JK Academy Std 7 Science Chapter 13 Changes – Physical and Chemical – question and answers
Exercise 1. Distinguish between the following. (a) Physical change and chemical change Physical Change Chemical Change 1. The properties of the original substances remain the same. 1. The properties of the original substances does not remain the same. 2. Their chemical composition remains unchanged. 2. Their chemical composition does not remain the same. 3. No …