* Chemical Composition Remains the Same: The chemical makeup of the sugar (sucrose) doesn't change. It's still the same molecules.

* Change in Physical Appearance: You're simply changing the size and shape of the sugar crystals.

* Reversible: You could potentially reconstitute the powder back into a cube (though it might not be exactly the same).

Key takeaway: Physical changes alter the form or appearance of a substance but not its chemical identity.