gold + forge
astrolabe=star+mechanical clock
planisphere=star chart+astrolabe
in alchemy classic its 2 bacteria but it might be different in the original (assuming your playing alchemy classic)
You cant make alchemy classic, its a game! Though you can download it and play it!
fire+electricity
Algae + Plankton
2xBacteria=Cells
lplolol
fire and water
caoutchouc
In Alchemy Classic, you can create HNO3 (nitric acid) by combining H2O (water) with N2O5 (dinitrogen pentoxide).
In Alchemy Classic, you can create NO2 (nitrogen dioxide) by combining nitrogen oxide and oxygen.