test1practicesolutions

test1practicesolutions - CHEMISTRY 131 Answers to practice...

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1 CHEMISTRY 131 Answers to practice problems for Test #1 1. De Broglie proposed that particles in motion can be treated as waves, and that their wavelength could be estimated by classical mechanics from E = h ν if their energy was known. He drew directly on the ideas for which Einstein won his Nobel prize (the photoelectric effect), in which Einstein proposed that light (considered a wave) could be treated as a particle called a photon. 2. a) 3s: 0 angular nodes, 2 radial nodes; b) 4p z : 1 angular node, 2 radial nodes; c) 4d xy : 2 angular nodes, 1 radial node. 3. a) Li, because the e is being removed from a 2s orbital, where there is a higher Z * than in the 6s orbital of the Cs atom. The 6s e are much better shielded from nuclear charge. b) F has a higher Z * in the orbital from which the e is being removed; it is less shielded. c) The electrons in each atom are being removed from the same orbital, but the Cu has a higher Z * in this orbital since the number of core electrons has not changed. So it should be easier to remove an e from Sc. d) The electron in Pt is much better shielded, so it is easier to remove. 4. The second e removed from Na comes from a 2p orbital, where there is much more Z * than in the orbital from which the second e in Mg is removed (3s). So, it requires more energy to make Na +2 than Mg +2 . When comparing the third ionization energies, the e are now being removed from the same orbital (2p). Since Mg has more protons than Na, it has an even higher Z * in this orbital, so it is more difficult to form Mg +3 than Na +3 . 5. Z
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This homework help was uploaded on 04/18/2008 for the course CHEM 131 taught by Professor Landry during the Spring '08 term at Vermont.

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test1practicesolutions - CHEMISTRY 131 Answers to practice...

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