Hypothesis: The soda pop and pop rocks will release more gas because both are filled with CO2.
The combination of pop rocks and coke did release enough CO2 to fill the balloon, but it wasn't filling very much (compared to other groups). Our group suspected that this was because our balloon wasn't completely attached to the top of the soda bottle.
The combination of vinegar and baking soda filled the balloon quite a lot, though-- more than three times as much as the poprocks and soda did, probably.
(The poprocks and soda mixture is on the left, obviously, while the vinegar and baking soda mix is on the right.)
Pop rocks are made with Co2, as is soda, (and we were using a whole bottle of soda) so I expected there would be more of a chemical reaction for that mixture than for the other one, but I was wrong.
Conclusion: The hypothesis was unsupported. I assumed the soda and poprocks would make more Co2 simply because of the high amounts of CO2. One thing we might have done wrong in this experiment was not tighten the balloon on the soda correctly, since it didn't fill up as much as other groups' did. This is a problem that can be easily avoided next time. One thing I learned in this experiment was that some food has more chemicals in it than we expect. I knew that the soda had CO2, but I wasn't aware that the pop rocks had any.
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