* Chemical Change: Involves the formation of new substances with different chemical compositions. This often involves breaking and forming new chemical bonds.

* Physical Change: Alters the form or appearance of a substance but not its chemical composition.

When you tear paper, you're simply breaking the paper into smaller pieces. The cellulose fibers that make up the paper remain the same, just in a different arrangement. There's no change in the chemical makeup of the paper.

Examples of chemical changes: Burning paper, rusting of iron, cooking an egg.

Examples of physical changes: Tearing paper, melting ice, boiling water.