To make chemical reactions quicker, obviously. What other purpose can Chemical King have?
Seriously, why is Chemical King in my comic book?
He's like they realized Element Lad was a little too God mode,* so instead of a guy who can turn you into nitrogen, they made a guy who can just make the nitrogen in the air form covalent bonds with your skin and lungs. You didn't fix the problem! Go die in World War VII, Chemical King!
And why does he use a Legion of Super-Villains naming formula?
So, how much of that was ignorant and how much of it well-reasoned critique? I'm guessing 50/50, but I hope it made you smile.
But, seriously, Tromians make Kryptonians and Daxamites look like punks. Good thing they're all dead, is all I'm saying. Jan's great, but I wouldn't feel comfortable sharing a universe with them. I admit it, I'm racist against matter transmutators.