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Scientific Measurement

Scientific Measurement. Did you do your homework?. 44 points possible!. The team with the most points at the end of the period wins! The wining team will receive 10 pts extra credit on their assignment sheets. Let’s Play!. Accuracy and Prcesion.

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Scientific Measurement

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  1. Scientific Measurement Did you do your homework?

  2. 44 points possible! • The team with the most points at the end of the period wins! • The wining team will receive 10 pts extra credit on their assignment sheets. Let’s Play!

  3. Accuracy and Prcesion • Describe the accuracy and precision of each student’s measurement, the correct mass is 47.32 g.

  4. Answer • Lissa – inaccurate and imprecise • Lamont - accurate and precise • Leigh - Anne inaccurate and precise Maximum 3 points

  5. Significant Figures • How many in each? • 60s = 1min • 47.70 g of copper • 1 km = 1000m • 25 computers

  6. Answer • Infinite • 4 sig figs • Infinite • Infinite 4 points

  7. Round off to 3 Sig Figs • 98.473 • 0.00076321 cg • 57.048 m • 12.17 oC

  8. Answer • 98.5 • 0.000763 • 57.0 • 12.2 4 points

  9. Sig Fig Rules for Calculations Round of each of the answers correctly. • 8.7 + 15.43 + 19 = 43.13 • 853.2 – 627.443 = 225.757 • 38.742 / 0.421 = 92.023 • 5.4 x 3.21 x 1.871 = 32.431914

  10. Answer • 43 • 225.8 • 92.0 • 32 4 points

  11. Metric Conversions • Make the following conversions • 157 cs = ? s • 42.7 L = ? ml • 261 nm = ? mm • 0.065 km = ? dm • 642 cg = ? Kg • 8.25 x102 cg = ? ng

  12. Answer • 1.57 s • 4.27 x 104 ml • 2.61 x 10-4 mm • 650 dm • 0.00642 kg • 8.25 x 109 ng 6 points

  13. Density Would the density of a person be the same on the surface of Earth and on the surface of the moon? Explain.

  14. Answer • Yes, neither the mass nor volume of the person would change when they went to the moon, so the density (m/v) would remain the same. 5 points

  15. Scientific Notation • Rank these numbers from smallest to largest. • 5.3 x 104 • 57 x 103 • 4.9 x10-2 • 0.0057 • 5.1 x 10-3 • 0.0072 x 102

  16. Answer • e, d, c, f, a, b 3 points

  17. Density • The density of dry air measured at 25 oC is 1.19 x 10-3 g/cm3. What is the volume of 50.0 g of air? D = m / V, so V = m / D V = 50.0 g = 4.20 x 104 1.19 x 10-3 g/cm3 5 points

  18. Density • A tank with volume, 28.6 cm by 73.0 mm by 0.72 m is filled with olive oil. The oil in the tank has a mass of 1.38 x 104 g. What is the density of the olive oil in kilograms per liter?

  19. Answer First find the volume: 28.6 cm x 7.30 cm x 72 cm = 15032.16 cm = 15000 cm3 Second find the density: 1.38 x 104 g / 15000 cm3 = 0.92 g / cm3 = 0.92 kg / L 10 points

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