Final answer:
Neutral water reacting with carbon dioxide to form an acid solution illustrates a chemical property of water.
Step-by-step explanation:
Of the tests the students conducted, neutral water reacting with carbon dioxide to form an acid solution illustrates a chemical property of water. Chemical properties describe the characteristic ability of a substance to react to form new substances. In this case, water reacts with carbon dioxide to produce an acid solution, indicating a chemical change has occurred.