Finals2 - Part I: Multiple Choice, Concepts (4 points each)...

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2 Part I: Multiple Choice, Concepts (4 points each) Select the best answer and enter your choice on the cover sheet – No partial credit 1. Which of the following would be INCORRECT for molecules or atoms in which there are an odd number of electrons total? a. They are called free radicals. b. In the lewis formula they may have one less electron than octet on C,N,O,F. c. The best resonance form is the one in which the formal change is lowest even if it has to go over octet on C,N,O,F. d. The odd number of electrons makes the molecule very unstable, because they need either one more or one less electron. e. Resonance can have a stabilizing effect on free radicals just as it does on ions. 2. Which of the following is NOT TRUE for resonance structures. a. In resonance forms only the electrons are moved never the atoms. b. Some molecules with no net charge can have resonance forms. c. In some resonance forms the octet rule is expanded. d. In some extreme cases the sum of all the formal charges in the different resonance forms are different. e. Resonance is used to help explain relative stability of molecules or ions. 3. Which of the following would be INCORRECT for lewis formulas: a. There are two different ways in which electrons are counted on each atom in lewis formulas. b. The formal charge assumes that the electrons in bonds are shared equally between the two atoms involved. c. The net formal charge must be equal to the charge on the compound/ion.
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This note was uploaded on 04/10/2010 for the course CHE 2a taught by Professor Tingguo during the Winter '08 term at UC Davis.

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Finals2 - Part I: Multiple Choice, Concepts (4 points each)...

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