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EXAM III key - t 4L6 “ NAME fl WIKRENT CHM lolIN Exam 3...

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Unformatted text preview: t . / 4L6 “ - NAME: fl WIKRENT CHM lolIN Exam 3 l. Lighters are very useful devices used to create a portable flame. They consist of a metal or plastic container filled with a flammable liquid, such as 2-5 1—— — ._ —A—-~r¥v~~~— ever—1 liquefied butane (C4H10). To condense this gas, a " . .. _ _ ‘ ‘ - - - ; high pressure needs to be applied. (10pts) Phase Diagram Butane a) Based on the phase diagram of butane shown on this page, estimate the pressure that needs to be applied to liquefir butane at room temperature (15 0C). Justify your answer using the phase diagram. Kelvins = 0C + 273. 15+ 3.75 : 358 0 t . ' s 10 120 140 150 150 200 220 240 260 280 3©U Pressu re (am) 1 Temperature ( K) "Jasmin b) Some lighters burn solid fuel instead of a liquefied gas. What temperature should be reached to solidify butane at atmospheric pressure (latm)? «9’30 /___ “443% (as (‘cléill ‘1' Li W Rat? Ralmlctn 6&5 -_ 2. Analysis of a sample of LPG s ows the presence of a tlnrd substance with a strongly disagreeable smell that resembles that of leeks or onions. The substance seems to be intentionally added to LPG to impart an easily noticed smell to this otherwise odorless fuel. Elemental analysis of this compound reveals the following chemical composition: 38.66% C, 9.73% H, 51.6l% S. The mass spectrum for this substance is shown in the figure. Determine the empirical and molecular formulas of this compound. (lOpts) Agéww 1003 ’ MASS SPECTRUM Becca, (Met . gaziumfir ' [20)? w Cr.‘7gd], 5 [Nu\. 1: £3.75 ”Va 1" 5-: 'e S E. mommy. :13wa g 519 . ., . '10 20 30 : 40 M So 65:: I 70 ' ' S .. mfz (3.12 H‘l-75 Lil W 2"" "’ Mm ‘ [,m t m ‘ w 2:; flue C, “H S [implfildmj Mala/Hugs; QLg/MQ a L? 1kg lav; Mots; Eflgwfiflfie cw We hm.“ [flipppfii fl Leg Liquefied petroleum gas (also called LPG) is a mixture of pressurized hydrocarbon gases used as a fuel in heating appliances and vehicles, and increasingly replacing Chlorofluorocarbons as an aerosol propellant and a refrigerant to reduce damage to the ozone layer. (lOpts) La.) &) Varieties Of LPG bought and 5015. include mixtures Of Vapor Pressures for Propane and Butane both propane (C3Hg) and butane (C4H10), depending on the season—in winter more propane, in summer more butane. Using the data provided in the graph7 explain Why it is convenient to increase the proportion of butane, and decrease that of propane, as we go from winter to summer. 32am»? Bells ml’ 336' L $1¥cu¢ Balls 0!? 9:75 ’L’ Pressure (atm) 14 NW 5? W 1119 (22L? 6‘" , R -> - TemperaturelK) QM page] a Item ”“3 ”weave m nan/IMF;— (“Iv/m. {fig/L ,6 ((7.4 (gm/{7 7‘7“, [lytflafl 5W, Wade.- 41); [Owifuflg‘ b) Estimate the temperatures at which each of the two main components of LPG will boil at atmospheric pressure, latrn. Justify your answer using the vapor pressure data. 9a_§’ (C Uéfl‘V/flff’fiw : MWEPML fray-cw _ 0U” Peel‘s a?“ a7) 1L c) Propose an experimental procedure; separate the main components of LPG. r . . . “TN? M3 am 4- &ag-(«A 590 1c «Eari I??? )0 ,0 delta} m- Wm fem"? b? (“GO/iffy 1 FDlg’liiflficn ‘ Useful constants: h : 6.626): 10'34Js c : 3.00); 108 m/s 4. Calculate the energy of 1 photon of light with a frequency of 4.5 x 10 M 3‘}. (Spts) ’ ~; Pay 6 «5“? E “F )) -: 9.620? x/o I; [am ,< [a s -l 1 Qflé’xlo a: 5. Calculate the frequency of light with a wavelength of 4.5 X 10'7m. (Spts) 1” C '— ELQEWS \ @‘w7xl‘0 5-1 A 6,570,)”sz 1 IL; glam/0 Hz 6. Calculate the wavelength of 1 photon of light with an Energy of 45 x 10-171 (Spts) guhl/ A: h/ff" 2" ‘Z t 3/1" A : égazvgflogygfilf)m A , Way ,__ - 7 L-[flfld O \ j— ”i 7. Calculate the energy of 1 photon of light with a wavelength of 4.5 x 10'9m. (Spts) /\ 3 4, 4 7d 0 M —; f: h c ” chewy» B/gK/o‘gM/S) " {'{r 3‘» x( 0 IV) 7 E; 4:1,! ,X /Ov T E 8. Draw the Energy Level Diagram for Fluorine and Neon. (Spts) E ‘? it n 1. 919 - We ‘ "l “95 JV... "">’ as (‘09; (a C: fl& 9. Label the core electrons and valence electrons for Fluorine. (2pts) 10. Draw the Energy Level Diagram for Copper and Zinc. (5pts) (n C!» ‘7' % y» ll. Draw the Energy Level Diagram for K. Label which electrons are most likely to be involved in a reaction between Potassium solid and Chlorine gas? (3pts) / C, T “" L .— . 5 LA C324- ” 1‘4 31 ‘l‘v . , V it "2‘9 fry-9 (1‘8 66.5}me to ' £5 £9an (‘fl‘re EFF: 3’ 1V9? 79v pliable)? .er‘Qrejs d; :m i: (lug LoMQ bx M UcnfiMag 12. Write the Electron Configuration for Neon. (5pts) '1’“ 5’" Kauai} M V "L "1- h? We ‘1 ’9 2718 96' 13. Write the Electron Configuration for Iron. (Spts) lg»- /§‘9§1;95>‘€ 5$13fw931 a4"? 14. Write the Electron Configuration for Krypton. (Spts) K 5 5136‘s?”— gel We a)” 45,1 we 15. Explain the trends of ionization energy across a period. Use examples to illustrate your pointsfipts) fiam L‘KMMM 3,? 10m M “lanimb'vivx lime 2303 gamerroaafl WWWAI W W M spaille lull-0&3 ‘lMflr ’ngLW ”bu MEMO Quote) raw; L: ‘ W6“ 0» QM mime _ lee- ‘lWfl +W is? e SM M 7W“ MW" W WW W WW W. e ewe) e W eh»— C — 52%th ‘3 *Q ~ V902 7:“ WU: U KIM M N W W RP ‘4 “11% We. ILWVSJKELloLe/fl W &L 5 0 , gallium C r:— Wlecw Neg .. league/17l— la’l/ll‘lafiwm \fi/vl 644/7 I WIWAFSAebCa l 16. Put the following atoms in order of increasing atomic radius: Carbon, Lithium , Fluorine, Neon (5 pts) Wig <F<C<Li 17. Which ion would have the largest atomic radius‘l', O2+ (Spts) 18. Explain why Fluorine would have a negative electron affinity and Neon would have a positive electron affinity using an energy level diagram. (3pts). 2" (5’ A E ? F ’ .41 (,- Q’NZI‘J") b Wadflé M .11 11191.3 ' 1 éfl _ \( an dwcflwm lflbtlf; 1:!“ ”f _ "r' :ri/‘jiD/ . :DLRS 97° 711$ 19’ /7\ EA Ne Ne; 11 35 £11.;LWQJ 941%? fig nah-”flee LEE??? Layne/non SELL. 11925 ”2313/ '5 1x315 .01!) 15 ...
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