- Pour a few grams of ammonium dichromate onto a tile or into a metal bowl, in a pile.
- Ignite the pile from the top using a torch.
- Observe the decomposition of ammonium dichromate.
A rapid increase in the volume of the substance and color change
Scientific name: Thermal decomposition of ammonium dichromate
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(NH4)2Cr2O7 → Cr2O3 + N2 + H2O
Ammonium dichromate is an unstable substance due to the presence of Cr (VI) in its anion, which is a strong oxidant. Its thermal decomposition emits water in the form of steam, chromium oxide and nitrogen. Chromium oxide has a low density, in addition, the releasing gases loosen it.