Question

1.
Give two examples to show that changes
can be observed by their effects.​

Answer 1

Answer:

Germination of seed is a chemical change because seeds are dry before germinating but when they are fully germinated then they are wet and a plant like structure called sprout appears upon it Hence a new substance is formed that's why it is a chemical reaction.

Explanation:

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.