Chem%20111%20Midterm%203%202009

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

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Chemistry 111 - Section 112 Midterm Test #3– 20 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) (b) What is the shape of the nitrate anion?(2 marks) (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 - 1 Chemistry 111 - Section...

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