Heating of ammonium dichromate

Heating of ammonium dichromate

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Credit: PAUL SILVERMAN/FUNDAMENTAL PHOTOS/SCIENCE PHOTO LIBRARY

Caption: The 'Volcano effect', a result of heating crystals of ammonium dichromate ( formula (NH4)2 Cr2 O7 ). The reation produces chromic oxide (Cr2 O3) and nitrogen gas. The chromic oxide forms a volcano-like cone of dark green flakes on top of the red ammonium dichromate, with fresh chromic oxide being ejected upward under the influence both of the exothermic reaction and the evolved nitrogen gas.

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Keywords: ammonium, ammonium dichromate, chemical, chemistry, crystal, crystals, nitrogen gas, volcano effect

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