109week1worked

109week1worked - Significant Figures/ Rounding Worked Out...

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Significant Figures/ Rounding Worked Out Significant Figures       Examples:  4.803 cm 4 sig figs 55.220 K  5 sig figs       0.00661 g 3 sig figs 34,200 m 3 sig figs Tip: Geography Rule: If decimal is Absent count from Atlantic; if decimal is Present start with Pacific. Scientific Notation       Examples:   55,000   5.5 x 10 4 0.000000000372 m  3.72x10 -10 0.00320  3.20 x 10 -3 150,000,000,000 m  1.5 x 10 11 How many sig figs do above numbers have? 2,3,3,2 Calculations To determine what number of significant figures you are supposed to have when doing  calculations, follow rules pages 22-23 in book. 1. When  adding  or  subtracting , the number of decimal places in the result is  the  number of decimal places  in the number with the fewest places. Example:        38  2500 + 273.15.
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This note was uploaded on 04/12/2008 for the course CHEM 109 taught by Professor Malina during the Spring '08 term at UNL.

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