6APracfinal05

6APracfinal05 - Chem 6A Practice Final(for the new book and...

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Chem 6A Practice Final (for the new book and outline) Below you will find a practice final for Chem A. The questions are similar to those you might expect to see on the real exam. The test below may be a little longer than the real thing, but there is no guarantee that it is longer or shorter; nor do I promise that all subject areas I will test you on are represented below . Take this practice exam as if it was a real exam, including time and contioions. Good Luck
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1. Chromium metal crystallizes as a body-centered cubic lattice. If the atomic radius of Cr is 1.25 angstroms, what is the density of Cr metal in g/cm 3 ? a) 5.52 b) 7.18 c) 7.81 d) 2.76 e) 3.59 2. A metal crystallizes with a face-centered cubic lattice. The edge of the unit cell is 4.08 angstroms. The diameter of the metal atom in angstroms is: a) 1.44 b) 2.04 c) 2.88 d) 4.08 e) none of these 3. (3 PTS ) On a relative basis, the weaker the intermolecular forces in a substance: a) the greater its heat of vaporization. b) the more it deviates from ideal gas behavior. c) the greater is its vapor pressure at a particular temperature. d) the higher is its melting point. e) none of these. 4. (3 PTS ) The boiling point for some of the first row hydrides (e.g., ammonia) is greater than expected compared to the second row hydrides because of a) molar mass b) covalent bonding. c) atomic orbital overlap. d) hydrogen bonding. e) ionic size. 5. Select the polar molecule among the following. a) CO 2 b) SeO 3 c) XeF d) SF 4 e) BeCl 2 6. Which of the following molecules has no dipole moment? a) CO 2 b) NH 3 c) H 2 O d) all e) none 7. Which of the following molecules has a nonlinear structure? a) XeF 4 b) BeCl 2 c) O 3 d) CO 2 e) N 2 O (central atom is N) 8. The geometry of AsCl 5 is: a) trigonal bipyramidal. b) square pyramidal. c) distorted tetrahedral. d) octahedral. e) none of these. 9. In the molecule XeF 2 , how many pairs of electrons surround Xe and what is the molecular geometry? a) 4, bent b) 4, pyramidal c) 5, linear d) 5, bent e) 6, linear
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10. Which of the following is NOT assumed in the VSEPR theory? a) Lone pair electrons exert a stronger repulsive effect on adjacent electron pairs than do bonding pairs. b) Multiple bonds do not affect the gross stereochemistry of the molecule. c) Electron pairs in the valence shell of an atom are arranged around that atom in such a way as to minimize the repulsion. d) The core electrons do not influence the shape of the molecule.
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6APracfinal05 - Chem 6A Practice Final(for the new book and...

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