CHEM 1&2 Lab Manual & worksheets pg 220

CHEM 1&2 Lab Manual & worksheets pg 220 -...

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Factor Label Method General Chemistry I and II Lab Manual Dakota State University page 220 of 232 12 1 12 12 1 dozen = = Then, isn’t writing 12/dozen a form of writing 1? And since there are 2.54 cm in each inch, then isn’t 2.54 cm / 1 in another form of writing 1? Or 5,280 ft / mile, or 1 yd /3 ft all ways of writing the number one? And aren’t these constants all equal to dozen/12, 1 in/2.54 cm, 1 mile/5280 ft, or even 3 ft/ yd, respectively, since, after all, 1/1=1? We call these quantities “conversion factors.” A conversion factor is a fractional representation of the number 1. Since they are representations of 1, we are free to change the numerator and denominator at will , which you will eventually see is a very important characteristic in the factor label method. Another concept that is important is that of units being algebraic quantities. If we consider units to be algebraic quantities, then we can “cancel out” equivalent units in numerators and denominators. For instance, everybody knows that if
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