Emi drops a cup of baking soda into a glass container that has vinegar at the bottom of it. Then, she quickly puts a balloon on top of the container. What do you predict will happen to the balloon?

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The balloon will get bigger because it will become filled with solid (baking soda) particles that are too small to be seen.
The balloon will get bigger because it will become filled with liquid (vinegar) particles that are too small to be seen.
The balloon will get bigger because it will become filled with gas particles that are too small to be seen.
The balloon will stay the same because it will not become filled with anything.

The correct answer is: The balloon will get bigger because it will become filled with gas particles that are too small to be seen.

When baking soda (sodium bicarbonate) reacts with vinegar (acetic acid), it produces carbon dioxide gas. This gas fills the balloon, causing it to inflate.