CH. 1 - MEASUREMENT Unit Conversions.

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Presentation transcript:

CH. 1 - MEASUREMENT Unit Conversions

A. SI Prefix Conversions 1. Find the difference between the exponents of the two prefixes. 2. Move the decimal that many places. To the left or right?

A. SI Prefix Conversions Symbol Factor mega- M 106 kilo- k 103 BASE UNIT --- 100 deci- d 10-1 move left move right centi- c 10-2 milli- m 10-3 micro-  10-6 nano- n 10-9 pico- p 10-12

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

A. SI Prefix Conversions 0.2 1) 20 cm = ______________ m 2) 0.032 L = ______________ mL 3) 45 m = ______________ nm 4) 805 dm = ______________ km H.O. 32 45,000 0.0805

B. Dimensional Analysis The “Factor-Label” Method Units, or “labels” are canceled, or “factored” out, in chem it’s called DA.

B. Dimensional Analysis Steps: 1. Identify starting & ending units. 2. Line up conversion factors so units cancel. 3. Multiply all top numbers & divide by each bottom number. 4. Check units & answer.

B. Dimensional Analysis Lining up conversion factors: 1 in 2.54 cm 2.54 cm 1 in

B. Dimensional Analysis 1) Your European hairdresser wants to cut your hair 8.0 cm shorter. How many inches will he be cutting off? cm in 8.0 cm 1 in 2.54 cm = 3.1 in or……another way?

B. Dimensional Analysis 2). How many milliliters are in 1.00 quart of milk? qt mL 1.00 qt 1 L 1.06 qt 1E3 mL 1 L = 943 mL ÷ 

B. Dimensional Analysis 3) Taft football needs 550 cm for a 1st down. How many yards is this? cm yd 550 cm 1 in 2.54 cm 1 ft 12 in 1 yd 3 ft = 6.0 yd

B. Dimensional Analysis 4. You have 1.5 pounds of gold. Find its volume in cm3 if the density of gold is 19.3 g/cm3. lb cm3 1.5 lb 1 kg 2.2 lb 1 g 1E-3 kg 1 cm3 19.3 g = 35 cm3

B. Dimensional Analysis 5. How many liters of water would fill a container that measures 75.0 in3? in3 L 75.0 in3 (2.54 cm)3 (1 in)3 1 L 1E2 cm3 = 1.91 L

B. Dimensional Analysis 6) A piece of wire is 1.3 m long. How many 1.5-cm pieces can be cut from this wire? cm pieces 1.3 m 1E2 cm 1 m 1 piece 1.5 cm = 87 pieces

B. Dimensional Analysis 7). Convert 8470 s to s. 8470 s 1E6 s = 8.47 x 109 s 1 s

B. Dimensional Analysis 8. Convert 6.85 nL to mL 6.85 nL 1E3 mL = 6.85 x 10-6 ml 1E9 nL

B. Dimensional Analysis 9. If I was traveling down the interstate at 71 mph (m/h), what would this be in cm/s ? *** BOTH UNITS MUST BE CONVERTED !!