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Measurement and Data Collection

Measurement and Data Collection. Pre-AP Biology. Bellwork. You are making a 10% gelatin solution by adding 10 g of gelatin to 100 mL of water and heating to 70 o C. What measurement tools would you use to make this solution? Be ready to share. Objectives.

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Measurement and Data Collection

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  1. Measurement and Data Collection Pre-AP Biology

  2. Bellwork • You are making a 10% gelatin solution by adding 10 g of gelatin to 100 mL of water and heating to 70oC. What measurement tools would you use to make this solution? • Be ready to share

  3. Objectives • Define the international system of units • Calculate conversions between metric units • Identify scientific tools in the laboratory used for measurement

  4. Purpose • Your experimental results will not mean very much if you don’t have a way to attach numbers or non-opinion descriptions to them. • The numbers collected must be expressed in units that have the same meaning world-wide • Scientists have developed tools to assist in data collection • Proper organization of the data allows the scientist to determine what the data really means.

  5. International System of Units-Metric System • Scientists use the metric or SI systems of units for the measurement of physical quantities-length, volume, and mass • This system of measurement is used world-wide • The metric system is a decimal system of measurement that is scaled on multiples of 10 • Prefixes are used in front of the units to indicate powers of ten

  6. Metric System

  7. Metric Prefixes

  8. Metric Conversions • When converting between metric units, follow these rules • Always convert to base units first • Ex. To convert cmkm must first convert cm to m then to km • Make conversions using the prefix definition • Ex. Use the conversion 1 cm = 102 m rather than 1 m = 100 cm

  9. Example • Conversion of 6.5 km to m • Start with what?

  10. Why do I need to learn this method? • You need to fill your swimming pool with your garden hose. The hose releases 1L of water per minute. Your pool holds 1000 kLof water. How long will it take to fill your pool? • Can you answer this by moving the decimal point?

  11. Example • Conversion of 6.5 km to mm

  12. Practice Problem-complete on note-taker • 435 mL  L

  13. Practice Problem-complete on note-taker • 5.39 g  mg

  14. Measurement tools used in Biology

  15. Reading a Meter Stick • Meter Stick – major scale division represent centimeters • Each cm is further divided into minor scale divisions-0.1 cm or 1 mm divisions

  16. Reading volume in a graduated cylinder • Graduated cylinder is marked off in equal units of volumes • Usually they are graduated in mLs • Most graduated cylinders have • Major scale divisions – associated with numbers • Minor scale divisions between the numbers • Read the volume at the bottom of the meniscus

  17. Use of balance for determining mass • In this class, an electronic balance will be used for measuring mass • Zero the balance by hitting the Tare button before each measurement • Place object on stainless steel tray • Read the value for mass • If you get the tray dirty, please clean it off

  18. Closure Activity • Name two measurement tools discussed in the notes today and explain how they are used in measurement.

  19. Measurement Lab

  20. Constructing well organized Data Tables

  21. Example of a Good Data Table- Effect of fertilizer on plants

  22. Think-Pair-Share Examine the example data table. Write down key characteristics of a data table on your note-taker. Share with a partner 3

  23. Data table characteristics • Title • Clear labels • Dates • Column/row labels • Units are included • Easy to view • Straight lines • All data can be displayed

  24. Minute Paper- think back to the bellwork You have one minute to write down qualitative and quantitative data in the form of a data table that you might take on the new species of plant Be prepared to share. 24 PROPERTY OF PIMA COUNTY JTED, 2010

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