* No new substance is formed: When butter melts, it simply changes from a solid to a liquid. The chemical composition of the butter (fats, water, milk solids) remains the same.

* Change is reversible: You can easily solidify the melted butter again by cooling it down, returning it to its original state.

* No chemical bonds are broken or formed: Melting involves only a change in the arrangement of molecules, not the breaking or formation of chemical bonds.

In contrast, a chemical change would involve:

* Formation of a new substance with different properties.

* Irreversibility (often requiring a chemical reaction to reverse).

* Breaking and forming of chemical bonds.

Let me know if you have any other questions!