The new perks for the specific chemthrowers are detailed here (note information may be outdated to actual in-game configs if I forget to update post.. sorry)

Arc Cutter;

• A melee-move turn-ending attack
  
• Costs no ammo
  
• Has a 3 turn cooldown
  
• Cannot miss
  
• Does extra damage to robotics, with a chance for shutdown

Wide Burst;

• A wider shorter spray, 2 Ammo to initiate, but will use ALL remaining Ammo
  
• Has a 5 turn cooldown, shared with the Direct Jet!
  
• Cannot miss
  
• Damages everything in a 'wall', explosive
  
• Costs 1 action point and is turn ending

Directed Jet;

• A thin long distance spray, 3 Ammo to initiate, but will use ALL remaining Ammo
  
• Cannot miss
  
• Has a 5 turn cooldown, shared with the Wide Burst!
  
• Damages everything in the 'line', explosive
  
• Costs 1 action point and is turn ending

Most of these values are config editable