Chem%20111%20Midterm%203%202009%20Answers

Chem%20111%20Midterm%203%202009%20Answers - 1 Chemistry 111...

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1 Chemistry 111 - Section 112 Midterm Test #3– November 2009 Name ______________________________________ Lab Section____________ Bench#_____ Avogadro’s number = N A = 6.022 x 10 23 mol -1 Gas Constant: R = 0.0821 L atm mol -1 K -1 1m = 10 9 nm = 10 12 pm 1g = 10 9 ng = 10 12 pg 1km =10 3 m Velocity of Light: c = 3.00 x 10 8 m s -1 Planck’s Constant h = 6.623 x 10 -34 J s Rydberg Constant R = 2.18 x 10 -18 J Bohr Equation: E n = - R z 2 /n 2 = c E = h 1.(a)Draw the Lewis electron dot structure (including any resonance hybrids if they are possible) for the nitrate ion, N O 3 - ?(6 marks) O N O O O N O O O N O O 0- 1 -1 +1 (b) What is the shape of the nitrate anion?(2 marks) Trigonal Planar (c) On one of the hybrids show the formal charge on each atom (4 marks) 2. The eye can detect 2.35 x 10 -18 J of blue-green light of wavelength 500.0 nm. What is the minimum number of photons of this wavelength that the eye can “see”? (6 marks)
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Chem%20111%20Midterm%203%202009%20Answers - 1 Chemistry 111...

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