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Qualitative definitions

Qualitative definitions. Sept 20. Accuracy and Precision. Accuracy – how close the experimental value is to the accepted value Precision – how reproducible the experimental values are. Insert picture. Pg. 813. Significant Digits.

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Qualitative definitions

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  1. Qualitative definitions Sept 20

  2. Accuracy and Precision • Accuracy – how close the experimental value is to the accepted value • Precision – how reproducible the experimental values are Insert picture Pg. 813

  3. Significant Digits • Precision is the place value of the last measurable digit and is determined by the instrument • 12.0 g vs 12 g vs 10 g • Non-zero numbers are significant • Zeros to the left are not significant • Zeros to the right are significant

  4. In Calculations • In addition/subtraction • the final sum has the same precisions the least precise digit • In multiplication/division • the final product has the same number of significant digits (sig figs) as the factor with the smallest number of sig figs

  5. Rounding • Never round off during a calculation • Round when reporting the final answer • Use 5 as the turning point

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