Maribel and Isabela were conducting the following experiment:

Question

Place and empty water bottle on the table and remove the lid. Carefully pour 10 ml of vinegar into the bottle.
Open up the mouth of the balloon and have your partner spoon 1 teaspoon of baking soda into the balloon.
Without spilling any of the baking soda, stretch the mouth of the balloon over the mouth of the bottle.
Turn the balloon completely upright so that the baking soda inside the balloon pours into the bottle with the vinegar.
The baking soda looked like it dissolved in the vinegar. Maribel and Isabela watched as the balloon expanded and filled with a gas. Was this a physical or chemical change and why?

Responses

It was a chemical change because the baking soda dissolved.
It was a chemical change because the baking soda dissolved.

It was a chemical change because a gas was produced.
It was a chemical change because a gas was produced.

It was a physical change because the water bottle got hot.

Answer 1

It was a chemical change because a gas was produced. When the baking soda (sodium bicarbonate) reacted with the vinegar (acetic acid), it produced carbon dioxide gas, which caused the balloon to expand. This chemical reaction resulted in the formation of a new substance (carbon dioxide gas) and therefore qualifies as a chemical change.

Answer 2

a b c or d

Answer 3

c