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Unformatted text preview: el56 Exam01 Walker (53970) 1 This print-out should have 20 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. Read all options before choosing one. There may be cases in which more than one response appears to be true. PICK THE RESPONSE that BEST answers the question asked. 001 10.0 points Which process does NOT involve a chemical change? 1. digesting food 2. boiling water correct 3. cleaning the shower with Lime Away 4. burning charcoal on the grill Explanation: Combustion and digestion are chemical changes; the initial substances are no longer present afterward. Lime Away reacts with lime and releases bubbles of gas; the lime is not present afterward. Boiling water just changes H 2 O from a liquid to a gas. 002 10.0 points What is the LEAST variable substance in the atmosphere? 1. CO 2 2. oxygen correct 3. SO 2 4. H 2 O Explanation: Humidity varies from place to place, as does pollution. Luckily, though, the percent oxy- gen in the air does not vary widely, except perhaps on Mt. Everest. 003 10.0 points The dominant source of SO x is 1. lawnmowers. 2. coal burning power plants. correct 3. diesel locomotives. 4. automobiles. 5. oil fired power plants. Explanation: 004 10.0 points Catalytic converters reduce the amount of what compound in the car exhaust? 1. SO 2 2. O 3 3. CO 2 4. CO correct Explanation: Catalytic converters remove some of the CO, NO x and unburned hydrocarbons in car exhaust and convert them into CO 2 , N 2 , O 2 , and H 2 O. 005 10.0 points Which is the highest concentration? 1. 5630 ppb 2. 17 ppm 3. 0.005% correct 4. 0.000027% 5. 3 10- 6 % Explanation: 006 10.0 points What is the proper measurement of the vol- ume represented? el56 Exam01 Walker (53970) 2 12 13 14 15 16 1. 13 mL 2. 13.40 mL 3. 13.400 mL 4. 13.4 mL correct Explanation: The scale is in units of 1, so tenths is the...
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This note was uploaded on 05/05/2008 for the course CH 304k taught by Professor Walker during the Spring '08 term at University of Texas at Austin.
- Spring '08