DISCUSS:
If chemical reactions can make gases, do you think they can make liquids or solids, too?
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Craft Sticks
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1 stick per pair |
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Cups (Paper, 3 oz, Dixie)
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2 cups per pair |
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Plates (Plastic, 10")
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2 plates per pair |
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Ziploc Bags (Snack Size)
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2 bags per pair |
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Baking Soda
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1 cup per class |
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Corn Starch
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1 cup per class |
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Cups (Plastic, 9 oz, Solo)
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3 cups per pair |
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Plastic Spoons
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3 spoons per pair |
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White Vinegar
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1 cup per group |
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Explosion Investigation printout
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1 per student |
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Explosion Investigation - Answer Key printout
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1 per class |
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Clean-up Supplies (Eg. Paper Towels)
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1 roll per class |
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Scissors
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1 pair per student |
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Safety Glasses
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1 pair per student |
We suggest students work in pairs.
Divide your plastic cups into three equal piles. Use a sharpie to label each cup in one pile "A", label those in the second pile "B", and those in the third pile "L" for liquid. Add a tablespoon of corn starch to each "A" cup, add a tablespoon of baking soda to each "B" cup. Pour a half cup of vinegar into each of the "L" cups. Then, place one spoon into each cup.
We suggest organizing supplies as shown below for easier distribution.
The plastic baggies are intended to inflate and pop. Some accommodations you can make to decrease noise levels include (1) reducing the amount of liquid and powder in the bags so that they inflate but do not pop, or (2) modifying the activity as a teacher-led demonstration.
Conduct an investigation to determine whether the mixing of two or more substances results in new substances.
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