Introduction To Physical and chemical Changes

Every day you come across many changes in your surroundings.These changes may involve one or more substances. For example, your mother may ask you to dissolve sugar in water to make a cold drink. Making a sugar solution is a change. Similarly, setting curd from milk is a change. Sometimes milk becomes sour. Souring of milk is a change. Stretched rubber band also represents a change.Make a list of ten changes you have noticed around you.In this chapter we shall perform some activities and study the nature of these changes. Broadly, these changes are of two kinds, physical and chemical

Fig. 6.1  Paper pieces