sone basic concepts of chemistry

[Page 1] Some Basic Concepts of Chemistry Changes Among Various States of Matter Change of State - An Overview In daily life, we see different kinds of changes in the states of matter. The formation of ice cubes from water in the refrigerator is an example of a change in the state of matter from liquid to solid. When water is boiled, vapours are formed. This is an example of change in the state of matter from liquid to gas. The following terminologies are used to describe the changes in the states of matter. • Chan ge from the solid state to the liquid state is called melting . • Change from the liquid state to the solid state is called freezing . • Change from the liquid state to the gaseous state is called vapourisation . • Change from the gaseous state to the liquid state is called condensation . There are two other changes between the three states of matter — sublimation and deposition. Sublimation : It is the process in which a substance changes directly from the solid state to the gaseous state without entering into the liqu id state. The changing of snow into water vapour is an example of sublimation. Some common examples of substances that sublime are dry ice, camphor, and naphthalene. Deposition : It is the process opposite to sublimation. In this, a substance changes direct ly from the gaseous state to the solid state. Frost is an example of deposition. Did You Know? When we open the refrigerator, we see freezing fog. This is nothing but condensed water. Air contain