You're not really an alchemist unless you've survived a few laboratory explosions. But suppose you want to cause an explosion on purpose? That's where this new Feat come in, which grants skilled spell casting alchemists the ability to concoct bombs imbued with elemental power. 

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Craft Alchemical Grenade (Item Creation)

You can create magical explosives.

Prerequisites: Brew potion, caster level 5th.

Benefit: This feat functions as brew potion, except it creates alchemical grenades by creating purposefully unstable versions of common potions.

An alchemical grenade is a thrown weapon with a range increment of 10 feet. It inflicts 1d6 damage +1d6 for each spell level of the spell used in the creation of the grenade, with an area effect of 5 feet. If the spell used to create the grenade has an elemental or energy type or descriptor, the grenade's damage is of that type. If the spell used in the creation of the grenade is already a damage-causing spell, the grenade reproduces the damage and area effect (if any) of the spell.

Alchemical grenades can be incorporated into traps.