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HW 9-25-08

# HW 9-25-08 - c 10.0500 g d 7000 kg e 7000 kg a 4 b 2 c 6 d...

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Joseph Leonard Green Section 3 review p57 9/25/08 1. The density of copper is listed as 8.94 g/cm³. Two students each make three density determinations of samples of the substance. Student A’s results are 7.3 g/mL, 9.4 g/mL, and 8.3 g/mL. Student B’s results are 8.4 g/cm³, 8.8 g/cm³, and 8.0 g/cm³. Compare the two sets of results in terms of precision and accuracy. Student A’s results are neither accurate nor precise. Student B’s results are precise and somewhat accurate. 2. How many significant figures are there in each of the following measured values? a. 6.002 cm b. 0.0020 m

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Unformatted text preview: c. 10.0500 g d. 7000 kg e. 7000. kg a. 4 b. 2 c. 6 d. 1 or 4 e. 4 3. Round 2.6765 to two significant figures. 2.7 4. Carry out the following calculations. a. 52.23 g + 1.7502 g b. 12 m x 6.41 m c. _16.25 g__ 5.1442 mL a. 53.98 g b. 77 m² c. 3.159 g/mL 5. Perform the following operations. Express each answer in scientific notation. a. (1.54 x 10^-2 g) + (2.86 x 10^-1 g) b. (7.023 x 10^9 g) – (6.62 x 10^7 g) c. (8.99 x 10^-4 m) x (3.57 x 10^4 m) d. _2.17 x 10^-3 g_ 5.022 x 10^4 mL a. 3.014 x 10^-3 g b. 6.69023 x 10^11 g c. 3.2 x 10^1 m² d. 4.3 x 10^-6...
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