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Unformatted text preview: Grodin, Micah Homework 6 Due: Mar 7 2006, 11:00 pm Inst: Sara Sutcliffe 1 This print-out should have 15 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points Which is NOT correct regarding fuel cells as energy sources? 1. Depending upon the fuel used they may produce fewer greenhouse gases emissions than those produced by direct combustion. 2. They will likely replace hybrid engines in automobiles in the next 10-15 years or so. 3. They produce no greenhouse gases. 4. They do not emit precursors to acid rain. 5. They are thermodynamically more effi- cient in principle than internal combustion engines running on the same fuels. 002 (part 1 of 1) 10 points Porous carbon electrode containing Ni Porous carbon electrode containing Ni and NiO H 2 O( ) H 2 (g) O 2 (g) Hot KOH solution e- e- How does the reaction of hydrogen and oxy- gen to produce energy in a fuel cell differ from their interaction during the direct combustion of hydrogen and oxygen? 1. It is much easier to control the hydrogen and oxygen during direct combustion than during their reaction in a fuel cell. 2. Muchlessheatenergyisproducedinafuel cell than via direct combustion of hydrogen and oxygen. 3. In the fuel cell, there is an oxidation- reduction reaction between hydrogen and oxygen; in the direct combustion of hydro- gen and oxygen, there is no such reaction....
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This homework help was uploaded on 04/07/2008 for the course CH 304k/305k taught by Professor Sutcliffe during the Fall '05 term at University of Texas at Austin.
- Fall '05