TURTLE ROCK SCIENTIFIC / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY TURTLE ROCK SCIENTIFIC / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY
Ammonium dichromate volcano. A small mound (3.6 g) of ammonium dichromate ((NH4)2Cr2O7) is placed on a ceramic tile. A fuse (rolled paper soaked in alcohol) is placed in the mound and ignited. Ammonium dichromate decomposes, it gives off orange sparks and throws green chromium(III) oxide, producing an effect resembling a volcano. The reaction is (NH4)2Cr2O7 -> Cr2O3 + N2 + H2O. The resulting chromium(III) oxide is fluffier than the original ammonium dichromate, giving the appearance that the amount of material increases in the reaction.
Model release not required. Property release not required.