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A miniature volcano occurs when (NH4)2Cr2O7 is decomposed!
This mini volcano is analagous to a cinder/spatter cone.
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||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.|
The orange (NH4)2Cr2O7 is decomposed according to the equation below: