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Version 056 Make Up Exam 1 Laude (53755) 1 This print-out should have 30 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 10/05/2008 11:00 PM 001 10.0 points Which of the following is a permitted combi- nation of quantum numbers? 1. n = 3, = 1, m =- 2, m s = 1 2 2. n = 2, =- 1, m = 0, m s = 1 2 3. n = 3, = 1, m = 0, m s =- 1 2 correct 4. n = 6, = 5, m =- 5, m s =- 1 5. n = 0, = 0, m = 0, m s = 1 2 Explanation: for n = 3, = 1, m =- 2, m s = 1 2 m =- 2 is not an allowed value n = 0, = 0, m = 0, m s = 1 2 n = 0 is not an allowed value n = 6, = 5, m =- 5, m s =- 1 m s =- 1 is not an allowed value n = 2, =- 1, m = 0, m s = 1 2 =- 1 is not an allowed value 002 10.0 points Which of the following is the correct Lewis structure of Magnesium Chloride (MgCl 2 )? 1. Mg b b b b Cl b b b b b b Cl b b b b b b 2. Mg 2+ , 2 bracketleftBig Cl b b b b b b b b bracketrightBig- correct 3. Mg Cl b b b b b b Cl b b b b b b 4. Mg Cl b b b b Cl b b b b 5. 2 Mg 2+ , 2 bracketleftBig Cl b b b b b b b b bracketrightBig- Explanation: 003 10.0 points What is the energy, in Joules, of a photon of wavelength 150 nm? 1. 9 . 94 10- 19 J 2. 1 . 33 10- 18 J correct 3. 8 . 21 10- 19 J 4. 1 . 33 10- 19 J 5. 1 . 07 10- 19 J 6. 7 . 52 10- 19 J Explanation: = 150 nm c = 3 10 8 m/s h = 6 . 626 10- 34 J s. For a photon c = , so E = h = h c where c is the speed of light and h is Plancks constant. E = h c = ( 6 . 63 10- 34 J s ) ( 3 10 8 m / s ) 1 150 nm 10 9 nm 1 m = 1 . 33 10- 18 J 004 10.0 points Which of the following compounds has only single bonds? I) SF 6 II) BN III) F 2 IV) SiH 4 1. II, IV 2. I, III, IV correct 3. II, III 4. III only 5. I, II, III Version 056 Make Up Exam 1 Laude (53755) 2 6. I, II Explanation: 005 10.0 points Which of the following statements concerning the Schr odinger equation and its solutions is true? I) The use of Cartesian coordinates simpli- fies the solution to the Schrodinger equa- tion for the hydrogen atom. II) An electrons exact location can be cal- culated using the Schr odinger equation. III) The Schr odinger equation for the helium atom contains three potential energy terms. 1. II only 2. I, II, III 3. II, III 4. I, II 5. III only correct 6. I only 7. I, III Explanation: Solutions to the Schrodinger equation are wave functions, which when squared express the probable location of electrons; but, the exact location cannot be known. Attractive potential energy terms are found in all solu- tions for all atoms. Repulsive potential energy terms are found only in atoms that have more than one electron, i.e. everything beyond hy- drogen. Polar coordinates are preferred for 3-D solutions because they simplify the math.... View Full Document

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