Chap2Lec - DRAFT (Chap 2) Page 1 Measurement (millimeters)...

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DRAFT (Chap 2) Page 1 Measurement (millimeters) ALL MEASUREMENTS CONTAIN UNCERTAINTY (THEY ARE NEVER EXACT) Accuracy Precision Poor Accuracy Poor Accuracy Good Accuracy Poor Precision Good Precision Good Precision Exact Numbers (two types)
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DRAFT (Chap 2) Page 2 Significant Figures Leading Zeros – zeros that precede all the nonzero digits Captive Zeros – zeros between nonzero digits Trailing Zeros – zeros to the right of the last nonzero digit 7.20 7200 720.0 7201 0.0005 0.034 0.0340 4000 0.4050 0.10 Trailing zeros after the decimal point are SIGNIFICANT Trailing zeros before the decimal point are NOT SIGNIFICANT* *slightly different than text definition (I will underscore the first uncertain digit throughout this class.)
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DRAFT (Chap 2) Page 3 Performing Calculations with SF’s Addition and Subtraction the result can have no more decimal places than the measurement with the fewest number of decimal places. 4.5 + 3
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This note was uploaded on 11/29/2010 for the course CHEM 101 taught by Professor Stegemiller during the Winter '07 term at Ohio State.

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Chap2Lec - DRAFT (Chap 2) Page 1 Measurement (millimeters)...

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