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Volcano on the table

   Tools: mortar, scales, asbestos net, burner

       Chemicals: ammonium dichromate (NH 4 ) 2 Cr 2 O 7 , nitrate potassium starch     

           Procedure: the same weight ratios of ammonium dichromate and potassium nitrate mix together in a mortar and moisten with a few drops of water until a thick paste. Do přimísíme starch paste and knead the mixture with a glass rod stiff těleso.Z prepared mixtures produce rollers. Roller stand on a fireproof surface and set on fire kahanu.Po flame ignition rollers begin sršet sparks mass slowly glows and its volume zvětšuje.V the focal point creates a green snake.         

               Green matter is a mixture of chromium oxide, which binds starch. An attempt is effective than using only the ammonium dichromate itself, but the rollers must be dried.             

(NH4)2Cr2O7 --> Cr2O3 + N2 + 4H2O

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