lab tools and scientific investigation n.
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Lab tools and Scientific Investigation

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  1. Lab tools and Scientific Investigation Earth Science Unit 1: Scientific Investigation

  2. Main Lab Toolsthat you must be familiar with include: beaker, graduated cylinder, test tube, test tube tongs, meter stick, balance/scale, goggles, and Erlenmeyer flask

  3. Beakers • Used for holding, mixing and sometimes measuring chemicals • Unit used: milliliter (mL)

  4. Graduated cylinder • Used for measuring the volume of liquids. • Very precise measurements • Unit used: mL

  5. Test tube • A finger-like length of glass, open a the top and usually a rounded U-shaped bottom. • Sometimes used for boiling liquids

  6. tongs • Use the test tube tongs to hold the test tube while heating liquids.

  7. Meter stick • A meter long stick or ruler • Marked off in centimeters • Used for measuring the length of objects

  8. Triple beam balance • An scale used to find or measure the mass in objects • Unit of measure is grams

  9. goggles • Always wear goggles when working with liquids—even water. • Goggles protect eyes from chemicals and solids that may be a result of a lab or someone horse playing.

  10. Erlenmeyer flask • Used for holding, mixing, and heating chemicals • Hard to tip over • Unit: mL

  11. wafting • a safe way to identify an unknown chemical. • bring the container towards your chin, while gently swirling the liquid around • wave the fumes slowly towards your nose. • Breathe normally. • NEVER stick your nose into a container of an unknown chemical!!! Nose, lung, throat or eye damage could result.

  12. 4-question strategy • What materials are available to conduct experiments? • How does _____ act? • How can I change ______ to affect the action? (IV) • How can I measure the response of __________ to show change. (DV)

  13. hypothesis • A prediction about the outcome of an experiment. • If/then • If=independent variable • Then=dependent variable

  14. Independent variable • The onefactor scientists change during an experiment.

  15. Dependent variable • The factor that changes as a result of the independent variable in an experiment. • The measurement of the growth of the plant is the dependent variable.

  16. constants • The part of the experiment that is kept exactly the same during each of the repeated trials of an investigation.

  17. conclusion • What was the purpose of the experiment? • Did the data support your hypothesis? • Why do you think you got these results? • What might you change next time?