Final answer:
A physical change involves changes in properties of matter without altering the chemical composition, while a chemical change modifies the chemical composition of substances. Examples of physical changes include ice melting and a change in shape or phase, while examples of chemical changes include formation of ammonia from nitrogen gas and hydrogen gas, frying a raw egg, and rusting of a nail. Matter is conserved in both physical and chemical changes.
Step-by-step explanation:
A physical change is a change to a sample of matter in which some properties of the material change, but the identity of the matter does not. Examples of physical changes include ice melting, a change in shape or phase, and sorting a mixture of pennies and nickels. The composition of the substance remains the same in physical changes. On the other hand, a chemical change involves a transformation of one substance into another, resulting in a change in the chemical composition of the matter. Examples of chemical changes include nitrogen gas and hydrogen gas combining to form ammonia, a raw egg being fried, and the rusting of a nail. These examples demonstrate how chemical changes alter the chemical composition of the substances involved. Matter is conserved in both physical and chemical changes.