midterm%203%20key

midterm%203%20key - Midterm 3 Key 1.430. 254,: Which one of...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1

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

View Full DocumentRight Arrow Icon
Background image of page 2
Background image of page 3

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

View Full DocumentRight Arrow Icon
Background image of page 4
Background image of page 5

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

View Full DocumentRight Arrow Icon
Background image of page 6
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Midterm 3 Key 1.430. 254,: Which one of the following is a correct formation reaction? .-\. C(diamond) —> C(graphite) ~+ graph; u r s {the 3% :‘ml-e B. Hztg) + 0(a) —> H200) *4 0.; f3) <1 C(graphite) + 4H(g) —> Cl-I4(g) —* H...” J l). 6C(graphite) + 6H20(s) —) Cal-{now} —P Hbo ,' 5 ma- a“ Q lemma- ®2ctgraphite) + 31mg) + 1402(4) —> CszOHa) V 2. (p. 355) Calculate the MW“.1 for the following reaction. (AHmr [Si02(.fi')] = -910.9 kamol; AH“? [SiCl4(g)] = 43510 kamol; AH°r [HCl(g)] = -92.3 kJImol; AH°r [HzO (g)] = -241.8 kamol) SiO;(s) + 4HCl(g) —> SiCl4(g) + 2H20(g) “"3335 4%.: EMHECPYMJ — 234 4H? WM) H.- . {.. -1044 k1 = ( AH;[;.a4t12]+g.A Hsogutgxoj) _[ 4H; ['L'Oztohmflfffuumj) 104.4 kJ 139.5 M 1-: [-1.510 4- 2 4 0241.9)? ~[- 714.? + mg, (42.3)] :. 1757.- g 00') 3. (p. N2; An infrared wave has a wavelength of6.5 x 10—4 cm. What is this distance in angstroms, A? .\.6.5x10“‘A — W ' ° ' 8.2.2x10—4A 63X“) u W” {09% x Mix = $.9xm4'A (24.6x103A ©65x104A 6.5 X 106 A 4. (p. 275; A radio wave has a frequency of 8.6 x 108 Hz. What is the energy of one photon of this radiation? .4..7.7 10—43] 4+ giggzgflfi E 3'- h D = 5.6%;{10 (115) x 9,6xmiC/5) .7x10’351 _ at _ n.1,7x10‘16J : 5"? X10 J a.>10"-‘J 5. rp. 3:5,: If the energy ofa photon is 1.32 x 10—”; J. what is its wavelength in nm‘? l)‘ .\_1.50x10“7nm F _ he ®lso.nm - r '5? g 9 L11.99x10‘5nm kc 6.6szio'waa’9K3floxr0 ht? t).1.99x10”nm = F = i.None ofthese choices is correct. l‘nglDUW/S’ _ -7 -7 IDQHM - J50X“) m ":— L§OMO m 2 {30. “M 6. 312?.” A modern compact fluorescent lamp contains 1.4 mg of mercury. If each mercury atom in the lamp were to emit a single photon of wavelength 254 nm. how manyjoules of energy would be emitted? @33x 10"") Em” o{- a stain [Ii-«4M “Cm-e M W wrote». .31 z = kc x -3‘f’ _ 3 . {£6.6x102] E “A =- “"6 'o T5 "‘ 09"") “15:185m'qJ 1'}. 3.3x103J 35+MD‘?M E-'.4.2><10'8J a, H “m . :2! WM: 15 h... 5 in Lq-w- , Lil—w —-—-—-x 5.01m) “ J “’i' 3 f]. 44w” 1:305?“ I I : ‘hzoxm'a' [H] air-n5) Jami W”)? 2. Muff?“ " “‘mwfirfie = 349.7 = MI 7. (p. no What type ofspectrum, ifany, would be produced ifthe light radiated by a heated atomic gas were to be dispersed through a prism? ..-\. a continuous band of color l%. a continuous band of color with some dark lines (missing wavelengths) (I only blue light 1}. only red light ®discrete lines of different colors 8. fir). 2m Use the Rydberg equation to calculate the frequency of a photon absorbed when the hydrogen atom undergoes a transition from m = 2 to n; = 4. {R = 1.096?76 >< 10T mfl) \.2.056><10"’:~C1 -J~ _ —I— 4-. _, ‘f -t _L._. .L. 112.742x1065“ A - R (“3 " ht) " “757751” M at "‘ it") ®.l6sx10143”' _ Z (956 2c roi’m“l §)\8.226x1014s_' * i , 4 8L .7 - '5 —' = —-———-—: .-. . m 2._>10 s A. 2-.056‘105 m: (mo 2): 12.545321; c -——- 7. z are "F A 4.8L¢x:o“7m 7 X") 05) 9. m. 280,: An electron in the n = 6 level emits a photon with a wavelength 0f4 l 0.2 nm. To what energy level does the electron move? I ___l.-—-- __ _L- , so; 9 [2mm .“""""5 A Tie-(n11. ‘3‘) ’ WW '5 ehiw’ 01.31:] n=2 fish out 4-0 a. [W lW-§0.n1~:6 tl‘. =3 ‘- 3).:=4 'A='{-10.1“'~\= ‘klOU‘ID 7'“ =5 _ 7 _L_ . . I .L. .1. Solee iv“ “1, ' ' ‘rwzxio'hxtpwvmo’wfl’ "9.: 0,1113 {fit-L :0. “LS-03’ “Ir-12‘. 10. m 3:9; The ionization energy is the energy needed to remove an electron From an atom. In the Bohr model of the hydrogen atom, this means exciting the electron to the n = 00 state. What is the ionization energy in kJ/mol, for hydrogen atoms initially in the n = 2 energy level? . '7 .J.. b .. .‘290kamol 3‘7 2 R (f. - J—m.) _.-. Lo‘tmsxio Q44) .4 = 2.7:” ,D h: _ 28th’mol . . _ . £3656th’mol 95°03" W *0 WWW W H ‘3‘“.- Mrfl'fl” ' ‘- . - q i). 983 kamol E;b.£- .. t 52‘ 0"”) 9M! [Oi-1 ‘1 -_—_ ‘4— " 1311 Wm] A . N 55 {3.015 ram 5) x (25H:- x m ) 5' 5m: 3' Fm, twin H drum ,. 5.45” no“: 2: 5.01::9‘3HA mt: 5.131Io" 3 :528 {25 ' w as “'34'5“t°“’5 tin-:1) =5-tc5'xw"?I Adm F~ {wt H odw; some”: anemia: 3.z8x'°";{,,-1 5:3 tar/wt. 1 l . (p. 284} The de Broglic equation predicts that the wavelength (in m) ofa proton moving at 1000. mfs is: @396x10—mm A _ h 61:24; mo'W-S 15.3.96): 10—?m '— WU : -17 t..2.52x106m “726%”; is x 1030‘ NS 112.52x 109m .. “to ig>101°m _ flame m 12. rp. 286) According to the Heisenberg uncertainty principle, if the uncertainty in the speed of an electron is 3.5 x 103 mfs. the uncertainty in its position (in m) is at least: -7>< 10—38“) me ' M-AV >/ it. 6.6x 10— m tunm oxkth- m I”). 66m 1-..None ofthesc choices is correct. .1 5"‘2‘6N0-NJ'5 a—L——.__________‘__'_ l3. rp. 289) The shape of an atomic orbital is associated with A the principal quantum number (n). @the angular momentum quantum number (I). t'. the magnetic quantum number (mg). l). the spin quantumnumber (m5). l-.. the magnetic and spin quantum numbers. together. 14. pp. 29!) Which of the following is a correct set of quantum numbers for an electron in a 3d orbital? :;-”=§4§=?~mr=-13 sot —" rm, ha. «em—r.) _{ 0 fl u {My}: ‘ = ‘mfz-l- . ‘ r 1 A I (..'.n=3,£=2,m,=3 Fowl“. MM, l'}.n=3,f=3,mi=+2 n=3J=2_.m;=-2 15. rp. 306) Which one of the following statements about orbital energies is incorrect? .-\. In the hydrogen atom. the energy of an orbital depends only on the value of the quantum number n. it. In many-electron atoms the energy of an orbital depends on both It and I. t ‘. Inner electrons shield outer electrons more effectively than do electrons in the same orbital. l). The Splitting of sublevels in many-electron atoms is explained in terms of the penetration effect. @The energy of a given orbital increases as the nuclear charge Z increases. 16.rp. 308) Which ofthe following sublevels is til (1 last? 17. no. 305) In a single atom, what is the maximum number ofclcctrons that can have quantum number n = 4? 3.113 than u of- Winn-at; ; n:- : It, (32 garnish, mum 9).. ourle use MK. *1 alums : lb“. =- £2, in. None of these choices is correct._ 18. m. 3H; Select the correct set of quantum numbers (n. I. rm, ms) for the highest energy electron in the ground stl i‘t‘ ,Sn. Gr A .J‘?‘§.‘é..‘fivz Sn: ‘2’: so, "312% We, EKrJSS‘Ird'WP" “5.20% . ".5,1,2,'/2 Cf hit.” {MEMO whulwl ®S.l (ll/2 _ +L 3.5.211/2 "‘5‘ l" 6" F, m CM M 4,0,4, was“:er L 19. 31335) Select the correct set of quantum numbers (n, 3, mg. ms) for the first electron removed in the formation of a cation for strontium, Sr. a .--\.5.l,0,-Vz $y, Z1332 elusvi bah-f9. [[01553- B.5,1.0. ‘/2 {110,194 6"“? 27“.- 5.1.l.'/2 55 glyph“ .‘g I’ll-MM“ 5, 0, 0, -‘/2 ‘L 1.. mg, ~830_£u0?"5’ So WL:O) w,:+a-W'L 20. fit). 3H; Select the correct electron configuration for sulfur (Z = 16). ..-"~.\ 1521 ,0625'22106 l K. 132232210831;“2 3,04 (7. 13225-221083523.02 (E13225221,:763523p4 I It 1s225221063$330"1 21. (p. 3J3) Select the correct electron configuration for Cu (Z = 29). at [Ar14s33d’ ®[Ar]4sl3dlfl gaffe CW1 {fife-L Qle-EM (4.44, a '. [Ar14sz4pfi3d‘ n. [Ar]4524a'9 T4314. 3 - ll- [Ar]5.s'24d9 22. :39. 3M Which ofthe following sets ofclcments have the [noble gas]ringer.ng2 valence electron configuration? A. O. Se, Te. Po l . f%.N.P.As,Sb.Bi 'l'“ 3"”‘1’ 4A. 21% (1F. Cl. Br, I. At @C. Si, Ge, Sn, Pb 1:. Ti, Zr, l-lf 23. rp. 3:5; In the electron configuration [Ar]4523d'04p4. which are valence electrons? .-\\ all ofthe electrons after the [Ar] it. only the 4.92 electrons { '. only the 3d"J electrons i). only the 4p4 electrons @both the 432 and the 4p4 electrons F01" M.“ In“? 9 lw GE ) , Val-0M; “ch5 m Mu. earl-Ly elaow‘ #5‘ M 4p“ elethg 24. (,0. 3:9; Which of the following elements has the smallest atomic radius? Sfize , Kb 7 5g))(gglefc H rrsu in m punt) Vlstb L.; > 2V2 J). r l'..Xe “FHA Xe .3» Ne ( on 0"“ jm’r) . '. Ne SnuJ/L-al' 25. rp. 328} Which ofthe following elements will form a cation with a +2 charge? .-\. ®Sr Gm? 51A. ns’, 0» 53‘ qcvv§r’ lama ae' +0 fwfr” ('.Ga ...
View Full Document

Page1 / 6

midterm%203%20key - Midterm 3 Key 1.430. 254,: Which one of...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online