Exam 4a chem 102 F10

Exam 4a chem 102 F10 - 1. For the elements Cs, F, and Cl,...

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1. For the elements Cs, F, and Cl, the order of increasing electronegativity is: A) F < Cl < Cs B) Cs < Cl < F C) Cl < Cs < F D) F < Cs < Cl E) none of these 2. As the number of bonds between two carbon atoms increases, which one of the following decreases? A) number of electrons between the carbon atoms B) bond energy C) bond length D) all of these E) none of these Page 1
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3. Using the following data reactions: H ° (kJ) H 2 ( g ) + Br 2 ( g ) → 2HBr( g ) –103 H 2 ( g ) → 2H( g ) 432 Br 2 ( g ) → 2Br( g ) 193 calculate the energy of an H-Br bond. A) 728 kJ B) 261 kJ C) 522 kJ D) 52 kJ E) 364 kJ 4. Which has the greater N–O bond length, NO 2 or NO 3 ? A) NO 2 B) NO 3 C) The bond lengths are the same. D) More information is needed. E) None of these (A-D). Page 2
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5. Choose the electron dot formula that most accurately describes the bonding in CS 2 . (Hint: Consider formal charges.) A) S C S B) C S S C) S C S D) S C S E) S C S 6. Select the molecule from the following that has a dipole moment.
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This note was uploaded on 02/04/2011 for the course CHEM 102 taught by Professor Peterpastos during the Fall '08 term at CUNY Hunter.

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Exam 4a chem 102 F10 - 1. For the elements Cs, F, and Cl,...

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