MEASUREMENT Ch 2 I Using Measurements II Units

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

MEASUREMENT: Ch. 2 Unit Conversions

A. SI Prefix Conversions 532 m NUMBER UNIT 0. 532 km = _______ NUMBER UNIT

Examples a. 20 cm = 0. 20 _______ m b. 0. 032 L = 32 _______ m. L c. 45 m = 45, 000 _______ nm d. 805 dm = 0. 0805 _______ km

Metric Mania!

B. Dimensional Analysis ² the “Factor-Label” Method w units, or “labels” are canceled, or “factored” out (one on top, one on bottom)

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

Example #1 ² How many m. L are in 1. 00 quart of milk (1. 057 qt = 1 L)? qt m. L 1. 00 qt 1 L 1000 m. L 1. 057 qt 1 L = 946 m. L

Example #2 ² You have 1. 5 lbs of gold. Find its volume in cm 3 if the density of gold is 19. 3 g/cm 3. (1 kg = 2. 2 lb) lb cm 3 1. 5 lb 1 kg 1000 g 1 cm 3 2. 2 lb 1 kg 19. 3 g = 35 cm 3

Example #3 ² Your European hairdresser wants to cut 80. mm off your hair. How many inches will he be cutting off? (2. 54 cm = 1 in) mm 80. mm in 1 cm 1 in 10 mm 2. 54 cm = 3. 1 in

Example #4 ² Karns football needs 550 cm for a 1 st down. How many yards is this? (2. 54 cm = 1 in) cm 550 cm yd 1 in 1 ft 1 yd 2. 54 cm 12 in 3 ft = 6. 0 yd

Example #5 ² A piece of wire is 1. 3 m long. How many 1. 5 -cm pieces can be cut from this wire? m pieces 1. 3 m 100 cm 1 m 1 piece 1. 5 cm = 86 pieces