properties and change of properties in matter

Properties of Matter - A solid has certain characteristics: According to modern theory, the molecules of a solid are fixed in relation to each other. They vibrate in place, but do not wander around. This accounts for the fact that a solid keeps its own shape. Solids are usually ..

According to modern theory, the molecules of a solid are fixed in relation to each other. They vibrate in place, but do not wander around. This accounts for the fact that a solid keeps its own shape. Solids are usually crystalline. A solid is a crystalline substance in which the molecules, at..

Introduction - Today the fact that all matter is made up of atoms is universally accepted. Realisation of the atomic constituents of matter began in 1828 when Scottish botanist Robert Brown observed a random ceaseless motion of pollen grains suspended in a liquid. Many macroscop..

All around us are substances that are made of matter. Matter has mass and occupies some space. Different kinds of substances are made up of different matter. Matter can be thus classified in many ways. Two basic classifications of matter are based o..

Normally matter exists in three forms: Solid Liquid Gases Heat energy can bring about a change of state in matter from solid to liquid and liquid to gaseous state. Suppose a solid is heated continuously at constant pressure, its temperature goes on increasing till it s..

Pure Substances The distinctive features of pure substances are: A pure substance is composed of the same kind of particles e.g. hydrogen, oxygen, water, sodium chloride, etc. A pure substance is homogeneous, irrespective of its origin or method of preparation. A pure substance has defini..

Sodium hydroxide is a white deliquescent solid having melting point at 591 K (318°C) It is stable towards heat It is highly soluble in water and considerable amount of heat is evolved due to the formation of a number of hydrates e.g., NaOH.H 2 O, NaOH.2H 2 O. It is also soluble in alcohol ..

1. It is a pale yellow powder. It has strong smell of chlorine. It is soluble in water but a clear solution is never formed due to the presence of impurities. 2. On long standing it undergoes auto-oxidation into calcium chlorate and calcium chloride. 4. On account of the formation of nascent o..

Some of the synthetic detergents have very low biodegradability. They are resistant to bacterial attack and are not fully degraded in sewage treatment units. Therefore, they cause water pollution when they are discharged into a river or any other water body. Phosphate salts present in synthetic de..