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Unit 1-3 SI units

Unit 1-3 SI units. Do now: read chapter 1.6. How much does it cost?. UNITS MATTER!!. 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 seconds.

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Unit 1-3 SI units

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  1. Unit 1-3 SI units • Do now: read chapter 1.6

  2. How much does it cost? • UNITS MATTER!!

  3. 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 10-34seconds

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

  5. The three major temperature scales. TK = TC + 273.15 TC = TK – 273.15

  6. Temperature scales • Celsius scale • based on freezing and boiling points of water (0 oC – 100 oC) • Kelvin scale • based on absolute zero (0 K) temperature at which particles are at lowest possible energy • NO negative numbers

  7. K = oC + 273 oC = K – 273

  8. Converting Between Celsius & Fahrenheit • TC = (TF – 32)X 5/9 • TF = TC x 9/5 + 32 • You don’t need to memorize the conversion between TCand TF

  9. SI Prefixes Common to Chemistry

  10. SI Prefixes

  11. mega- tera- hecto- deka- giga- kilo- M G k h T da 1012 106 102 101 109 103 deci- d 10-1 centi- c 10-2 milli- m 10-3 micro-  10-6 BASE UNIT --- 100 pico- nano- p n 10-9 10-12 SI Prefix Conversions Prefix Symbol Factor Decimal move left Decimal move right

  12. Prefix conversion g m L 103 10-1 10-2 10-3 102 101 kilo hecto deka Base unit deci centi milli Conversions between prefixes 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.

  13. 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

  14. 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

  15. 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

  16. Derived SI units • Volume= (length)3 • SI unit of V: m3 • Commonly used units of V: • Liter(L)= dm3 • Milliliter(ml)=cm3

  17. SI Prefix Conversions-concept check a. cm to m b. m3 to L c. ns to s d. kg to g

  18. SI Prefix Conversions-concept check 20 cm = ______________ m 2) 0.032 L = ______________ mL 3) 45 m = ______________ m

  19. Homework • Handout • Due next class.

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