* Physical Changes: Alter the form or appearance of a substance but don't change its chemical composition.
* Chemical Changes: Result in the formation of new substances with different chemical properties.
In the case of iron melting:
* Iron's chemical composition (Fe) remains the same. It's still iron, just in a different state (liquid).
* The change is reversible. You can cool the molten iron and it will solidify back into its original form.
Key Points:
* Melting is a change in state, not a change in chemical makeup.
* The iron atoms themselves don't change their arrangement or bonding when they melt. They simply move more freely.
