2011_Spring_3_key - CHEMISTRY 1A Spring 2011 EXAM 3 Key...

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1 CHEMISTRY 1A Spring 2011 EXAM 3 Key CHAPTERS 7, 8, 9 & part 10 You might find the following useful.
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2 For each of the following, write the word, words, or number in each blank that best completes each sentence. (2 points each) 1. The condition of an atom that has at least one of its electrons in orbitals that do not represent the lowest possible potential energy is called a(n) excited state . 2. A(n) antibonding molecular orbital is formed from out-of-phase interaction of two atomic orbitals. This leads to a decrease in negative charge between two nuclei where the atomic orbitals overlap and leads to less  attraction between the negative charge generated by the electrons and the nuclei. 3. Isomers are compounds that have the same molecular formula but different molecular structures. 4. A(n) unsaturated fat is a triglyceride that has one or more carbon carbon double bonds. 5. Hydrogenation is a process by which hydrogen is added to an unsaturated triglyceride to convert double bonds to single bonds. This can be done by combining the unsaturated triglyceride with hydrogen gas and a platinum catalyst. 6. A polar molecule or ion (or a portion of a molecule or polyatomic ion) that is attracted to water is called hydrophilic . 7. Of the two ionic bonds, Al-S (in Al 2 S 3 ) or Cs-S (in Cs 2 S), the Al-S bond has the most covalent character. 8. Of the two ions, S  and Ca  , the S  is larger.
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3 9. There are disagreements among chemists as to how Lewis structures should be drawn. Some feel that we should try to minimized formal charges, others feel we should emphasize the “octet rule”, and others feel that for most of the uses for Lewis structures, it doesn’t make any difference. As an example, consider the prediction of the molecular
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2011_Spring_3_key - CHEMISTRY 1A Spring 2011 EXAM 3 Key...

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