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Unformatted text preview: Chem 125 Exam #3 Fall 2010 PART A. (4 Points each) 1. For which orbital does the drawing represent the electron density (electron cloud)? Careful, consider the number of radial notes. a. A 1s orbital. c. A 2p oribital. e. A 3d orbital. b. A 2s orbital. d. A 3p orbital. 2. Which set of quantum mechanical numbers is CORRECT for an electron? a. n =2, l = 2, m l =1, m s =1. b. n =2, l = 2, m l =2, m s = 1/2. c. n =3, l = 2, m l =1, m s = 1/2. d n =2, l = -1, m l =1, m s = 1/2. e. n =2, l = 0, m l =-1, m s = -1/2. 3. Which of the following is the correct ground state electron configuration for sulfur 2- , S 2- ? a. [Ne] 3s 2 3p 6 b. [Ne] 3s 2 3p 2 c. [Ne] 3s 2 3d 6 d. [Ne] 3s 2 3p 4 3d 2 e. [Ne] 3s 2 3p 5 4. If Mn 1+ existed, how many unpaired electrons would it have and is it diamagnetic or paramagnetic? a. 6 unpaired electrons; paramagnetic. [Ar] 4s 3d b. 6 unpaired electrons; diamagnetic. c. 4 unpaired electrons; paramagnetic. d. 4 unpaired electrons; diamagnetic. e. None of the above is correct. 5. Which is the correct ground state electron configuration for molybdenum, Mo? Careful. a. [Kr] 5s 4d b. [Kr] 5s 4d c. [Kr] 5s 4d d. [Kr] 5s 4d e . [Kr] 5s 4d 0; ; 1/2 l s n l m l m = Two half full orbitals are more stable for Cr and Mo. 6. An exited electron in a hyd Which change emits a pho a. n = 5 to n = 3 b. n = 7 to n = 5 c. n = 12 to n = 10 d. n = 15 to n = 13 e. n = 27 to n = 25 7. Which of the following rea a. ( 29 ( 29 2 2 2 Pt O s Pt s O + ( 29 ( 29 4 . 3 4 Fe reacts with steam D b SnBr aq Fe s + ( 29 ( 29 4 2 . 2 c SnBr aq I aq + ( 29 ( 29 2 5 2 . d N O g H O l + e. ( 29 2 SnO s no reaction 8. As you go across a row (le true? a. The effective nuclear ch b. The first ionization ene c. The size of the atom de d. The elements become l e. The electronegativity in 9. For which of the following a. Cu, Cu + b. K, Na c. F, Ne d. F, F- e. Pb, Si 10. Which of the following i a. KCl c. Na 2 S b. KI d. Rb 2 O A ato Chem 125 Exam #3 Fall 2010 drogen atom emits a photon as it drops to a lo oton with the highest frequency?...
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