Answer
A physical property is one that a substance displays without changing its composition. A chemical property is one that a substance displays only by changing its composition via a chemical change.
Work Step by Step
An example of a physical property is the smell of gasoline. Gasoline doesn't change its composition when it exhibits its odor.
An example of a chemical property is the flammability of gasoline. Gasoline changes its composition when it burns and essentially turns into carbon dioxide and water.