# lect03 - Lecture3Units,Periodicity Length...

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Lecture 3 - Units, Periodicity

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Length SI unit is the  metre (m) will also use  mm, cm,  μ m, nm, pm
Mass SI unit is the kilogram (kg) also will use gram (g) milligram (mg)

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Time SI unit is the second (s) will also use millisecond (ms)
Temperature SI unit is the Kelvin (K) will often use degrees Celcius ( o C) K = o C + 273.15

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Temperature 25 o C = 298 K (“standard temperature”) 100 o C = 373 K 0 K = -273 o C (“absolute zero”)
Amount of Substance SI unit is the mole (mol) common uses include nanomoles (nmol), micromoles ( μ mol), etc.

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Derived Units Area m 2 Volume m 3 , cm 3 (mL) Density kg/m 3 g/mL (kg m -3 ) (g mL -1 )
Significant Figures 38.6 s (3 sig. figs.) 0.00386 s (3 sig. figs) 3.8600 s (3-5 sig figs) better to use scientific notation, e.g. 0.00386 = 3.86 x 10 -3

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Significant Figures (multiplying and dividing) 2.5 doughnuts x 955 MJ/doughnut = ? MJ 2.5 x 955 = 2,387.5 thus, answer is 2,400 MJ (2-4 sig figs!) better yet, 2.4x10 3 MJ (2 sig figs.)
Significant Figures (adding and subtracting) 1.6 beer + 2.31 beers = ? beers 1.6 + 2.31 = 3.91 thus, answer is 3.9 beers (one digit to right of decimal)

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Using Units What mass of water is in this room?
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## This note was uploaded on 03/02/2010 for the course CHEM CHEM 1000 taught by Professor Bobburk during the Spring '08 term at Carleton CA.

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lect03 - Lecture3Units,Periodicity Length...

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