Exam 3 Sample Problems

Exam 3 Sample Problems - Possible questions S08 CHEM 151 Do...

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Possible questions S08 CHEM 151 Do simple oxidation numbers from Lewis structures. (2) According to VSEPR theory, a molecule with the general formula AX 2 E 2 will have a _____ structure (a) linear (b) pyramid (c) tetrahedral (d) bent (e) twisted 1. (2) Which molecule violates the octet rule? 2. (2) Electronegativity is 3. (2) In the molecule below, the <HCC angle is C C C H H H F F F 4. (2) Which molecule is not polar ? (a) CO (b) SO 2 (c) SO 3 (d) SO (e) NO 5 6. (2) This question deals with the bond angles in dinitrogen tetroxide. The Lewis structure is shown below. What is the NNO angle? N N O O O O
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4) What is the MOLECULAR GEOMETRY ( SHAPE ) for PH 3 ? 5) For a transition metal Fe 2+ ion the configuration [Ar]4s 0 3d 6 is an : 7) Which of the following covalent BONDS is least polar? (this is not a trick question) Pauling Electronegativities F = 4.0 P = 2.1 Cl= 3.0 H = 2.1 A) F―Cl B) Cl―P C) P―H D) F―H Cl―H 8) Water is critical to life on earth and has many unusual properties (solid floats on liquid, exceedingly high boiling point, etc.). Many of these are related to: A) Ionic forces between charged molecules B) Macromolecular combinations increase bonding C) Vander waals (dispersion) forces between polar bonds D) Hydrogen bonding E) Ordinary dipole-dipole forces 9) A material is hard, crystalline, not conducting at room temperature, but conducts electricity when melted. It probably is: 10) Which of the following general classes of organic compounds could form hydrogen bonds with itself? ( hint : draw out the structures) I organic acids -COOH II amines -C-NH 2 III ethers -C-O-C ________________________________________________________________________________ 11) (6 points) Including where appropriate electron pairs; brackets; double headed arrows and charges draw all the best resonance structures for CO 3 2-
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13)(15pts) Based on their geometry and bond polarity identify each of the following molecules as POLAR or NON-POLAR: You MUST draw the structures and SHOW the arrows separately for the polar bonds used to reach your conclusions. Show in your drawing or in words how the arrows add or cancel. Pauling Electronegativites Ge = 1.8 F= 4.0 Cl= 3.0 C =2.4 H = 2.1 5pts GeF 2 circle POLAR or NON-POLAR 5 pts ClF 3 circle POLAR or NON-POLAR 5pts cis C 2 H 2 F 2 Circle POLAR or NON-POLAR 14)(18pts) From the following list of forces identify the strongest force holding together the following liquids/solids:
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