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 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.