Question

es.
2. Give a few examples of
3. What happens to the chemical composition of the original substance during a chemical change?
4. How will you come to know that a chemical change has occurred?
5. What is the importance of chemical changes?​

Answer 1

Explanation:

1. examples of chemical reaction are.burning of magnesium ribbon in air.digestion etc .......
2. the chemical composition of the originals substance changes as it is a chemical reaction
3. in order to check whether the reaction is actually a chemical reaction we can observe the following changes. there will be change in colour,odour,shape,etc.....
4. the chemical changes are were important because it is very essential for not only humans but also to all the other organisms