Physical and Chemical Changes

A chemical change is a process where a substance transforms into a different substance with new chemical properties. Examples include burning, rusting, and baking.

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include melting, freezing, and dissolving.

Burning coal is a chemical change.

During a physical change, the substance changes shape, form, or appearance but remains the same substance.

Baking a cake is a chemical change.

Frying an egg is an example of a chemical change.

Rusting is a chemical change that occurs when iron reacts with oxygen and moisture, forming iron oxide (rust).

Yes, a rusty nail indicates a chemical change has occurred.

An example of a physical change is ice melting into water.

Yes, many physical changes can be reversed, such as freezing and melting.