Formaldehyde is a colorless, flammable, strong-smelling chemical that is used in building materials and to produce many household products.ormaldehyde is a colorless, flammable, strong-smelling chemical that is used in building materials and to produce many household products.
Actually most of the salts are insoluble in water. Not all the salts include chloride!!! And of those witch contain chloride, silver, led and mercury salts are insoluble!!! chemically speaking, not all salts are soluble in a particular solvent under normal conditions..
When you mix sugar with water, the sugar dissolves to make a transparent solution. Salt dissolves in water too. Heat can help some substances dissolve faster in water. Salt, for example, will dissolve quicker in hot water than in cold water. Substances that dissolve in water are called soluble substances.Substances that do not dissolve in water are called insoluble substances. When you mix sand or flour with water, they do not dissolve.1  Page: 2  1. 3  2. 4  3. 5  4.6  5.ubstances that dissolve in water are called soluble substances. Substances that do not dissolve in water are called insoluble substances. When you mix sand or flour with water, they do not dissolve. 1  Page: 2  1. 3  2. 4  3. 5  4. 6  5.