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The SI System of Measurement

The SI System of Measurement. The Nature of Measurement. A Measurement is a quantitative observation consisting of TWO parts. Part 1 - number Part 2 - scale (unit) Examples: 20 grams 6.63 x 10 -34 Joule·seconds. The Fundamental SI Units (le Système International, SI).

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The SI System of Measurement

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  1. The SI System of Measurement

  2. The Nature of Measurement A Measurement is a quantitative observation consisting of TWO parts • Part 1-number • Part 2-scale (unit) • Examples: • 20grams • 6.63 x 10-34Joule·seconds

  3. The Fundamental SI Units(le Système International, SI)

  4. SI PrefixesCommon to Chemistry

  5. Metric Conversions g m L 103 10-1 10-2 10-3 102 101 kilo hecto deka Base unit deci centi milli Conversions in the metric system are merely a matter of moving a decimal point. The “base unit” means the you have a quantity (grams, meters, Liters, etc without a prefix.

  6. Metric Conversions g m L 103 10-1 10-2 10-3 102 101 kilo hecto deka Base unit deci centi milli 1 2 3 18 L 18 liters = 18 000 milliliters Example #1: Convert 18 liters to milliliters

  7. Metric Conversions g m L 103 10-1 10-2 10-3 102 101 kilo hecto deka Base unit deci centi milli 3 2 1 450 mg = 0.450 g 450 mg Example #2: Convert 450 milligrams to grams

  8. Metric Conversions g m L 103 10-1 10-2 10-3 102 101 kilo hecto deka Base unit deci centi milli 2 3 1 4 5 6 20 kg 20 kg = 20 000 000 mg Example #3: Convert 20 kilograms to milligrams

  9. Metric Conversion Practice-Dimensional Analysis Decimal Ladder

  10. DA format Given unit always goes first Given unit new unit new unit = Given unit

  11. Problem #1 Convert 400 mL to Liters L 400 mL 1 .400 L = 1 000 mL = 0.4 L = 4x10-1 L

  12. Problem #2 Convert10 meters to mm mm 10 m 1 000 10 000 mm = 1 m = 1x104 mm

  13. Problem #3 Convert73 grams to kg kg 73 g 1 0.073 kg = 1 000 g = 7.3x10-2 kg

  14. M Convert0.02 kilometers to m m 0.02 km 1 000 m 20 = 1 km = 2x101 m

  15. 4 Convert20 centimeters to m m 20 cm 1 m 0.20 = 100 cm = 2x10-1 m

  16. 2 Convert450 milliliters to dL dL 450 mL 1 4.5 dL = 100 mL

  17. 1 Convert10 kilograms to grams g 10 kg 1 000 10 000 g = 1 kg = 1x104 g

  18. Temperature Change • KoC (-273) • oCK (+273)

  19. Problem #5 • Convert 45oC to K + = 45 oC 273 318K

  20. Problem #6 • Convert K to oC - = 473K 746K 273

  21. Molar Conversions • Mole-the amount of a substance • 1 mol of any substance equals 6.022x1023 particles • atoms • molecules • Take a look at the Periodic Table of Elements • 1 mol of Na is 22.99 g • 1 mol of H20 is 18.02g

  22. Molar Mass • The amount of matter in 1 mole • 10.81 g B in 1 mol B • 58.69 g Ni in 1 mol Ni • ______ g Fe in 1 mol Fe • 12.01 g C in ___ mol C 55.85 1

  23. Problem #7 Convert54g Na to mol Na mol Na 1 54 g Na 2.4 mol Na = g Na 23

  24. Problem #8 6.3 mol Al to g Al 6.3 mol Al 26.98 g Al 170 g Al = 1 mol Al

  25. Problem #10 Convert175 mL to cm3 cm3 1 175 mL 175 cm3 = 1 mL = 1.75x102 cm3

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