* Chemical change: Involves the formation of new substances with different chemical compositions. This means breaking and forming new chemical bonds.

* Physical change: Alters the form or appearance of a substance but not its chemical composition. The molecules stay the same.

When you freeze juice, the water molecules slow down and arrange themselves into a crystalline structure (ice). The juice itself hasn't changed its chemical makeup; it's just in a solid state instead of a liquid state. You can thaw the juice and it will return to its original liquid form.

Key takeaway: Freezing is a physical change because it doesn't create new substances, just alters the state of the existing ones.