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?

Question

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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 condition that tells Alison that a chemical change is taking place is the balloon fills and expands. This occurs because the reaction between baking soda (a base) and vinegar (an acid) produces carbon dioxide gas, which causes the balloon to inflate.