"Baggie Lab"
1. I write the formulas for these products on the board and ask students to count and label the elements, then make observations about their bags (color, amount etc.).
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| CaCl2 and NaHCO3 |
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| A - 3 tsp NaHCO3 and1tsp CaCl2 (Endothermic) B - 3tsp CaCl2 and1tsp NaHCO3 (Exothermic) |
2. Add 20 mL of water and seal with out any air, shake to combine. *Optional - add 3 drops of phenol red to show a color change acid/base)
3. Make observations. Students should describe how they know a change has taken place and what kind (endo/exo) using evidence.
4. Compare Bag A to Bag B
5. Write a conclusion using the following "Sentence Starter"
Baggie Lab Conclusion
Our group had Bag___.
The procedures of the lab were____________________.
We had different results from the groups who had Bag__ because____.
A________change occurred. We know this because we observed the following evidence_____. It was a ______________ reaction because energy was _____________.
