Exam 3 Form A Key fall 07CHEM103A Dr. Keller

Exam 3 Form A Key fall 07CHEM103A Dr. Keller - Chemistry...

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Chemistry 103A Exam 3, Form A Answer Key 1. (2) The charge of the most stable ion formed by iodine (I) is (a) +3 (b) -1 (c) +5 (d) -2 (e) none of these 2. (2) Which molecule will have a dipole moment? (a) CH 4 (b) Br 2 (c) BF 3 (d) H 2 O (e) CO 2 N C C H C H O H H O H H H 3. (2) A Lewis structure is shown above. The formal charge of the nitrogen atom is (a) -2 (b) -1 (c) 0 (d) +1 (e) +2 4. (2) In the Lewis structure above the OCO angle is (a) 120 degrees (b) 90 degrees (c) 180 degrees (d) 109.5 degrees (e) 60 degrees 5. (2) In the Lewis structure above the charge of the whole molecule is (a) -2 (b) -1 (c) 0 (d) +1 (e) +2 6. (2) Atom with the highest electronegativity (a) Cl (b) Br (c) P (d) Bi (e) Ga 7. (2) Electronegativity is (a) The energy needed to remove the loosest electron from an atom. (b) The maximum positive charge the atom can acquire. (c) The energy released when an atom picks up an electron. (d) The maximum negative charge an atom can acquire. (e) The power of an atom in a molecule to attract electrons to itself.
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8. (2) What is the average kinetic energy of a methane molecule (CH 4 ) at 78 o C (351 K)? Boltzmann s constant is 1.38e-23 J/K. A methane molecule weighs 2.66e-26 kg.
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This test prep was uploaded on 04/14/2008 for the course CHEM 103a taught by Professor Weso during the Fall '08 term at University of Arizona- Tucson.

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Exam 3 Form A Key fall 07CHEM103A Dr. Keller - Chemistry...

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