If touch spells can deal sneak attack damage, and touch spells can be applied via Unarmed Strikes, what happens if you use chill touch applied via an unarmed attack ?
Will it do Unarmed + Sneak Attack then Chill touch + Sneak attack?
Certainly not. The sneak attack is applied only once per attack. Sneak attack CAN be applied more than once a round, but requires multiple attacks to do so.