Performance Based Assessment
Are the students able to classify acids and
bases with a common household indicator? Try the assessment below,
or find out more about performance
based assessment.
Materials
Note: Label all cups and bottles.
 several
quarts of water, each mixed with a different acid or base
 1 pitcher cabbage
water
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 1 8-oz.
cup for each group
 8 1-oz. cups for each group
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What
To Do
 Repeat the Mysterious
Solutions Activity with new solutions and ask the students
to catorgorize the solutions into acids and bases. The students
need to be able to explain how and why they were able to classify
the solutions into acid, base or neutral solutions.
 Have the Materials Handlers
PASS out the following to each group: 1 8-oz. cup of cabbage
water; 8 1-oz. cups, each with a different testing solution.
 Have the Equipment Handlers POUR a small
amount of cabbage water into each cup of testing solution. HAVE
the Recorders RECORD the color changes.
 Invite the Speakers to PRESENT
their group's results to the class. Have the groups CLASSIFY
the solutions into acid, base, and neutral solutions and EXPLAIN
to the class how they decided which category to place each solution.
Authentic or Project Assessment
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