to fix the Alchemy room you must take your scientist to the random pots laying around the island. there are 2 larger pots, a small red one, a mortar and pestal and a chalkboard (which is rolled up and looks like a long thin item-near the entrance to the room)
The chalkboard is not something that you get to fix the room, it gets fixed once you get all 5 items. the last is a spear tip, that was hard to find as where it lay in my game was on the stone steps next to the statue in the ampitheater and it blended in really well.
I also found a potion that made people run around yelling stinky breath and green smoke came from thier mouths! It was so funny, my 2 and 4 year old were rolling and yelling the same thing. My 4 year old wanted the green breath!! Of course I was not writing any of the potions down, but the healing one is great after you blow up a few potions. When you blow up potions, your people get hurt, once I had one of my scientists almost dead until I had to feed her this potion 4 times. You cannot do it in a row, it will tell you that they cannot drink the potion so quickly, you have to wait a couple of minutes. I found that if you have them drink it right off and then a few seconds before the potion evaporates, then it will work twice.