Pasteurizing
 

I currently have a batch of the woodchuck clone going but added to much sugar. Could I pasteurize the batch before it ferments out?

Yes. Let it go down to the sweetness you want, then follow Papper's sticky for pasteurization.

Okay thanks

If I wanted to try and stop the fermentation with chemicals would it be difficult?

down right impossible. At least with the normal chemicals used by brewers.