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Ammonium dichromate volcano, 1 of 5

Ammonium dichromate volcano, 1 of 5

C043/6222

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Credit

TURTLE ROCK SCIENTIFIC / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY TURTLE ROCK SCIENTIFIC / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY

Caption

Ammonium dichromate volcano, 1 of 5. A small mound (2.4 g) of ammonium dichromate ((NH4)2Cr2O7) is placed in a watch glass. 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.

Release details

Model release not required. Property release not required.

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