Russuak final key

Russuak final key - Chem 1C Russak Final Key 8 June 2011...

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Chem 1C Russak Final Key 8 June 2011 You will lose 10 % if you do not fill your perm number correctly, forget to bubble the test form, or forget to put your name on the Scantron. There is only 1 correct answer for each question, marking more than one answer will cause you to get that question wrong. There are no penalties for guessing, so you should fill in an answer even if you don’t know it.
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Chem 1C Russak Final Key 8 June 2011 1. Which of the following contains ionic bonding? A. CO B. SrF 2 C. Al D. OCl 2 E. HCl 2. Acetone can be easily converted to isopropyl alcohol by addition of hydrogen to the carbon-oxygen double bond. Calculate the enthalpy of reaction using the bond energies given. A. -484 kJ B. -366 kJ C. -48 kJ D. +48 kJ E. +366 kJ I think the equation I put on the board confused most of you. It is bonds broken-bonds formed, so C is technically the correct answer….but most of the class chose D so I’ll give it to you. 3. Combustion of a fat will release more energy than combustion of an equal mass of carbohydrate because A. fats contain more bonds to oxygen than carbohydrates. B. fats contain fewer bonds to oxygen than carbohydrates. C. the total energy of the carbon-carbon and carbon-hydrogen bonds in fats is greater than the energy content of the carbon-oxygen and oxygen-hydrogen bonds in the reaction products (carbon dioxide and water). D. the total energy of the carbon-carbon and carbon-hydrogen bonds in fats is greater than the energy content of the bonds in carbohydrates. E. fats have higher molar masses than carbohydrates. 4. Select the most polar bond amongst the following. A. C O B. Si F C. Cl F D. C F E. C I
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Chem 1C Russak Final Key 8 June 2011 5. Hydrazine, N 2 H 4 , is a good reducing agent that has been used as a component in rocket fuels. Select the BEST Lewis structure. A. B. C. D. E. None of these choices is correct. 6. Select the correct Lewis structure for nitrogen trifluoride, NF 3 . A. B. C. D. E.
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Chem 1C Russak Final Key 8 June 2011 7. Select the correct Lewis structure for NOCl, a reactive material used as an ionizing solvent. A. B. C. D. E. None of these choices is correct. 8. Which one of the following molecules contains a double bond? A. N 2 B. PCl 5 C. CH 2 O D. C 2 H 2 E. I 2 9. How many resonance structures are possible for NO 3 ¯ ? A. 1 B. 2 C. 3 D. 4 E. 5 10. In the following Lewis structure for ClO 3 F, chlorine has a formal charge of ____ and an oxidation number of ____. A. 7, 7 B. 7, -1 C. 1, 1 D. 1, -1 E. 1, 7
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Chem 1C Russak Final Key 8 June 2011 11. What is the molecular shape of XeO 2 F 2 as predicted by the VSEPR theory? A. square planar B. tetrahedral C. square pyramidal D. see-saw E. octahedral 12. Predict the ideal bond angles in GeCl 4 using the molecular shape given by the VSEPR theory. A.
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Russuak final key - Chem 1C Russak Final Key 8 June 2011...

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