* 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.

Here's how salt melts snow:

1. Lowering the Freezing Point: Salt dissolves in water, creating a solution with a lower freezing point than pure water.

2. Melting the Ice: Since the snow is below the new freezing point of the salt solution, it melts.

Key Point: The ice (H₂O) doesn't change its chemical makeup; it simply transitions from solid to liquid. The salt (NaCl) remains salt, and no new substances are formed.

Let me know if you have any other questions!