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Scientific Measurement Chapter 3

Explore the concepts of accuracy, precision, and error in scientific measurement, including qualitative and quantitative measurements. Learn about units of measurement and scientific notation.

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Scientific Measurement Chapter 3

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  1. Scientific MeasurementChapter 3

  2. Qualitative and Quantitative Measurement: • Qualitative measurement: • Results are descriptive • Results are in non- numerical form • (Quality) • Many, fuzzy, blue

  3. Qualitative and Quantitative Measurement: • Quantitative measurement: • Results are in definite form • Results are given in number and units • (Quantity) • 6 mL, 38 mph, 5 feet tall

  4. Accuracy, Precision, Error • What do we mean by accuracy? • A measurement of how close a measurement comes to the actual or true value of what ever is measured.

  5. Accuracy, Precision, Error • How about precision? • A measure of how close a series of measurements are to one another.

  6. Accuracy, Precision, Error • What is error? • The difference between accepted and experimental values.

  7. % error • To calculate % error, use the following equation: • Accepted – experimental value x 100% accepted value

  8. Units of Measurement:SI (International System of Units)

  9. Scientific Notation • In science, we deal with very small and very large numbers: • 1 mole= 602000000000000000000000 • Mass of electron= 0.000000000000000000000000000000091 kg

  10. Scientific Notation • A method of representing very large of small numbers in the form: M x 10n • Where: • M is a number between 1 and 9.9 • n is an integer

  11. . 2 500 000 000 9 7 6 5 4 3 2 1 8 Step #1: Insert an understood decimal point Step #2: Decide where the decimal must end up so that one number is to its left Step #3: Count how many places you bounce the decimal point Step #4: Re-write in the form M x 10n

  12. 2.5 x 109 The exponent is the number of places we moved the decimal.

  13. 0.0000579 1 2 3 4 5 Step #2: Decide where the decimal must end up so that one number is to its left Step #3: Count how many places you bounce the decimal point Step #4: Re-write in the form M x 10n

  14. 5.79 x 10-5 The exponent is negative because the number we started with was less than 1.

  15. Practice 159302 900024 0.000426 0.002

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