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Scientific Measurement

Scientific Measurement. Chapter 3. (3.1) Measurements. Have a quantity and unit. Scientific Notation. 6.02 x 10 23 (see pg. R56 of text for more practice). Percent Error. Error = Experimental value - Theoretical Percent error =. Accuracy and Precision.

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Scientific Measurement

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  1. Scientific Measurement Chapter 3

  2. (3.1) Measurements • Have a quantity and unit

  3. Scientific Notation • 6.02 x 1023 (see pg. R56 of text for more practice)

  4. Percent Error Error = Experimental value - Theoretical Percent error =

  5. Accuracy and Precision • How close a measurement comes to the actual value of what is being measured • How close a series of measurements are to one another

  6. Significant Figures KNOW the rules for determining sig figs! Pgs. 66-67

  7. Numbers whose digits are known with certainty and a final digit that is estimated

  8. 1) ALL non-zero numbers are ALWAYS significant. 2) ALL zeroes between non-zero numbers are ALWAYS significant. 3) ALL zeroes which are to the right of the decimal point AND at the end of the number are ALWAYS significant. 4) ALL zeroes to the left of a decimal point and in front of nonzero digits are not significant.

  9. 48,923 3.967 500.06 0.0004 8.1000 501.040 3,000,000 10.0

  10. Sig Figs in Calculations Many-Places Rule Mult./Div. – how many sig figs in least Plus/Minus – no. of places in least

  11. 305.1 x 35 5400 ÷ 9.89 305.7 + 35.035 5403 - 139.89

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