Vinegar added to baking soda forms a gas. Water evaporates into air. Sugar dissolves in water. Corn kernels are crushed to form flour.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which is an example of a chemical reaction?
Possibilities:
- Vinegar added to baking soda forms a gas.
- Water evaporates into air.
- Sugar dissolves in water.
- Corn kernels are crushed to form flour.

Vinegar added to baking soda forms a gas.