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Main Curriculum Tie:
Background For Teachers:
Communication of scientific thinking is an important skill. Praise students for valid reasoning and identifying supportive data. If their reasoning is incorrect, help them clarify their thinking.
Intended Learning Outcomes:
Step 1. Using the balance, record the weight of the sheet of cardboard. Tear or cut the cardboard into small pieces. Using the balance, again record the weight. Is the weight the same or different? How would you explain this? [Mass is conserved.]
Step 2. Place 2 tablespoons of vinegar into the bottle. Using the funnel, pour 1 tablespoon of baking soda into the balloon. Carefully attach the balloon to the top of the bottle. Do not allow any baking soda to pour into the bottle. Using the balance, record the mass of the bottle, soda, balloon, and vinegar.
Step 3. Mix the vinegar into the baking soda by lifting the balloon and allowing the baking soda to pour into the bottle. Make sure the balloon remains attached to the neck of the bottle. After the fizzing stops, again record the mass of the items. Is the weight the same or different? How would you explain this? [Mass is conserved.]
Step 4. Remove the balloon. Put the balloon and bottle on the balance. Weigh the items. Is the weight the same or different? How would you explain this? [Air has weight. The air escaped from the balloon, making the total weight less than before.]
Step 5. Compare the data from the cardboard experiment with the data from the baking soda and vinegar experiment. What is similar and what is different? How would you explain this?
Step 6. Write an explanation for the following phenomena.
Step 7. Predict the results of the following actions:
Step 8. Plan an experiment that will demonstrate that matter is neither created nor destroyed even though it may undergo change.
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