Chap 1 Sec 6

# Chap 1 Sec 6 - 1.6 Uncertainty in Measurement Significant...

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Chap 1 Sec 6-sm-S.doc Page 1 1.6 Uncertainty in Measurement Significant Figures Rules for Counting Sig Figs ( Only for measurements!) 1. Non zeros (1,2,3,4,5,6,7,8,9) always count. 123.45 2. Zeros a) Leading zeros don’t count. 0.0467 3 sf b) Zeros in between do count. 4067 4 sf c) Trailing zeros: 1) Count if they are after a decimal point or the number ends in an unnecessary decimal point. 4670 . = 4.670 x 10 3 4 sf 2) Otherwise they don’t count. 4670 = 4.67 x 10 3 3 sf How many significant figures? These are all measurements! 514 ______ 306 ______ 5.14 ______ 0.306 ______ 5.140 ______ 0.0306 ______ 0.03060 ______

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Chap 1 Sec 6-sm-S.doc Page 2 3000 = ??? 3000 . = 4 sf Rules for calculations: Multiplication or division The sig figs in the answer = the least number of significant figures in a problem. Remember, integers have an infinite number of sig figs. Integers are counting things, like 5 students , or whole numbers in definitions like 12 inches = 1 foot, or 100 cm = 1 m (or 1
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## This note was uploaded on 04/06/2010 for the course CHEM 1A taught by Professor Okamura during the Fall '08 term at UC Riverside.

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Chap 1 Sec 6 - 1.6 Uncertainty in Measurement Significant...

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