1 / 17

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.

Télécharger la présentation

Scientific Measurement Chapter 3

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  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

More Related