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homework_3 - Grodin Micah Homework 3 Due 11:00 pm Inst Sara...

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Grodin, Micah – Homework 3 – Due: Sep 27 2005, 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 Lead pollution in air has dropped dramati- cally over the past 20 years because 1. less expensive octane enhancers have been found, eliminating the need for leaded gaso- line. 2. coal and oil used in electrical power plants have been pre-treated to remove lead before combustion. 3. strict new regulations required all lead to be eliminated from paint in general, and painted pencils in particular. 4. it poisons catalytic converters, rendering them inactive; consequently, leaded gasoline was taken off the market. 5. catalytic converters include catalysts to convert lead into a harmless form. 002 (part 1 of 1) 10 points A sample of air is analyzed and found to contain 0.000200 g of particulate matter in 40.0 m 3 of air.
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