Quiz1 - the number, 0 . 7887 rounds to 0 . 789 with a std....

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Version 079/ABADD – Quiz 1 – Lyon – (53385) 1 This print-out should have 4 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. Please check your bubble answer sheet to be sure you have correctly bubbled your name, EID and quiz version number. 001 10.0 points The density average For three measurements oF ethanol (a pure substance, not a mixture) was determined to be 0 . 7887 ± 0 . 002384 g/mL at 25 . 0 C. Which oF the Following is the correct choice For recording the density oF ethanol? 1. 0 . 789 ± 0 . 002 g/mL correct 2. 0 . 790 ± 0 . 002 g/mL 3. 0 . 788 ± 0 . 002 g/mL 4. 0 . 7887 ± 0 . 002 g/mL 5. 0 . 789 ± 0 . 0023 g/mL Explanation: 0 . 788 7 ± 0 . 002 384 = 0 . 789 ± 0 . 002 g / mL The frst whole number in the standard deviation determines how many sig. fgs. the answer will have. The frst number in the std. deviation is 0.002; this tells us that the variability occurs at the thousandths place in the average oF the measurements. This means
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Unformatted text preview: the number, 0 . 7887 rounds to 0 . 789 with a std. deviation oF ± . 002 (the measurement average can only be as precise as the std. deviation will allow). 002 10.0 points Which oF the Following is an extensive prop-erty oF matter? 1. density 2. melting point 3. weight correct 4. color 5. specifc gravity Explanation: 003 10.0 points What is the volume oF a 2 . 50-gram block oF metal whose density is 6 . 72 grams per cubic centimeter? 1. 16 . 8 cm 3 2. 2 . 69 cm 3 3. 1 . 60 cm 3 4. . 372 cm 3 correct 5. . 0595 cm 3 Explanation: 004 10.0 points Round o± 32 , 175 , 000 μm to two signifcant fgures. 1. 3 . 2 × 10 7 μ m correct 2. 3 . 2 μ m 3. 3 . 2 × 10 5 μ m 4. 3 . 2 × 10 6 μ m 5. 3 . 2 × 10 8 μ m Explanation: 32 , 175 , 000 μ m = 3 . 2 × 10 7 μ m...
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This note was uploaded on 10/21/2009 for the course CH 53395 taught by Professor Lyon during the Spring '09 term at University of Texas at Austin.

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