Final answer:
A physical change refers to changes in the form of matter that do not alter chemical composition or identity, such as melting or freezing, while chemical change results in the formation of new substances with new properties.
Step-by-step explanation:
A change in the form of a substance that does not cause a chemical reaction is known as a physical change. This type of change can be observed and felt without altering the chemical composition of the substance. In a physical change, the form of matter may change through processes like melting, freezing, or evaporating, but its identity remains the same since the particles are not broken up.
On the other hand, a chemical change involves the formation of new substances, often resulting in a permanent change that cannot be undone by physical means. These changes are typically accompanied by energy changes, color changes, the formation of a precipitate, or the production of gas.
Examples of physical changes include the melting of ice into water, the boiling of water into steam, and the shredding of paper. Examples of chemical changes include rust forming on iron, the burning of wood, and the cooking of an egg.