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Reading Scales Module

Reading Scales Module. From http://www.uwplatt.edu/chemep/chem/chemscape/labdocs/catofp/measurea/scales/scales.htm. meniscus. Curved surface of liquid in a cylindrical container. Read from the BOTTOM of the meniscus. Important Point. Read a scale at eye level. Not from an angle.

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Reading Scales Module

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  1. Reading Scales Module From http://www.uwplatt.edu/chemep/chem/chemscape/labdocs/catofp/measurea/scales/scales.htm

  2. meniscus • Curved surface of liquid in a cylindrical container. • Read from the BOTTOM of the meniscus.

  3. Important Point • Read a scale at eye level • Not from an angle

  4. Reading A ScaleStep One: Determine the Increment • Scale is made of graduations. Some are labeled at regular intervals, with smaller, unlabeled graduations between them.

  5. Reading a ScaleStep One: Determine the Increment • To find the scale increment, subtract the values of any two adjacent labeled graduations and divide by the number of intervals between them.

  6. Reading a Scale Step One: Determine the Increment • 60mL – 50mL = 10mL • Count the number of intervals between 50 and 60. • There are 10. • So 10mL divided by 10 = 1mL graduation

  7. Practice • Pick 2 labels and subtract. • How many increments are there between those two numbers? • Divide

  8. Practice • Subtract the 2 values. • Count the increments between them. • Divide

  9. Practice • Subtract 7 – 6 • Count the increments. • Divide

  10. Practice • 25 – 20 • Count increments. • Divide

  11. Reading A ScaleStep Two: Use the graduations to find all certain digits.

  12. Step 3: Estimate the uncertain digit and take a reading

  13. Thermometer Practice

  14. What is the volume of the liquid in the graduated cylinder? 11.5 mL

  15. What is the volume of the liquid in the graduated cylinder? • 76.0 mL

  16. More interactive practice • practice scales • Lots more practice

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