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Fall+06+Exam2 - CHM 2045 Exam 2(Form Code A Instructions On...

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CHM 2045 Exam 2 (Form Code A) October 20, 2006 Instructions: On your scantron sheet enter your name, UF ID number [in place of SSN] (start on the first space and leave the last space blank), Discussion Section No. and Form Code (see above). This exam consists of 20 multiple choice questions each worth 10.0 points for a total maximum of 200 pts. You may retain your exam sheet (mark your answers on it and the scantron sheet). Turn in only the scantron. Bubbling errors will count as an incorrect response. Useful information: c = 2.99 x10 8 m/s; h = 6.63 x 10 -34 J s; Rhc = 2.179 x 10 -18 J; R= 1.0974 x 10 7 m -1 ; N A =6.02 x10 23 mol -1 ; c’ = 4.184 J/g ° C for liquid water; 1 J = 1 kg m 2 /s 2 . 1. Which of these has the largest number of unpaired electrons? (1) 23 V 2+ (2) 24 Cr 2+ (3) 26 Fe 3+ (4) 27 Co 2+ (5) 28 Ni 4+ 2. Rank in the order of increasing ionic radius : Br - , Te 2- , I - smallest→largest (1) Br -1 < I -1 < Te 2- (2) Br -1 < Te 2- < I -1 (3) I -1 < Te 2- < Br -1 (4) Te 2- < I -1 < Br - 1 (5) Te 2- < Br -1 < I -1 3. A ruby laser emits red light at a wavelength of 694.3 nm and an X-ray generator emits radiation with a wavelength of 1.544 x 10 -10 m. How many more times more energetic is a single X-ray photon of this wavelength that a photon emitted by a ruby laser?
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