Sample questions for exam 2

Sample questions for exam 2 - 1 WARNING: The selection of...

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1 WARNING: The selection of topics is not exhaustive. Selected sample questions for Exam 2. Make sure you review your quizzes, notes, and assigned problems. 1. Draw ONE Lewis structure for each of the following molecules and assign oxidation numbers for the underlined atom : Lewis structure Oxidation number P O 4 3- ________ P O 3 3- ________ Br O 3 -1 ________ 2. (a) For the following molecules, draw Lewis structures and fill in the blanks below based on the structure you drew. (i) SeOCl 2 (ii) XeF 2 (Se is the central atom) (Xe is the central atom) Lewis Dot Structure Geometry of lone pairs and bond pairs about the central atom ____________ ____________ Molecular shape ____________ ___________ Hybridization of the central atom ____________ ____________
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2 3. (a) Draw an acceptable Lewis structure (including resonance structures) for [OCN] -1 . Assign formal charges to the atoms in your structures, and place a circle around the formal charges. Circle the resonance structure that you would not expect to be a major contributor to the electronic structure of [OCN] -1 . (b) On the basis of the resonance structures you drew above, would you expect the C-N bond order to be higher in [OCN] -1 or [SCN] -1 ? Explain your choice. Circle one: [OCN] -1 [SCN] -1 Explain: 4. Given a cubic closed packed array of oxide ions with a radius of 1.26 Å , circle the best cation for filling tetrahedral holes. (a) Be 2+ 0.50 Å (b) Mg 2+ 0.86 Å (c) Ba 2+ 1.52 Å Circle the best cation for filling octahedral holes in this O 2- lattice.
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Sample questions for exam 2 - 1 WARNING: The selection of...

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