solutions for the light pollutions (just copypaste them), a freebie, if you will, I don't think anyone should struggle with this, because it's not worth your time whatsoever:
CH4+2O2->CO2+2H2O
2CH4->C2H2+3H2
CO2+4H2->CH4+2H2O
2CH4+O2->2CH3OH
CH4+H2O->CO+3H2
CH4+CO2->2CO+2H2
CO+3H2->CH4+H2O
3C2H2->C6H6
2C6H6+15O2->12CO2+6H2O
Full credit goes to @qwerty741 for all the HARD WORK in figuring them out. I don't think it was that "easily found" as the author claims. I kneel before qwerty's brain and his style as well as humbleness, politeness and class - he's everything I am not. Newgrounds should be proud to have such user among its ranks.
In order to gain the medals, what you need is to copypaste the formula, buy the required ingredients and hover with mouse over the formula - it probably won't result in gaining anything, because qwerty also discovered that it probably requires a specific amount of the ingredients for the formula to ignite, so the easiest way to farm money is to use the first given formula and gain money that way. In case the medals don't work, also add the formulas to the recipe list just in case.
Thankfully I am neither classful, nor polite, so I will speak up my mind. The game is bad which is a ridiculous understatement. It was done quickly, without a coherent thought, and never improved. Sure, you can say "it's a demo". But I will never understand why would anyone add medals to an unfinished game? There are better ways to catch someone's attention, and obviously, I don't think people want to catch negative attention. Also, it's worth noting that not a single game by this author is good, or truly finished. Thankfully the habit of spamming low quality games ended somewhere around 2021 - For that, I am truly grateful and bow down with grace.