* No new substances are formed: Cereal and milk retain their original chemical compositions when mixed. The milk doesn't turn into something else, and neither does the cereal.

* The change is reversible: You can separate the cereal and milk by pouring the mixture through a strainer or letting the cereal settle to the bottom.

* No chemical bonds are broken or formed: The mixing process only involves physical interactions like the cereal absorbing the milk and becoming softer.

In contrast, a chemical change would involve:

* The creation of new substances with different properties.

* The breaking and forming of chemical bonds.

* The change being irreversible without a chemical reaction.

Let me know if you have any more questions!