* No new substances are formed: When sulfur dissolves in carbon disulfide, it simply disperses as individual sulfur molecules within the carbon disulfide. The sulfur molecules themselves remain unchanged. There's no chemical reaction occurring, and no new chemical bonds are formed or broken.

* The change is reversible: The dissolved sulfur can be easily recovered by evaporating the carbon disulfide, leaving the sulfur behind. This reversibility is a characteristic of physical changes.

In contrast, a chemical change would involve:

* The formation of new substances with different chemical properties.

* The breaking and forming of chemical bonds.

* The change being irreversible or difficult to reverse.

Let me know if you have any other questions!