Workshop #1
Chem 1A
Fall 2010
Significant Figures
All nonzero digits are significant
All zeros to the left the first nonzero digit are not significant
If the number is greater than 1 and has a decimal point, all zeros are significant
(230.000 has 6 significant figures)
If the number does not have a decimal point, zeros may not be significant
Zeros flanked by an integer (ex. 104) are significant
Multiplication/Division: the number of significant figures in the product/quotient is
determined by the original number with the least significant figures
Addition/Subtraction: the number of significant figures in the sum/difference is
determined by the original number with the least significant figures to the right of
the decimal point
Exact numbers resulting from a count (5 watermelons) or from a definition can be
considered to have an infinite number of significant figures
Problems
1.
Express
39807000 in scientific notation with the proper number of significant
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 Fall '10
 BenHafensteiner
 Chemistry, Scientific Notation, Atom

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