A chalk line or chalk box is a tool for marking long, straight lines on relatively flat surfaces, much farther than is practical by hand or with a straightedge.
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Chalk (Powdered CaCO3) may be used for fine polishing.
Chalk is water soluble. Which means rain would destroy the building.
Nothing will happen when you add water to chalk, because chalk does not dissolve in water. However, if you are drawing with chalk, as the water evaporates, it will allow the chalk to spread and create more fun.
chalk is a compound
dust from a chalk. Chalk is made from calcium carbonate, CaCO3.