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Created by U. Illinois Dpt. of Chemistry
photo, ammonium dichromate volcano


What reaction occurs when (NH4)2Cr2O7 is decomposed?

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small photo, lighting volcano with bunsen burner
Video for Windows
small photo, lighting volcano with bunsen burner
Ammonium dichromate, (NH4)2Cr2O7, is an orange crystalline solid at room temperature. It can be ignited with high heat, such as that from a bunsen burner.


small photo, volcano burning
Video for Windows
small photo, volcano burning

The orange (NH4)2Cr2O7 is decomposed according to the equation below:

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

The dark green solid "volcano" is Cr2O3.