BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Cutting your hair is a physical change. A physical change happens when a substance is altered somehow but remains the same substance. It is not chemically changed.

Detailed explanation-2: -Cutting logs of wood into small pieces is a physical change because no new substance is produced or formed. Burning of wood, Ripening of fruit, and Cooking of food are chemical changes because a new substance is formed in them and they are not reversible.

Detailed explanation-3: -It is also known as a physical change because it is not forming a new substance. Even though a substance may look different after being bent or cut, it is still the same substance as physical changed leave the chemical structure alone and they don’t produce any new substance.

Detailed explanation-4: -In cutting of a cloth no new substance is formed as the cloth is cut into two pieces only the size of cloth is changed. Hence, it is a physical change.