Question

Give two examples to show that changes can be observed by their effects. ​

Answer 1

Answer:

If a chemical change occurs there is anew substance is formed. Like when we add iron in copper sulphate then iron will displace the copper and at bottom copper fillings will be left leaving the green liquid. Next when we add Sodium in water it bursts out in this way also a chemical reaction can be identified.

Explanation:

hope this answer will help you a lot

Answer 2

Answer:

If a chemical change occurs there is anew substance is formed. Like when we add iron in copper sulphate then iron will displace the copper and at bottom copper fillings will be left leaving the green liquid. Next when we add Sodium in water it bursts out in this way also a chemical reaction can be identified