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quiz 1 ch 204 - Version 238/ADCDC Quiz 1 Lyon(52635 This...

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Version 238/ADCDC – Quiz 1 – Lyon – (52635) 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. There is only one try for each question - no retries for answers on this quiz. Therefore, there is no penalty for guessing this time. The answer key will be available on Saturday, 2/13, at 8AM. The scores can be seen on Friday, 2/12, at 8AM. 001 10.0 points Round off 0 . 04721 m to two significant figures. 1. 0 . 05 m 2. 0 . 047 m correct 3. 0 . 0471 m 4. 0 . 04721 m 5. 0 . 0472 m Explanation: 0 . 047 21 m = 0 . 047 m or 4 . 7 × 10 2 μ m 002 10.0 points The density average for three measurements of a sample of olive oil was determined to be 0 . 92362 ± 0 . 0026431 g/mL at 25 . 0 C. Which of the following is the correct choice for record- ing the density of ethanol? 1. 0 . 924 ± 0 . 003 g/mL correct 2. 0 . 92 ± 0 . 003 g/mL 3. 0 . 9236 ± 0 . 0026 g/mL 4. 0 . 924 ± 0 . 0026 g/mL 5. 0 . 924 ± 0 . 002 g/mL Explanation: 003 10.0 points A metal cube of copper has a mass of 48 . 5 grams and is dropped into a graduated cylin- der containing 20 . 00 mL of water. This causes
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