Question

Alison mixes baking soda and vinegar in a clear glass container. She places a blue balloon over the mouth of the container. Which condition tells Alison that a chemical change is taking place?

The balloon fills and expands.
The mixture is cloudy in appearance.
The balloon gets lighter blue as it expands.
The container holds a mixture of a solid and liquid.

Answer 1

The balloon fills and expands.

Step-by-step explanation:

The balloon expands because of the carbon dioxide being made by the mixture. That's the chemical reaction.