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1.5 Section Review: #’s 1-4

1.5 Section Review: #’s 1-4. 1. Instruments are flawed and measuring always involves estimation. 2. Repeat the measurement several times; Compare the measurement to a standard or accepted value. 3. Last digit displayed is estimated. Estimate.

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1.5 Section Review: #’s 1-4

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  1. 1.5 Section Review: #’s 1-4 1. Instruments are flawed and measuring always involves estimation. 2. Repeat the measurement several times; Compare the measurement to a standard or accepted value. 3. Last digit displayed is estimated. Estimate. 4. Golf, clay pigeon shooting, temperature readings…are all examples

  2. Chemistry 1.5 Uncertainty in Measurements

  3. I. Making Measurements A. Digital Scale 1. Last number is estimated. 2. If flickers…use what is “preferred” 3. Use correct units! B. Scale 1. Ex: graduated cylinder, ruler, etc. 2. Parallax – angle of observation

  4. Which of the following eyes is correct for measuring a graduated cylinder?

  5. a. What is the volume of the water? b. Make measurements as accurate as possible! 43.0 ml

  6. Trash Ball Thrower…

  7. II. Reliability in Measurement A. Precision – how close a series of measurements are together. 1. Ex: Throwing Darts

  8. B. Accuracy – how close a measurement comes to the “accepted value”. 1. Ex: Throwing Darts accepted value = bull's-eye

  9. C. Pg. 24 Explanation Poor Accuracy Good Precision Poor Accuracy Poor Precision Good Accuracy Good Precision

  10. 1.5 wks (put into notes) The density of a solid is known to be 8.9 g/cm3. Create a scenario that describes the following situations: 1. High accuracy and high precision 2. Low accuracy and high precision 3. High accuracy and low precision 4. Low accuracy and low precision

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