Arithmetic with units - factors 5. check the result: does...

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Arithmetic with units addition and subtraction: units don't change 2 kg + 3 kg = 5 kg 412 m - 12 m = 400 m o consequence: units must be the same before adding or subtracting! 3.001 kg + 112 g = 3.001 kg + 0.112 kg = 3.113 kg 4.314 Gm - 2 Mm = 4.314 Gm - 0.002 Gm = 4.312 Gm 3 m × 3 m = 9 m 2 10 kg × 9.8 m/s 2 = 98 kg m/s 2 o consequence: units may cancel 5 g / 10 g = 0.5 (no units!) 10.00 m/s × 39.37 in/m = 393.7 in/s Converting Units 5 step plan for converting units 1. identify the unknown, including units 2. choose a starting point 3. list the connecting conversion factors 4. multiply starting measurement by conversion
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Unformatted text preview: factors 5. check the result: does the answer make sense? Common variations 1. series of conversions example: Americium (Am) is extremely toxic; 0.02 micrograms is the allowable body burden in bone. How many ounces of Am is this? 2. converting powers of units 3. converting compound units 4. starting point must be constructed using derived units as conversion factors 1. mass fractions (percent, ppt, ppm) convert mass of sample into mass of component 2. density converts mass of a substance to volume 3. velocity converts distance traveled to time required 4. concentration converts volume of solution to mass of solute...
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This note was uploaded on 11/22/2011 for the course CHEMISTRY CHM1025 taught by Professor Laurachoudry during the Fall '10 term at Broward College.

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