exam 1 fall 2007 answers

exam 1 fall 2007 answers - Chem 105 Exam 1 Fall 2007 Name:...

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Chem 105 Exam 1 Fall 2007 Name: ______________________________________ 1) Given the balanced chemical equation: 2Al(s) + 6HCl(aq) 2AlCl 3 (aq) + 3H 2 (g) If 2.35 g of Al is reacted with 75.0 mL 0f 0.73 M HCl, what is the maximum volume (in liters) of H 2 that can be formed at 295 K and at 745 Torr? (20 pts) 2) It is known that the 6s orbital fills before the 4f. Use the concepts of shielding and a graph of radial probability (with labeled axes) to explain this fact. (5 pts) 1
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3) The first ionization energy of K (electron configuration: [Ar] 4s1) is 4.339 eV. A photon with a wavelength of 297 nm is required to excite an electron from the 4s to the 5p orbital. Calculate the electron energy of an electron in the 5p orbital of K and the Z eff for an electron in the 5p orbital. Draw an energy diagram indicating the energies (that is, PUT THE NUMBERS on the graph) of the 4s and 5p orbital (and include the zero of energy as K + + e - ). (20 pts) 4) Convert the following from a line drawing to a complete structure (5pts) 2
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exam 1 fall 2007 answers - Chem 105 Exam 1 Fall 2007 Name:...

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