Chemistry 1A - Fall 2000 - Pines - Midterm 1 Version D

Chemistry 1A - Fall 2000 - Pines - Midterm 1 Version D -...

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Unformatted text preview: Chem/fishy 1A Fall 2005.» Midterm Exam I, version D September 19, 2000 Wed book, 75 minutes, 105 points) ‘\ Name: _ Section Number: SID: T.A. Name: \ Identification Sticker Exam information, extra directions, and useful hints to maximize your score: Write your name on all six pages. There are two parts to the exam: 1) multiple choice and 2) short answer problems. For the multiple choice problems, fill in the ScantronTM form AND circle the answer on your exam. Answer the questions you know how to do first, then work on the questions you skipped. Show all work on the short answer problems for which you want credit and do not forget to include units! You may use the back side of the exam pages to show your work and/or for scratch paper. Unit Prefixes milli, m (x 10'3) micro, it (x 10‘6) nano, n (x 10") kilo,k(x103) mega,M(x106) giga,G(x109) Some possibly useful information: (Do not write in this box; it is for official use only.) Ephoton = = Em (e') = hv — (I) = hv - hv0 = mv2/2 xde Broglie= h/P = h/mV -' of 6 Name: .art 1: Multiple Choice. (3 pts each, 45 pts total) Instructions: Bubble in the correct answer on your Scantron sheet AND circle the answer on your exam. Each question has one correct answer. 1.) The answer to question 1 is D. Bubble in D on your ScantronTM form. 2.) Which is required in the greatest quantity (mass) in order to produce 1 gram of Br2? A.) HBr B.) NaBr @ KBr D.) MgBrz E.) CaBrz a 0 [Q1311 37/01 é—iolc up]. (’94) Yam); ‘(1 363(fl773 7,“ 4 0 3.) Which has he grog“: equal to twice that of 16O at the same speed? ) .5 3~ {5 , é c’ Wei 3.” l l‘. A I,“ {A ’ A.) 325 B.) 24Mg C.) 2°Ne @B E.) 4He 3 3' ‘ 4,, I / L f Y 10 4.) Including the structure below, how many structural isomers of propanol exist? . i l j“ . ‘2: c i a 2 4. CH3— CH2— CH2— OH v}. r L, g 3. N -.. i a *t ‘ A.) 4 B.) 3‘ C.) 2 D.) .1 E.) 0 x..- \ " ‘ ' \ _..,----' " 5.) Which of the following amino acids is'glit‘chiral? (note: the H atoms are not shown) 4,‘ .0. u o (0L B 1*" N ‘3—0/ 45-0 D ) Wig? i E D33;- 56 L}. r -’ wf"r\ " - I Q—C- C Q9, 1 T“! 6.) Which of the following molecules has an electric dipole moment? H H H H ' c1. Cl " . c1 H ac: 1 $2 '1 6;? \c=‘c/ \c=C’ \C'=c/ 9 7 1 ~ / r / \ ~. ,, \ / ‘. \ / \ A.) H, ‘v H Bg’H c.) C?! H D.) C1 C1 @H ‘ .ge 3 of6 7.) ' 8.)! ‘~.../ in O V 3' '\-«- gawk. 5/, . _ 12,? 44 46 48 13-) 44 46 48 C) 44 46 48 a 13-) 44 46 48 44,46 48. ‘3 5, :1: Nail?" \/'\ I.“ s :1 1 I“, Z+ié“”'° 5;? x“ "3 '2 C ‘. V l A“ ,4. L» V ‘3 ’ f 9.) How many grams of CaC03 are formed from the reaction of 56 g of C210 and 56 g of C02? —\\ A.) 44 B.) 56 @100 D.) 112 E.) 128 g L I \‘ WV”? 139:) W ~ \ 10.) Which 3f the following is entirely composed of ions that areflisoele'ctronic’ with Ar? No 15:" :54“ 8:“ N9: U‘ M U r» _L’ A.) NaBr B.) CaBrz C.) MgClg ‘ D.) NaCl E.) , C1 l0}- _t8' “7., ‘ 104.18 ‘/3‘ :8 11.) Shown is the standing wave electron wave function for n=l. For which yin the wave function Name: Shown is the graph depicting the quantity of P4010 accumulated in the oxidation of P as a function of added P for a fixed amount of 02. Through which point would the graph pass for a similar reaction with access to half the amount of 02? 5 A mixture of one—third 12C, one-third ‘60, and one-third 18O reacts to form pure C02. Which is the correct mass spectrum of the C02? ‘ ” ‘ ‘ 3 , "—1., 4 B.) C.) 3 D.) 2 E.) l 4.? I/ pass through all three points? A.) 0 B.) l c.) 2 E.) 4 ,ge 4 of 6 Name: 12.) The absorption spectrum of a given compound is shown below. What color does it appear under illumination with green light? 3 < N B Violet A.) black B.) red een D.) blue E.) white ' 13.) (/ConSider the electroly51s of 10 g of liquid water into hydrogen and oxygen gas. Approx1mately v what volume of gas will be formed? \ C S )4 CD “Z 4' LI" A.)~1m3 B.)~1L c.)[email protected]~10L E.)~1kL \, Yr“ ' .2 “A v i 14.) Which of the following has a linear molecular structure? .. ~ A.) 802 B.) H28 £- (‘ LA \,',‘_ . i5 _ 6 Tflk33 L‘ 9"" ,r "E ‘t "\ s 15.) Ionization energy (IE) is the energy required to remove an electron from an atom. For which pair X + Y below will transfer of an electron from X to Y occur at the / gestsdistancehto form ions, X+ \. (")3 ' .r’t dY'? * - = ' l A A. an m " :v’ ’/ *1 I e "’ “"“*-’ fit} I x K 1 Li :J‘ \ E ‘ ’bwf’“ A.) Li+Br B.) Na+Br c.) K+Br D.) Rb+Br ~v s+Br /\ 6F Page 5 of 6 Name: Part 2: Short Answer Problems (60 pts total) Instructions: Enter answers in the boxes provided. Show your work. Where reguested write explanations in fifteen words or less. l (30 pts) 1.) The minimum amount of energy a photon needs to eject an electron from a metal M, occurs in the z,"— infrared at A. = 800nm. I K: a) Sketch the photoelectric graph (i.e. Bum“ vs. v) for this metal using the given axes. h: r kc. time h - "rt/«Mum \y .“£'___" ‘" J A >5 (4 ; I; ‘ X to ’2 ~ I ‘ F; " ;/ : QGZGM" ,‘ BI'O u KL—m” ‘mww __MW:...-.-m-~~‘;--m:§ .45 ~ no" u ‘6 '7, ‘ " t. 4 ‘r tn?” .5 v; 3,7534» ' A: 8 {jo‘j o _9Lf;,uo 4’48 2 4 6 8 10 12 u(Hz)/l014 b) What is the energy of an incident blue with 7» =400111m‘YLl,l.t.j'kj‘<lF r - ‘hc- C £522; in "‘ ’ f," I V "" “P\ N mm.” A f 2‘ 251:: o“ k ' éf‘Ko'rmr: ; 5" Yr Hg” ‘5 c) What is the kinetic energy of an electron ejected from M by the photon in part b)? ‘— Y 17 ' t "V ‘- 3“;ch / c: j. r 4 W'l‘ "K s .a __. t a- .1 ,/ z 7 X39 .. ,z_‘t‘.~. -‘- 3 _\ V: «f «a . E c ~ : a . 5* v s p ..2 g ‘ d) Calculate the de Broglie wavelength for e electron ejected in part c). , 1" . - e , 3% K6; luv 3“ a. ,\ 1': L A = éitfivfiiiimg t: v A - 4w ‘ - no} swer: . mm x W («tamwint ' N l ‘ r I ‘ r .7. * IX : - 745W “v Veto“ ’4 L794 W V e) 800 nm light corresponds to transition 391 in the energy level diagram shown below. All] hat 1 corresponds to the 4-)1 transition? [\z ' - ). Q E : hi. : 506‘?th L, h ‘jq , x." m “‘9 w": .2 , 5‘ U , . \’ \.:¥._A~Lx . v Page 6 of 6 Name: (30 pts) 2.) A compound containing only carbon and hydrogen, is combusted with oxygen. a) Shown is a mass spectrum of the combustion products. Identify the producS. 4" .32 ? (“fl ‘H’ x " (1H; +502 / “Lt/b “ L ., - . . p Product 2: e 2 :5 oz 18 44 b) Based on the ratio of peak heights in the mass spectrum, determine the empirical formula of the unknown. 1 Y \ \ “.- w , ‘ ? Cg L“ \I 4 “(:7 ~/ci{.c) 7' r30 . « 2, “" ‘ AnswerzH ( 6 C7 1/ H 7’ g H, ‘i I l C ggo. +,o- awe: .e 2 {v c) The molecular mass of the unknown is 26 g/mol. What is its molecular formula? w : r F“ 9.5.. ' 7: ~Mg‘+*~ fr: ’ ~_.- $3.3. q. m . 95 r v» t. I, .r'“ ‘3 i“ \ M x t\ V, d) Draw the Lewis electron dot structure for the unknown. \ ‘\‘ é— a!) *(9; ‘1’“. l r P f... é'“%:C*H e) Which is true for the H—C—C bond angle (9) in the unknown? Circle the appropriate answer and explain. Explanation: T56 "“Wf m!“ J 3"“ "5‘" w, New an“ ‘9“ SHAW 9:109.5° e =120° WM. “he axe-rm" in cm H é NM Paint. 7'“ bout 9 *3 W ...
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