BillyBill: “I think that a new substance formed when the soda was poured into the bottle because the balloon blew up a little.”
SusieSus: “I think that a new substance formed when the soda was poured into the bottle; and when the vinegar and baking soda were combined, they both blew up the balloon a little.”
Jimothy: “I think that neither one had a new substance form because the vinegar and baking soda are still vinegar and baking soda, and the soda is still soda.”