You're looking for a change in matter that doesn't change the individual molecules themselves, but rather their arrangement or organization. This is called a physical change.

Here are some examples:

* Change of state:

* Ice melting into water, or water boiling into steam. The water molecules remain H₂O, but their arrangement changes from solid to liquid to gas.

* Freezing, condensation, sublimation, and deposition are other examples of changes of state.

* Dissolving:

* Sugar dissolving in water. The sugar molecules are still sugar, but they are dispersed throughout the water.

* Mixing:

* Mixing sand and salt. The sand and salt particles remain the same, but they are now physically mixed together.

* Crushing:

* Breaking a rock into smaller pieces. The rock is still made of the same molecules, but the overall shape and size have changed.

Key takeaway: In a physical change, the chemical composition of the substance remains the same. The molecules themselves don't change, only their arrangement or state.

Let me know if you'd like more examples or want to explore chemical changes where the molecules themselves are altered!