'r Lb {hound b3 Harm-welt? ”+0 2 l' i‘l" 15m kw l‘l'd‘l' CaPaézlij a? soil-1 (“30) J W- (an wirululc 3‘50!“ l+ ll’gfllfl '5 Ml dbfifbfll/bbl gum Salk; =7 filial i‘S ac‘l'ié‘j an Sgir'tvwd! .‘ Lid Lid Two weal L’ 9W“ = “win xcs.u.§oln X 1” I'D w - ‘ . . . \ :ljrdlel‘sf * Sum-L The Insu‘alml Caiir=mrltr" Pféirml'l’ Ml 5M4 amp: . J l I Sci“, We can CI‘JSumL +l~¢ lwl gamed. hj 'l"lk win”: lwl 109i big pmho. - .J’ L‘ Q’W“ ; 'tlmal-k cmslunl' la {oil 4 I '. is- a «fusion nu 5i! Rm I; Wm? Wrblwfl‘f P, a qawn = %,P , bury“ 1/30“: msuln. X C's“ 59”.be Mul‘ flit—£211— .-. 5'0. a? lull. Subc (3T = TF '1} = (am—215°C.) = Misc CS“ ’1' Li-ifi’ T/anc Du. 1/ . tl5’~'-I 5b 03 l(ll'lil>(i,1'g) ___ 2.CKIOJT PAGE 7 OF 9 EXAM III - CHAPTERS 5 d: 6 SPRING 2010 - GENERAL CHEM 10. Use standard enthalpies of formation to calculate AW,” for: (ii-203 (s) + 360 (g) -' 2.Cr (s) + 3602 (g) m m cm» Bio-— ' Auorxw : Z l“; ll? Pmducl'fi ’ é VL ll'fofeflfil?“ l5 0 l'lfo ll?!” an cu'fi‘ilh‘h I}! its filanich-‘L’l— 5+9“; :0 L" CH5) =0 ' Mari?“ [(3 mama; X was U/mi fl , [( 1meLL’G‘53‘Y' nan-1.43335}; t GWWF‘W'Q‘FM) bll°r1n -. f— ”30.; K3] . L-lI-«l'llflllcjj =laqo.r1i:3'] 11. An exothermic reaction in a bomb calorimeter liberated 14.3 K! of heat. If the initial temperature of the calorimeter is 250°C, and the heat capacity of calorimeter is 1.78 x 104 37°C: (a) What is the final temperature of the calorimeter (b) What is AE (c) Prove that q = AE (d) What is happening from the system's point of view? . For it. Ban-p Qaiomwlccr 3 (I); , AB 50 Carolina-l V 50M 1 ' Eksolw = mcst ()1) AE ; - Il'lla K3. V YIVL. K Ccal Gar a bum: fcllar-r‘a‘fil'r En otlm‘n'wr (‘3 Al; : ob) {- W . allay”; chxlA-l’ ‘- bE ch; 4- [‘PAV) . Itilfioof = 1.131(1ho (T; —25.o'c,) K o b to mam-lat"? Ag: Ckv L A) 9 5h! M is F! lzoslm heal’ ° ”'Efi'fimgfwwwo'ff‘: [ l j °L PAS-E8 OF9 EXAM III - CHAPTERS 5 d: 6 SPRING 2010 - GENERAL CHEM W 12. Given the following data, cultula’re AH for The reaction: NO (9) + 0 (g) -—> N02 Lg) ' (n 2049—9302(9) AH=-427 RJ (2) Oz (9)4 20 (9) AH = + 495 RJ (3] NO(9)*03(9)—>N02(9)+02(9) AH=-199kJ Ram's: 61km \ '. 30.; ,9, .205 {)H : +H2'1 KI (m . > ' "by! —-r 03* 4. . OH = 'tz(q2-1 k1):- 2I3.5K3— fliuwu Egan 2.», 30 “a; 0.7. vL/F—m --fi,#—u»——fi--.fi,__m N4 = 4m: KI (>3! [’3’ 0 I 17* _’ ’93 H _ [>14 = ~29qu KI): 2415)::- x 1 -' *K.Hm—w-Jfl-~-mg___,_+,_.-.x_;‘k__ “4 W” '- 0J+o ——70 :H’k _ "P + W ; —3q K 3’ - X/ \H/ 1“ ~—— K“ \__, \KJ/f ----- a . 5'5“ 3 N” f 9% ~—7 NO; 1' (la/{3) AH‘ "l‘ifi KT g + — .. I *H‘ 0 AH - 5H 1‘ 4' {if T O ————) .......... 4 mun- __ __ __ Mun—"hm...“ “07 Wm —-? M) W PAGE 9 OF 9 ...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern