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CHEM 341 Workshop Questions Week 1 IUPUI

CHEM 341 Workshop Questions Week 1 IUPUI - specify any...

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Name______________________________ C341 Workshop Section____________________ August 26/27, 2010 Workshop 1 Questions Purpose : “Function follows form” is a fundamental principle that enables us to understand the physical and chemical properties of atoms & molecules. In this workshop, we will focus on the electronic structure of atoms. In particular, we will discuss the valance electron configuration, Lewis structures, electronic orbitals, bonding types, and resonance. 1. Write Lewis structures and condensed structures for the following molecules. Describe the types of bonds in each molecule. a. hydrazine, N 2 H 4 b. phosgene, COCl 2 c. nitrous acid, HNO 2 2. The H 2 O molecule has a bond angle of 105 o . a. What type of atomic orbitals does oxygen use to form the two equivalent σ bonds with H? b. Why is this bond angle less than 109.5 o ? 3. For each of the following molecules, give σ , π descriptions of the bonding that correspond to the observed structural information. Be sure to accommodate all of the bonding and nonbonding valence electrons and to
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Unformatted text preview: specify any formal charges. Label the hybridization at the relevant atoms. a. Acetone, CH 3 COCH 3 C-H = 109 pm Angle CCC = 116 o Atoms C,C,C, and O are in the same plane b. 1-bromo-2-deuterioethylene, DHCCHBr All atoms are in the same plane. Two isomers are known. c. dimethyl sulfoxide (DMSO), (CH 3 ) 2 SO Angle CSO = 107 o Angle CSC = 97 o The dihedral angle defined by the CSC plane and the S-O bond = 116 o 4. Draw complete condensed Lewis structures of reactants and products, using lines for bonding and showing nonbonding electron pairs. Identify the Lewis acid and the Lewis base for each reaction. Use curved arrows to show the bond-making ad bond-breaking processes for the forward and reverse reactions. Explain the origins of the formal charges in the products. a. CH 3 SCH 3 + BF 3 (CH 3 ) 2 S +- B-F 3 b. CH 3 SH + CH 3 O-CH 3 S-+ CH 3 OH c. H 3 N + CH 3 Br H 3 N +-CH 3 + Br-...
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