Assignment 3 2010 - Is polarity of the molecule indicated...

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2010 Chemistry 2353 Assignment 3 1. (8 pts)Draw Lewis structures to deduce the type of nitrogen-nitrogen bond present in  a) N 2 H 4 ; b) N 2 F 4 ; c) N 2 F 2 ; d) [N 2 H 5 ] +    2. (18 points)Determine the shape of each of the following molecules and state whether each is expected to be polar or  not: a) CO 2 ; b)SO 2 ; c)BF 3 ; d)PF 5 ; e)trans-N 2 F 2 ; f) KrF 2 3. (5 pts)Use VSEPR model to rationalize why SNF is tetrahedral and SF 4  is not. 4. (10 pts)Given the  ionization enthalpies for H and F below, draw an MO energy-level diagram for the HF molecule. 
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Unformatted text preview: Is polarity of the molecule indicated in this diagram? Atom 1 st IE (kJ mol-1 ) 2 nd IE(kJ mol-1 ) 3 rd IE(kJ mol-1 ) 4 th IE(kJ mol-1 ) H 1311 F 1681 3375 6045 8409 5. (5 pts)What are the three important types of hybrid atomic orbitals that can be formed by an atom with only s and p orbitals in its valence shell? Describe/draw the molecular geometry that each of these produces....
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