worksheets_ch_2.2017 (1) - Honors Chemistry 2017-2018 WS...

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Honors Che mis t ry 2017-2018 WS 1.1 Practicing Significant Figures; Errors of M e a su r eme nt Directions: Following instructions below: I. Determine the number of significant fgures in each of the following numbers: a. 5.432 g b. 40.319 c. 146 cm 3 d. 3.285 cm e. 0.189 lb f. 429.3 g g. 2873.0 cm 3 h. 99.9 ml i. 0.000235 g j. 144 lb k. 2500 cm l. 2500.0 cm m. 1.04 x 10 14 g n. 3.58 x 10 -9 nm o. 48.57193 lb p. 8365.6 g q. 0.002300 mg r. 7.500 x 10 8 oz s. 3.92 x 10 -4 g t. 1.000 x 10 3 lb II. Add and express to the appropriate significant digits, and state fnal units: a. 12 cm + 0.031 cm + 7.969 cm = b. 0.085 cm + 0.062 cm + 0.14 cm = c. 1 g + 3.912 g + 7.0518 g + 0.00013 g = d. 30.5 g + 16.82 g + 41.07 g + 85.219 g = e. 143.0 cm + 298.25 cm + 68.45 cm + 6 cm f. 29.49 cm + 83.46 cm + 107.05 cm + 26.618 cm = g. 0.0653 g + 0.08538 g + 0.07654 g + 0.0432 g = h. 0.0653 g + 0.08538 g + 0.07654 g + 0.0432 g = i. 1.8 x 10 -5 cm + 3.25 x 10 -4 cm + 4.6 x 10 -5 cm = j. 63.489 ml + 126.2 ml + 68.85 ml + 12.05 ml =
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Honors Che mis t ry 2017-2018 III. Subtract and express to the appropriate significant digits, and state fnal units: a. 41.025 cm – 23.28 cm = b. 289 g – 43.7 g = c. 145.63 mL – 28.9 ml = d. 462.47 g – 39.9 g = e. 40.008 ml – 29.0941 ml = IV. Multiply, state fnal units: a. 2.89 cm X 4.01 cm = b. 17.3 cm X 6.2 cm = c. 3.08 m X 1.2 m = d. 5.00 mm X 7.3216 mm = e. 20.8 dm X 123.1 dm = f. 5 cm X 5 cm = g. 5.0 cm X 5 cm = h. 5.0 cm X 5.0 cm = i. 4.8 x 10 2 m X 2.101 10 3 m = j. 9.13 x 10 -4 cm X 1.2 x 10 -3 cm = k. 4.218 cm X 6.5 cm = l. 150.0 m X 4.00 m = m. 282.2 km X 3.0 km = n. 14 x 10 -8 m X 3.25 x 10 -6 m = o. 2.865 x 10 4 m X 1.47 x 10 3 m V. Divide, state fnal units: a. 8.071 cm 2 ÷ 4.216 cm = b. 109.3758 m 2 ÷ 5.813 m = c. 24,789.4 km 2 ÷ 43.5 km = d. 6.058 mm 2 ÷ 0.85 mm = e. 4.819 cm 2 ÷ 9.852 cm = f. 139.482 m 2 ÷68.75 m = g. 4.23 m 2 ÷ 18.941 m = h. 85.621 km 2 ÷ 8.05 km = i. 6.023 10 14 mm 2 ÷ 5.813 10 12 mm = j. 1.142 10 -8 mm 2 ÷ 8.5 10 -4 mm = VI. Express the answers to the following problems using significant fgures, state fnal units: a. 0.057 mL X (760 mm/40 mm) X (273 K/250 K) = b. 142.0 ml X (745 mm/785 mm) X (300.0 K/295 K) = c. 51.3 g X (44.962 amu/115.874 amu) = d. 83.495 g X (172.76 g/260.00 g) = e. 6.025 10 14 cm3 X (20,000.0 mm/142.5 mm) X (273.0 K/315.0 K) = 2
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Honors Che mis t ry 2017-2018 WS 1.2 More Significant Figures 1) List the number of significant digits for each of the following. a. 1 Km b. 1.5 ml c. 2.15000 cm 2 d. 5.380000 s 2) What is the difference between counting and measured numbers? Which are expressed using significant digits? 3) How many significant digits are there in each of the following quantities? a. 20 Kg b. 0.0051 g c. 11 m d. 0.010 s e. 90.4 °C f. 0.004 cm g. 0.089 Kg h. 0.00900 L i. 100.0 °C j. 20 cars 4) Define what we mean by precision and accuracy. 5) How many significant fgures are there in the following measured quantities? a. 1.0370 g b. 0.000417 m c. 0.00309 cm d. 100.1 °C e. 9.0010 L 6) Express each of the following in scientific notation: (assume that any zero digits to the right of the last nonzero digit are not significant fgures.) a. 1250 g b. 13,000,000 m c. 60,230,000,000,000,000,000,000 atoms d. 214,570 mg e. 31.47 g 7) Write the following in decimal notation: a. 3 X 10 10 m b. 2.54 X 10 –5 m c. 122 X 10 -2 d. 3.4 X 10–7 g e. 0.0325 X 10 6 cm 8) Perform the following arithmetic and express the answers in the proper number of significant fgures. Assume the values come from measurements. State fnal units. i. 2.41 cm X 3.2 cm ii. 4.025 m X 18.2 m iii. 81.4 g/104.2 cm 3 iv. 3.476 g - 0.0002 g v. 81.4 g – 0.002 g
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Honors Che mis t ry 2017-2018 9) Perform the following calculations and express your answers in scientific notation rounded to the proper number of significant fgures. Assume all the values come from measurements. State fnal units.
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