Review Session prelim 2

Review Session prelim 2 - where the electron is most likely...

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1. Draw Lewis structures for the following molecules or ions and state the formal charge on each unique atom. Also state each molecule or ion’s 3D molecular structures. Indicate if the molecules or ions are polar or non-polar. a. BCl 3 b. XeF 4 c. PBr 3 d. CS 2 e. ClO 4 -
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2. a. The 5s electrons in indium (In, Z=49) and 6s electrons in thallium (Tl, Z=81) require more energy to ionize than the 3s electrons of aluminum (Al, Z=13) and the 4s electrons of gallium, (Ga, Z=31) respectively. Explain why. b. In looking at the ionization energies across row 3 (Na to Ar) there are local maxima at Mg and P. Using electron configurations, explain why?
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3. a. Sketch the cross-section of a surface of constant probability for a 5dyz orbital. Used dashed lines for nodes and use solid lines for curves of constant probability. Label the coordinate axes. Label the plot with “+” and “-“ to show the sign of a wavefunction. b. An electron is located on a line of length 15pm. Its wavefunction has a wavelength of 6pm. Sketch a graph of the wavefunction verses location. Label with symbol * locations
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Unformatted text preview: where the electron is most likely to be found and label with a 0 location where the electron is least likely to be found. 4. Predict which of the complex ions, [MoCl 6 ] 3-and [Co(en) 3 ] 3+ is diamagnetic and which is paramagnetic. 5. a. An atom of hydrogen can emit light in a process that leaves the electron in its lowest energy state. The longest wavelength of light that can be emitted in such a process is called λ a . The next longest wavelength is called λ b . Calculate λ b. b. The first ionization of one atom of Na is 8.233x10-19 J. Use this number to calculate the effective nuclear charge experienced by the highest energy electron in Na. 6. a. Sketch 2 isomers of C 3 H 7 Br. What type of isomer are they? b. Sketch isomers BrClFCH. What type of isomer are they? c. Sketch isomers of C 3 H 6 O. What type of isomer are they? d. Sketch isomers of PtCl 2 (NH3) 2 . What type of isomer are they?...
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