DISCUSS:
What makes these things explode? What’s going on?
DISCUSS:
Why do you think the containers were shattering?
DISCUSS:
On the back of your worksheet, draw a picture using a particle model to explain why the bag exploded. (Or you can label or add to the picture you drew earlier.)
Look at the holes in this slice of banana bread. Each hole was made by a bubble that formed while this was baking. Those bubbles made the loaf rise.
Go to the next slide to discuss where those bubbles came from.
Here are the ingredients used to make banana bread:
Discuss:
See previous slide for a view of the holes in banana bread. See next slide for more about the bubbles in bread.
Any cake that rises as it bakes has bubbles in the batter. Take a look at some cake recipes. Can you figure out which ingredients make bubbles in each recipe?
If you need help, check out this extensive discussion of leavening agents. (A leavening agent is a substance that produces gas to make bubbles in a batter.)
In this lesson, students investigate and model how gases cause explosions. In the activity, Bag of Bubbles, students experiment by combining baking soda and vinegar inside a sealed bag and observe how the gas bubbles produced cause the bag to inflate–and sometimes pop!
Preview activity
I don't have a Mystery Pack
In your Mystery Pack Lesson Bag
|
|
---|---|
Cups (Dixie 3 oz) | 1 cup per student |
Plastic Plates (10") | 1 plate per pair |
Ziploc Bags (Snack Size) | 1 bag per student |
Safety Glasses | 1 pair per student |
In your Mystery Pack Shared Supplies
|
|
Baking Soda | 4 tablespoons per pair |
Measuring Cup | 1 cup per class |
Plastic Spoons | 2 spoons per pair |
Solo Cups (9 oz) | 2 cups per group |
White Vinegar | 1 cup per 8 students |
Not included in your Mystery Pack
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|
Capturing Chaos printout | 1 per student |
Stretchy Bag Templates printout | 1 per group |
Clean-up Supplies (Eg. Paper Towels) | 1 roll per class |
Scissors | 1 pair per student |
We strongly recommend that students wear eye protection for this activity.
We suggest students work in pairs for the first activity, and in groups of four for the second activity. Students working alone will need a partner for the first activity, and a few friends to help with the second activity.
Separate your plastic cups (or plastic containers) into two separate piles. For each of the cups in one of the piles, pour about ½ cup of vinegar. For the other cups, pour about ½ cup of baking soda into each.
For the first activity, students will need the following supplies, plus a recommended pair of safety goggles for each person:
In the second activity, students will work in groups of four and will need the following materials:
You may want to separate these for ease of classroom distribution.
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