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Performance
Task:
Using steel wool, vinegar, test
tubes (or skinny jars) and water, students will conduct an
experiment to show what conditions are necessary for rust to
form.
Procedure/Directions:
The teacher will place one wad
of steel wool in a test tube and push it down to the end so
that it will not fall. The other wad of steel wool will be
soaked in vinegar, squeezed until fairly dry, and pushed
down to the end of another test tube. Place one-half inch of
water in a pan and stand the tubes upside down in the water.
After 15, 25, and 35 minutes, observe and record the
appearance of the steel wool and the height of the water in
the tubes.
Vocabulary to be
Stressed:
compound
substance
chemical
change
Checkpoint
Assessments:
Question and
Answer
Chemical change involves new
compounds being formed. What new substance was
formed?
What conditions are
necessary for rust to form?
Explain what happened in the
two tubes. Why do you think that happened?
The Graphic
Organizer
- quality of recording observations
- design (if created by student)
Teacher
Observation
- of class discussion about the experiment
Write a
Paragraph
- to explain what happens to bicycles when they are left out
in the rain. Be sure to tell why you
think that happens.
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