CH301- Lyon- fall 07 test2

CH301- Lyon- fall 07 test2 - Bhadkamkar, Mohin Exam 1 Due:...

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Unformatted text preview: Bhadkamkar, Mohin Exam 1 Due: Oct 3 2007, midnight Inst: Donna C Lyon 1 This print-out should have 30 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points Which of the following electron configurations would represent a halogen? 1. [He]2 s 2 2 p 3 2. [Ne]3 s 2 3 p 5 correct 3. [Ne]3 s 2 4. [Ar]4 s 1 5. [Ar]3 d 5 4 s 2 Explanation: Halogens are members of Group 7, so this means that they have 7 valence electrons. From the noble gas configurations above, [Ar]3 d 5 4 s 2 and [Ne]3 s 2 3 p 5 both have 7 outer electrons. But if you check your periodic ta- ble, you see that manganese has the config- uration [Ar]3 d 5 4 s 2 and does not belong to group seven, so the only halogen present is [Ne]3 s 2 3 p 5 . 002 (part 1 of 1) 10 points An electron in a 3 d orbital could have which of the following quantum numbers? 1. n = 3; = 0; m = 0 2. n = 2; = 2; m = 6 3. n = 3; = 2; m = 0 correct 4. n = 3; = 3; m = 1 5. n = 3; = 2; m =- 3 6. n = 3; = 1; m =- 1 7. n = 3; = 1; m = 2 Explanation: 3 refers to the principal quantum number n . d corresponds to the subsidiary quantum number = 2. Since = 2, m could be- 2 ,- 1 , , 1 or 2. 003 (part 1 of 1) 10 points Which neutral atom has the smallest size? 1. Be 2. Li 3. F correct 4. O 5. B Explanation: The answer to this question will be the atom with the smallest atomic radii, which (within a row) depends on the number of protons in the nucleus. The more protons an atomhas, themoreitwillattracttheelectrons and the smaller the atomic radius will be. Go- ing down the periodic table, electron sheilding increases, so the effective charge experienced by the outermost electrons decreases. 004 (part 1 of 1) 10 points The Lewis dot structure for an isolated sele- nium (Se) atom has 1. two pairs of electrons and two lone elec- trons. correct 2. three pairs of electrons. 3. four pairs of electrons. 4. four lone electrons. 5. one pair of electrons and four lone elec- trons. Explanation: 005 (part 1 of 1) 10 points Which of the following statements is true re- garding electromagnetic radiation? Bhadkamkar, Mohin Exam 1 Due: Oct 3 2007, midnight Inst: Donna C Lyon 2 1. Electromagnetic radiation with a wave- length of 400 nm travels faster than that with a wavelength of 600 nm. 2. Electromagnetic radiation with a wave- length of 400 nm has a frequency that is lower than that with a wavelength of 600 nm. 3. The frequency of electromagnetic radia- tion determines how fast it travels. 4. Electromagnetic radiation with a wave- length of 600 nm travels faster than that with a wavelength of 400 nm....
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This note was uploaded on 02/21/2010 for the course CH 5423 taught by Professor Mccord during the Fall '06 term at University of Texas at Austin.

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CH301- Lyon- fall 07 test2 - Bhadkamkar, Mohin Exam 1 Due:...

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