* Solubility: Chalk (calcium carbonate) is insoluble in water. This means that the chalk molecules do not break down and disperse evenly throughout the water.

* Suspension: When chalk is mixed with water, it forms a suspension. This means that the chalk particles are simply suspended in the water, and they will eventually settle to the bottom.

* Reaction: While chalk and water don't form a solution, a small amount of calcium carbonate will react with water to form a very small amount of calcium hydroxide and carbonic acid. This reaction is very limited, and the chalk will primarily remain as a solid.

In summary: While chalk and water can be mixed, they do not form a true solution. The chalk particles remain suspended, and only a tiny amount of reaction occurs.