chm 2 quiz - CflM 2045EG Fall 2007 QUIZ 2 Sal—U1"...

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Unformatted text preview: CflM 2045EG Fall 2007 QUIZ 2 Sal—U1" '0” 5 Form A . _ A' Useful information: NA = 6.022 x 1023 h = 6.626 x 10‘“ J s c = 239792458 x 108 m s“ R(Rydberg’s constant) = 1.097 x 107 m" 1 eV = 1.602 x 10‘'9 J 1 J = 1 kg m2 s'2 1 rydberg = Rhc = 2.18 x 10‘'8 J m. = 9.11 x 10‘“ kg ' @ 5‘: Po‘cn+$ l. (5 points) In the blanks, enter the number of the total orbitals defined by the foll0wing designations? "=3 L63 t=4 L@ 2p. 5f 7 2d 0 O 2. (10 points) Nickel generally forms 2+ ions, but in alkaline batteries, engineers have used Ni3+ in the compound NiOOH in their design. Propose orbital energy diagrams (valence shell only) and the noble gas (condensed) electron configuration for each ion. Are either of these ions paramagnetic? , Na“ 1. an“ ltlleLLCZD 1Mk111@. 6’s .__. 3.4 3. (5 points) Give one. allowed set of four quantum numbers for each of the five valence electrons for phosphOrus beyond the preceding noble gas, neon. ‘ 1 1 7- 1'3 ~4— 120 115 1L- “37’” 3 o 0 +35 6) :40?“er 3: P I (M 3 o o «3; CD are 3. ‘ -\ +{ G at (MAE 3‘ \ o «#5, Q 3 l H +3L Q 4. (10 points) What energy level transition in the hydrogen atom emits an energy of 4.58 x 10—") J/photon? Hint: It produces a line in the Balmer (visible) series. I e; = «a. or AE=Er€:=—m~c<i’=—zzfl L . ’ g a _ . ' GD 1»: be. 4”“ “'Dw‘sxs‘iax‘t’ “5 9-14.34 x151. - «mam -» WW ’- M ~ 5 4.58 MOW”) g}. @ l ‘3- LO‘V’WDfim‘K; .....L m5“: «*2 C2) " _. '7 4.39 5H0 M n. n 5 2} hit)— ‘ ~ . 5. (5 points) Your eyes receive a signal consisting of blue light at 3. = 470 nm and at an energy of 2.50 x - 10'” J. How many photons reach your eyes? ” . 9 .1 - ® E: a3 __ (6.524xl0 3NM§>=$ZXW 6.! J .. 5.9 x \0“ (Pkg-hm: 6. (6 points) Consider the following: Predict the sign of AH and explain each result with one concise statement. CD 'A)Na(g)+Rb‘(g)—+Na‘(g)+Rb(g)Al—Ko Sodium {a Smmler g has 4.. areq‘kt‘ a“ a443n£+y® B) K+(g)+Cs(g)—,K(s)+Cs*(g) AH<o Cesium is (av5c.r glans lower 1.6, 7. (4 points) Propose a formula for the following: A main group 3+ ion and a main group 2- ion and both are isoelectronic with respect to the period 4 noble gas. ' . inlsgg @ (AM or “one on 94-5) 8. (5 points) The following ions are in no particular order. Rank them in order of increasing ionization energy: ._ 2+ 4- -‘ cr,Ga3+,sz‘,K*,Ca2+ £<§L<£<Ca < 43 ‘l w- /b\¢m\<_ 9. (16 points) THINKING DEEPER EXTRA CREDIT CASE STUDY (OPTIONAL): A materials engineer in the electronic chip industry uses photoelectron spectroscopy (PES), similar to Einstein’s photoelectric effect, to study the surface qualities of silicon. Silic0n atoms were excited by X-rays at l. = 4 0.989 nm. The spectrum showed four distinct peaks which correspond to the electron speeds below; Peak Speed of Electrons (m s") Tia-,6 33 clefifl‘gmj.’ m arc“ glm “4.453 “3 [I :333133 W c‘wb‘a 2.014 x 107 1.971 x 107 AMNr—t A) Calculate the four ionization energies (IE) in electron-volts (eV) of the electrons in the four peaks. Hint: IE= hn- l mevz E: Lo :: hc =(é.526x10"3“4«s)(2.9‘l€x 109.145“) r . 2 .._ Wm " 7.390 worm,“ \ --lb .44, ' E: 2.0535 mm a =2.oossxm 4(qum-rv ' For 9mm 1le A - : 1253.6).ev C23 ' -31 "7 ~ iEV ’ . 2.097mes, (M. @755 C1) 2 I263.Q>e\l- (9 ““D 194-3“ ) hwmua . = 3.52V -, , _ @IECZ.) : 8.3m} @TEECB) = mo.sev @mcq) .= wezev ‘CV’OM anq‘m39u3 Calms B) Assign each peak to an orbital of the silicon atom. You do not need to consider the 1s orbital. Q 3;; =3: 3.5ev Veak l * lees-l +35M+l3 lac:an e“; Cowl?) _ G) 35:» 8.3m: 2 1. CD 2,: :9 WWW 3 -mw.++3w., ‘Dbuad e—S nsz » Q 2; => H‘LZeU Ll (Wye? IE) M204 . .F 112007 U1 2 L l N~5 I FormB ‘ Useful information: NA = 6.022 x 1023 h = 6.626 1110‘34 J s c = 299792453 x 10‘ m s"' ' R(Rydberg’s Constant) = 1.097 x 107 m’1 1 eV = 1.602 x 10‘'9 J 1 J = 1 kg m2 6‘2 1 rydberg = Rhc = 2.18 x 10"8 J m, = 9.11 x 10’“ kg 1. (5 points) In the blanks, enter the number of the total orbitals defined by the following designations? n = 4 [5 » 1= 3 _'_7_ 3d”, 1 4f 9 7 3f 0 2. (10 points) Nickel generally forms 2+ ions, but in alkaline batteries, engineers have used Ni3+ in the compound NiOOH in their design. Propose orbital energy diagrams (valence shell only) and the noble gas (condensed) electron configuration for each ion. Are either of these ions paramagnetic? Same. as For!“ A 3. (5 points) Give one allowed set of four quantum numbers for each of the five valence electrons for nitrogen beyond the preceding noble gas, helium. ‘ :g m ¢ m s 1 4 1. w 3"? ’l \4 --z-- z '— P Zs g 2 Z Z l 2 4. (10 points) What energy level transition in the hydrogen atom emits an energy of 4.09 x 10—” J/photon? Hint: It produces a line in the Balmer (visible) series. same aqua.“ o‘,‘ 3 as ForMA O _ kc ($626 a: bo'3‘3~.s)(3.oo xngmsfl.) q A ‘ “- = I . u— ‘7 = l .. 1 - l J... @‘wéx mam -0097 mg m x) (3.1 .. “(A {11:4 n:L)—-~>n:7_® 5. (5 points) Your eyes receive a signal consisting of blue light at l. = 680 nm and at an energy of 2.50 x 10—” J. How many photons reach your eyes? —34 9 ~' ' (—9 5 =13 : (4.4.24qu J'S)(3'°°""°M5 212.9 )(ID—___J___ A 6.9 x 1 0'7”. aka-v.4 GA) 2.50 “05"”3 W .g 3.6:, gut)”, 'Plne‘l'ons 2.3 x of”; Nun‘an OVER -—-> 6. (6 points) Consider the following: Predict the sign of AH and explain each result with one concise statement. A) N3(g) + Rb—(g) -’ Na.(g) + Rb(g) Sam e. a 5 fine m A B) K*(g) + Cs(g) —» M) + Cs*<g) 7. (4 points) Propose a formula for the following: A main group 3+ ion and a main group 2- ion and both are isoelectronic with respect to the period 3 noble gas. V. Gulls.3 8. (5 points) The following ions are in no particular order. Rank them in order of increasing ionization energy: Cl", Ga“, 82‘, K, Ca2+ S a. < Ci” < K+ <04 < 6m 9. (16 points) THINKING DEEPER EXTRA CREDIT CASE STUDY (OPTIONAL): A materials engineer in the electronic chip industry uses photoelectron spectroscOpy (PES), similar to Einstein’s photoelectric effect, to study the surface qualities of silicon. Silicon atoms were excited by X-rays at 2. = 0.989 nm. The spectrum showed four distinct peaks which correspond to the electron speeds below: Pegk Speed of Electrons (m s") 1 2.097 x 107 2 I 2.093 x 107 3 2.014 x107 4 1.971 x 107 A) Calculate the four ionization energies (IE) in electron-volts (eV) of the electrons in the four peaks. . , Hint: IE = ho - :- mtv2 3mm. 0S i‘UtM A B) Assign each peak to an orbital of the siliconatom. You do not need to consider the 1s orbital. $111“. as. ...
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This note was uploaded on 02/11/2010 for the course CHM 2045 taught by Professor Mitchell during the Fall '07 term at University of Florida.

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chm 2 quiz - CflM 2045EG Fall 2007 QUIZ 2 Sal—U1"...

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