ch304 exam1 solution - dh2964 Exam01 Walker(53970 This...

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dh2964 – 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. burning charcoal on the grill 4. cleaning the shower with Lime Away 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. SO 2 2. CO 2 3. oxygen correct 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. oil fired power plants. 3. diesel locomotives. 4. coal burning power plants. correct 5. automobiles. Explanation: 004 10.0 points Catalytic converters reduce the amount of what compound in the car exhaust? 1. O 3 2. CO 2 3. CO correct 4. SO 2 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. 17 ppm 2. 5630 ppb 3. 0.000027% 4. 3 × 10 - 6 % 5. 0.005% correct Explanation: 006 10.0 points What is the proper measurement of the vol- ume represented?
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dh2964 – Exam01 – Walker – (53970) 2 24 25 26 27 28 1. 25 mL 2. 25.40 mL 3. 25.4 mL correct 4. 25.400 mL Explanation: The scale is in units of 1, so tenths is the uncertain digit.
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