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exam1 - Name CHM3610 Spring 2001 First Exam On my honor I...

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Unformatted text preview: Name CHM3610 Spring 2001 First Exam February 12, 2001 On my honor, I have neither given nor received unauthorized aid in completing this exam. Signature Answer each question in the space provided. 1. (9 points) For each of the following sets of quantum numbers, state whether or not they describe a permissible solution to the Schrodinger equation. If they do not, explain why. If they do. indicate the orbital(s) they could describe? n I m, a. 5 3 -3 51C b. 4 4 2 fl: OJ/"'n-l flo+ rpcs‘S/b/C c. 1 0 -1/2 m1 = ’4) 3.1}... —,Q 51/me an “$5379” not rpasStlalc. 2. (8 points) For this question, consider the following list of atomic orbitals: ls 3c}:2 4px 4s 4d,(_v 2py a. From the above, list each orbital that has a spherical (radial) node. 4PYJ H3) ngv n-jrl sheriutl patties b. From the above, list each orbital that has at least one nodal plane. 7. I 3d} ) ‘1‘?!) QJYXI 29y j nodal pie/1&5 Name l é 3. (12 points) K has the electron configuration [Ar]4s‘. For this element, the 4s orbital fills before the 3d, indicating that the 4s orbital is lower in energy. 3. Explain why the 4s fills before the 3d. _ 3c! orbt‘i'ai IS shIeJJeJ by iJuL m‘ner SA¢/(; c/ec+rm5 my: Jim” 'IJ‘ ‘I’S' .7.“ {7’5 d”>"“4/ rpcvrmtra 754.? +1.: nun/GM (’Pfoéaé} II (A. it]! Mutiny/J «J7 144'164)’. *[W’fyfl I‘VL I: §41¢754¢fl /&$‘r, b. Does this observation agree or disagree with the solutions of the one-electron atom for the relative orbital energies? Explain. M ‘ / 3&4er 41‘2/1‘1 Wrefluf/S OPé/fi‘fi/ -€/r1lf;u7 an (7'1 L": ‘/3'L922/n7', (7:3 SAW/U? 64M /owtf aver?) {-‘Llaaw flty. FAwCW, {cf lift/find». q {—5744 has I): /I’irltr' C/ecfrmf +1: y/ne/J cm fw- ¢/¢¢.1‘fms J 53 +1! fl/caflm‘ hm dint-7 {759" fr? 0, cg; A/ app/% 4. (9 points) For each of the properties indicated in (a-c), rank the following our elements In ascending order. That is, order them from the smallest value of the property to the largest value. A1 C1 Na P a. Pauli Electronegativity Na4fl/4734C/ b. Covalent radius C, < 79 4,4/{A/q C. 2' (0r Zcffcctivc) Na 4 m A ’P 4 </ 5. (4 points) a. What element has the following electron configuration: 1522822p63523p64sz3d8 ? N“ b. What 2+ ion has the electron configuration [Ar]3d‘S ? Fc-Z-l- Name " \ 7. (12 points) Each of the following solids are dissolved in water to make 0.1 molar solutions. a. For each, indicate if the solution will be acidic. neutral, or basic. b. If after the solution is formed you adjust the pH to 7, how will the solution change? Choose from the following options: remains clear, becomes cloudy, evolves gas bubbles. Acid/base/neutral clear/cloudv/bubbles ammonium(III) choride Q at A Clo U A \Z sodium perchlorate Y\ am Era l ' C. léa r potassium phosphate _ a I C. [ea r" "POI-1 3 CrClz (in C/OM ci\ 111' C r'" . (16 points) For each of the following, draw a Lewis dot structure (be sure to include formal charges, if any) and assign the oxidation state of the central atom. ‘ Lewis structure Shape Oxidation state Nitrite ion . . 3 4. I e a [A § 0 ’BQn‘b ['2 SF“ .é/r [I‘m-15;“F 6/1- I .__ : ‘ t (SQ ermr S «2‘... Arsenate ion 06) l _ (‘3 {as A’ (:17an ' + O_ HIS .— 0 7‘1: 3 . 0(5) ICl4‘ Ll ,. ,0 _Il/“ Ll... r,” 2'" 3 I I k ‘ I \ Cl .0 Name K E )1 . (30 points) For this question, consider the list of elements in their indicated oxidation state and the series of aqueous predominance diagrams, below. a. For each predominance diagram, choose the ion to which it would most likely apply. (These diagrams are approximate, and the borders can shift by l or 2 pH units with changes in concentration or temperature. Therefore, choose the ion that most closely corresponds to each). b. Afler assigning an ion to each diagram, write the chemical formula of the species expected for each region within each diagram. For example, if the diagram indicates “Oxide ppt", write the formula for the expected oxide, if it says "Oxo anion", write the formula of the expected oxoanion, etc. 10—" 0 pH 2 4 6 3 to 12 14 3”» "list? Egg; .033“ 'Bdéél-lb Ca1+» CA1» Caok Cajun); w 4 Mai“ "aft «'2 3’ C. 5 0 L‘ (I? (3 J: F .r We) in: F” , at.) ...
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