* Ice melting into water: The chemical composition (H₂O) remains the same, it's just changing states from solid to liquid.

* Cutting a piece of paper: You're changing the shape and size, but not the chemical makeup of the paper.

* Boiling water: Water changes from liquid to gas (steam), but it's still H₂O.

* Crushing a can: You're altering the shape of the can, but not its chemical composition.

* Dissolving sugar in water: The sugar molecules are dispersed in the water, but they don't change their chemical structure. You can get the sugar back by evaporating the water.

Let me know if you'd like more examples!