Source:
The Need Project
Topics Elementary School,
Physics
Grade Levels:
K-3
Question:
Will salt water freeze?
Possible Hypotheses:
Salt water will/will not freeze.
Materials:
Three small plastic cups
Water
Salt
Procedure:
- Fill the cups half-full with the same amount of water.
- Add 1 tablespoon of salt to one cup. Mark it with an S. Add 2 tablespoons of salt to another cup. Mark it with an SS. Stir the cups. Mark the third cup with a C. This is your control.
- Place the cups in the freezer. Observe the cups every 15 minutes for two hours.
Analysis and Conclusion:
Did all the cups of water freeze? Which froze first? What does this experiment tell you about salt?
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Reprinted with the permission of the NEED Project. © 2008 National Energy Education Development Project - All Rights Reserved.
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