Describe the reaction of silicon dioxide (SiO2) with water and explain why it does not react.

Silicon dioxide does not react with water because it is insoluble in water and does not form any solution. This answer is anchored to Period 3 oxides (A-level only).

Silicon dioxide does not react with water because it is insoluble in water and does not form any solution. is the best answer because it directly supports the AQA A-Level Chemistry objective to explain reactions of Period 3 oxides with water. This reasoning is anchored to Period 3 oxides (A-level only) in Properties of Period 3 elements and their oxides (A-level only), and it separates Period 3 oxide from similar A-Level ideas rather than relying on a vague recall statement. Other options are weaker if they use the wrong evidence, calculation, mechanism, observation, unit, or conclusion for this subtopic.