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MEASUREMENT: Ch. 2

MEASUREMENT: Ch. 2. Using Measurements. I. Units of Measurement. II. Unit Conversions. III. Honors Chem 1. MEASUREMENT: Ch. 2. Unit Conversions. NUMBER. UNIT. A. SI Prefix Conversions. 0.532. 532 m = _______ km. NUMBER. UNIT. a. 20 cm = ______________ m

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MEASUREMENT: Ch. 2

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  1. MEASUREMENT: Ch. 2 Using Measurements I Units of Measurement II Unit Conversions III Honors Chem 1

  2. MEASUREMENT: Ch. 2 Unit Conversions

  3. NUMBER UNIT A. SI Prefix Conversions 0.532 532 m = _______ km NUMBER UNIT

  4. a. 20 cm = ______________ m b. 0.032 L = ______________ mL c. 45 m = ______________ nm d. 805 dm = ______________ km Examples 0.20 32 45,000 0.0805

  5. Metric Mania!

  6. B. Dimensional Analysis • the “Factor-Label” Method • units, or “labels” are canceled, or “factored” out (one on top, one on bottom)

  7. B. Dimensional Analysis • Steps: • 1. Identify start & end units • 2. Line up conversion factors so units cancel • 3. Multiply all top numbers & divide by each bottom number

  8. qt mL  Example #1 • How many mL are in 1.00 quart of milk (1.057 qt = 1 L)? 1 L 1.057 qt 1000 mL 1 L 1.00 qt = 946 mL

  9. lb cm3 Example #2 • You have 1.5 lbs of gold. Find its volume in cm3 if the density of gold is 19.3 g/cm3. (1 kg = 2.2 lb) 1 cm3 19.3 g 1 kg 2.2 lb 1000 g 1 kg 1.5 lb = 35 cm3

  10. mm in Example #3 • Your European hairdresser wants to cut 80. mm off your hair. How many inches will he be cutting off? (2.54 cm = 1 in) 1 cm 10 mm 1 in 2.54 cm 80. mm = 3.1 in

  11. cm yd Example #4 • Karns football needs 550 cm for a 1st down. How many yards is this? (2.54 cm = 1 in) 1 ft 12 in 1 yd 3 ft 1 in 2.54 cm 550 cm = 6.0 yd

  12. m pieces Example #5 • A piece of wire is 1.3 m long. How many 1.5-cm pieces can be cut from this wire? 1 piece 1.5 cm 100 cm 1 m 1.3 m = 86 pieces

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