Sodium落水既reaction

Question

請問點解add sodium into water會係redox reaction既? 同埋條equation係點架?

Answer 1

The equation for the reaction of sodium with water :
2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)

The above reaction is redox :
Na(s) is oxidized, because the oxidation number of Na increases from 0 (in Na) to +1 (in NaOH).
H2O(l) is reduced, because the oxidation number of H decreases from +1 (in H2O) to 0 (in H2).