Class 7 Chemistry Physical and Chemical Changes Introduction

Introduction

In our day to day life we come across many changes around us. For instance, dissolving sugar in water, burning of fuels, burning of coal or wood, setting of curd, stretched rubber band when left returns back to its original position, cooking of food and many more.  In all these reactions the starting material is undergoing changes to either give new product or remain in its changed position.

                    

Fig. Burning Wood (top left) cooking food (top right) Dissolving sugar in water (right) rubber bands (left)

In fact with the passage of time our body is growing and we are becoming taller. This is also a change. Our body is undergoing changes.

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