Rising Raisins with Luna™ -Learning Resources®
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Rising Raisins with Luna™
Untitled Document
Time:
15-25 Minutes
Materials: Luna™,
Projector, 16-ounce cup,
1/2 cup vinegar, 2 Tablespoons baking
soda, raisins, tap water
Skills: Exploring chemical reactions
           and density

Grades: 3-4
Small Group
Grouping:
Whole Class
Model
1. Fill the cup with tap water. Place the Luna in front of the cup and connect it to the computer and projector. Discuss density with the students and explain how raisins have a greater density than the water.

2. Ask the students to predict if raisins will float or sink in the water. While
recording the process
with Luna, place the
raisins in the water
and observe what
happens.
[The raisins will sink.]
Discuss this with
students and empty
the cup.
Guide
3. Explain how mixing vinegar, water, and baking soda creates a chemical reaction that produces carbon dioxide gas. our vinegar into the cup, fill to the top with water, then stir in the baking soda. Capture the process with Luna so students can see how the carbon dioxide is created.

4. Discuss what is happening in the glass. As students discuss the bubbles rising ask them to predict what will happen when the raisins are placed in the solution.
5. Place the raisins
in the cup and capture
what is happening with
the raisins.

[First the raisins will
sink, then carbon
dioxide bubbles will
adhere to the raisins
and cause the raisins
to float. At the surface
the bubbles release
and the raisins sink.]

6. Have the students form conclusions about the chemical reaction, the bubbles, and how the raisins behave as a result of this chemical reaction.
Assess
7. Have the students repeat the process on their own, using Luna to record it. Have them write a short paragraph using observations and science vocabulary.
Extend
8. Have the students identify other objects to place in the solution and make predictions about how they will respond to the carbon dioxide bubbles.
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