Lab tools and Scientific Investigation
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Transcript of Lab tools and Scientific Investigation
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LAB TOOLS AND
SCIENTIFIC
INVESTIGATI
ON
E A R T H SC I E
N C E UN I T
1: S
C I EN T I F
I C
I NV E S T I G
A T I ON
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Main Lab Tools that you must be familiar with include: beaker, graduated cylinder, test tube, test tube tongs, meter stick, balance/scale, goggles, and Erlenmeyer flask
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BEAKERS
• Used for holding, mixing and sometimes measuring chemicals
• Unit used: milliliter (mL)
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• Used for measuring the volume of liquids.
• Very precise measurements
• Unit used: mL
GRADUATED CYLINDER
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• A finger-like length of glass, open a the top and usually a rounded U-shaped bottom.
• Sometimes used for boiling liquids
TEST TUBE
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• Use the test tube tongs to hold the test tube while heating liquids.
TONGS
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• A meter long stick or ruler
• Marked off in centimeters
• Used for measuring the length of objects
METER STICK
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• An scale used to find or measure the mass in objects
• Unit of measure is grams
TRIPLE BEAM BALANCE
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• 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.
GOGGLES
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• Used for holding, mixing, and heating chemicals
• Hard to tip over
• Unit: mL
ERLENMEYER FLASK
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• 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.
WAFTING
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1. What materials are available to conduct experiments?
2. How does _____ act?3. How can I change ______ to affect the
action? (IV)4. How can I measure the response of
__________ to show change. (DV)
4-QUESTION STRATEGY
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• A prediction about the outcome of an experiment.
• If/then• If=independe
nt variable• Then=depend
ent variable
HYPOTHESIS
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• The one factor scientists change during an experiment.
INDEPENDENT VARIABLE
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• 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.
DEPENDENT VARIABLE
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CONSTANTS The part of the
experiment that is kept exactly the same during each of the repeated trials of an investigation.
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• 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?
CONCLUSION