1999_116_final - Page 1 GENERAL CHEMISTRY 116 FINAL EXAM...

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Page 1 GENERAL CHEMISTRY 116 FINAL EXAM 1999 NAME ___________________________ SECTION_______________ ANSWER ALL QUESTIONS ON THESE SHEETS. SHOW ALL WORK FOR NON-MULTIPLE CHOICE PROBLEMS. NO WORK = NO CREDIT. THERE IS NO PARTIAL CREDIT FOR MULTIPLE CHOICE PROBLEMS. TOTAL POINTS 200. 1. Why does ozone not form in high concentrations in the atmosphere above 50 km? (3 pts) a) insufficient oxygen is available b) insufficient molecules exist for removal of excess energy from ozone upon its formation c) light of the required wavelength is not available at those altitudes d) atomic oxygen concentration is too low at high altitudes 2. Why are chlorofluorocarbons so damaging to the ozone layer when they are such stable molecules? (3 pts) a) they contain a double bond that ozone readily attacks, resulting in the destruction of the ozone b) they are very light molecules that rapidly diffuse into the upper atmosphere and block the radiation that causes formation of ozone c) they are greenhouse gases that raise the temperature above the dissociation temperature of ozone d) the radiation in the stratosphere dissociates them producing chlorine atoms that catalytically destroy ozone 3. Natural, unpolluted rainwater is typically acidic. What is the source of this natural acidity? (3 pts) a) CO b) SO c) NO d) HCl e) chlorofluorocarbons 4. Which element found in fossil fuels is primarily responsible for acid rain? (3 pts) a) sulfur b) carbon c) hydrogen d) phosphorus 5. Which one of the following is always positive when a spontaneous process occurs? (3 pts) a) S s y s t e m b) S s u r r o u n d i n g s c) S u n i v e r s e d) H u n i v e r s e 6. Which of the following processes causes an entropy decrease? (3 pts) a) boiling water to form steam b) dissolution of solid KCl in water c) mixing of two gases into one container d) freezing water to form ice
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Page 2 GENERAL CHEMISTRY 116 FINAL EXAM 1999 7. Calculate S, for the reaction below at 25 C. (5 pts) 4Al ( s ) + 3O ( g ) 2Al O ( s ) S u b s t a n c e S ( J / m o l K ) Al ( s ) 164 Al O ( s ) 51.0 O ( g ) 205 8. Consider the following table of thermodynamic data. All values are tabulated for 25 C. Substance
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This note was uploaded on 05/14/2008 for the course CHEM 161, 116 taught by Professor Sheirdon during the Spring '08 term at Rutgers.

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1999_116_final - Page 1 GENERAL CHEMISTRY 116 FINAL EXAM...

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