hardness in classification of matter

Hard and Soft Water - Water is described as being 'hard' if it does not lather readily with soap. 'Soft water', on the other hand, is described as the one, which lathers readily with soap. Chemically, natural water is never pure and contains varying amounts of the dissolved impu..

Water is described as being 'hard' if it does not lather readily with soap. 'Soft water', on the other hand, is described as the one, which lathers readily with soap. Chemically, natural water is never pure and contains varying amounts of the dissolved impurities absorbed from the n..

It is known that soap is the sodium salt of stearic acid (C 1 7 H 3 5 COO - Na + , sodium stearate). When soap is added to hard water it reacts with the calcium and magnesium ions present in hard water. This forms an insoluble calcium or magnesium stearate (white and curdy p..

Matter can be classified into different categories depending upon their physical or chemical natur..

It possesses excellent electrical insulating character and hence its major use in making electrical goods. Used to make combs, fountain pen barrels, gramophone records, electric goods, formica table tops. Sulphonated bakelites are used as ion exchange resi..

Introduction - The classification of matter into three different states, namely solid, liquid and gaseous state is termed as the physical classification of matter. Most properties of solid, liquid and gases that can be observed with our sense organs are calle..

The States of Matter - Matter occurs in four states: Solid, Liquid, Gas and Plas..

Matter expands on heating, i.e., solids, liquids and gases expand on heating. Let us consider expansion of solids: Three types of expansions are considered in case of solids. This classification is done according to the shape of the solid..