* Physical Change: The ice melting is a physical change. The chemical composition of water (H₂O) remains the same, whether it's in solid (ice) or liquid form. The change is only in the arrangement of the water molecules and their state of matter.
* Chemical Change: The reaction of water (from melted ice) with sodium is a chemical change. Sodium (Na) is a highly reactive metal that reacts vigorously with water to form sodium hydroxide (NaOH) and hydrogen gas (H₂). The chemical composition of the substances has changed, creating new substances with different properties.
Here's the chemical reaction:
2 Na (s) + 2 H₂O (l) → 2 NaOH (aq) + H₂ (g)
In summary:
* Melting of ice: Physical change
* Reaction of water with sodium: Chemical change
