HUMAN NUTRITION

Detailed explanation-1: -Physical changes do not produce a new substance. Chemical changes result in the production of a new substance and cannot be reversed.

Detailed explanation-2: -A Physical change is a change that does not change the identity of the substance. for example, water changes from ice to liquid or from liquid to vapor its identity is still the same.

Detailed explanation-3: -Therefore, a change in which no new substance is formed is known as physical change.

Detailed explanation-4: -In a physical change the appearance or form of the matter changes but the kind of matter in the substance does not. However in a chemical change, the kind of matter changes and at least one new substance with new properties is formed.

Detailed explanation-5: -Physical changes are changes that do not alter the identity of a substance. Chemical changes are changes that occur when one substance is turned into another substance. Chemical changes are frequently harder to reverse than physical changes.