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In our daily life we came across many changes in our surroundings. Such changes may involve one or more substances. For example, if you dissolve salt in water to make a solution. Making a salt 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.
NCERT solutions for class 7 Science prepared by Physics Wallah will help you to solve your NCERT text book exercise.