Exam III Key - Chemistry 211 General Chemistry I Fall 2006...

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1 Chemistry 211 Name:__________________________________ General Chemistry I Fall 2006 Exam III All questions must be answered on a Scantron form. Multiple choice questions are provided with answers a-e, and only one answer is correct. True or False questions are answered either as a (true) or b (false). You must sign the honor statement on the exam form below to receive credit for the exam. Turn your Scantron form in to correct envelope and the exam to the box in front of the classroom. The exam total is 100 points, with each question worth 100/35. I have abided by all aspects of the GMU honor code on this exam.__________________________________ (1). Which of the following orbital diagrams represents a diamagnetic atom? a. Option 1 b. Option 2 c. Option 3 d. none of these e. all of these (2). A section of the periodic table with all identification features removed is shown below. Which element has the smallest atomic radius? a. V b. W c. X d. Y e. Z (3). What is the wavelength of light emitted when the hydrogen atom undergoes a transition from level n = 5 to level n = 2? R J H - 2180 10 18 . E = -2.18 x 10 -18 J(1/5 2 - 1/2 2 ) = 4.578 x 10 -18 J; λ = hc/E = (6.63 x 10 -34 J-s x 3.0 x 10 8 m/s)/4.578 x 10 -18 J = 4.34 x 10-7 m = 434 nm a. 663 nm b. 434 nm c. 546 nm d. 521 nm e. 833 nm (4). Which of the following combinations of quantum numbers are permissible? n l mm l s 1 3 3 1 12 2 4 3 0 3 3 2 1 . / . / . / - - + a. 1 only b. 2 only c. 3 only d. 1 and 2 only e. 2 and 3 only (5). All the following have a standard enthalpy of formation value of zero at 25°C and 1.00 atm EXCEPT a. Ne( g ). b. CO( g ). c. Fe( s ). d. C( s ). e. F 2 ( g ).
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2 (6). A 1.00-g sample of solid calcium was burned in fluorine to give a 1.95 g sample of pure CaF 2 . The energy given off in this reaction was 30.3 kJ. Given this information, we can say that the heat of formation of 1 mol of CaF 2 is -30.3 kJ/(1.95 g CaF2 x 1 mol/78.076 g) = -1210 kJ a. –30.3 kJ. b. +30.3 kJ. c. –1210 kJ. d. +1210 kJ. e. +2370 kJ. (7). Which quantum number distinguishes the different shapes of the orbitals?
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Exam III Key - Chemistry 211 General Chemistry I Fall 2006...

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