1A_2008_Spring_3_key - CHEMISTRY 1A Spring 2008 EXAM 3 Key...

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1 CHEMISTRY 1A Spring 2008 EXAM 3 Key CHAPTERS 7, 8, 9 & 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 second ionization energy is the energy necessary to remove one mole of electrons from one mole of isolated and gaseous + 1 ions to form one mole of isolated and gaseous + 2 ions. 2. A(n) molecular orbital is a volume that contains a high percentage of the electron charge for an electron in a molecule or a volume within which an electron in a molecule has a high probability of being found. 3. A(n) trans isomer is a structure that has like groups on different carbons (which are linked by a double bond) and on different sides of the double bond. 4. A polar molecule or ion (or a portion of a molecule or polyatomic ion) that is attracted to water is called hydrophilic . 5. Of the two elements lithium, Li, and fluorine, F, fluorine has highest first ionization energy. 6. Of the two ionic bonds, Mg-P (in Mg 3 P 2 ) or Mg-N (in Mg 3 N 2 ), the Mg-P bond has the most covalent character. 7. Of the two ions, Sc 3+ and K + , the K + is larger. 8. Draw a reasonable Lewis structure for each of the following. Identify all formal charges. If the molecule has resonance, draw all the resonance structures and the resonance hybrid. (6 points each) a. Nitric acid, HNO 3 b. Draw Lewis structures for two isomers of 2-butene, CH 3 CHCHCH 3 .
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3 9. Write abbreviated electron configurations for each of the following, Identify each as paramagnetic or diamagnetic, and write the number of unpaired electrons for each. (4 points each) a. Nickel(II) ion, Ni 2+ Abbreviated electron configuration [Ar] 3d 8 Paramagnetic or diamagnetic? paramagnetic Number of unpaired electrons 2 b. Gold atom, Au Abbreviated electron configuration [Xe] 4f 14 5d 10 6s 1 Paramagnetic or diamagnetic? paramagnetic Number of unpaired electrons 1 10. Sucrose, which is a disaccharide composed of glucose and fructose, is white table sugar. Cholesterol is a natural substance that is both essential for the normal operation of the body and a potential cause of health problems. Which compound would you expect to be more soluble in water? Explain why. (4 points) Sucrose
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1A_2008_Spring_3_key - CHEMISTRY 1A Spring 2008 EXAM 3 Key...

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