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Ammonium dichromate, (NH4)2Cr2O7, decomposes when heated to produce chromium(III) oxide [Cr2O3], nitrogen gas, and water vapor:

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

While the ammonium dichromate decomposes, it gives off orange sparks and throws the green chromium(III) oxide crystals into the air, producing an effect that looks like a miniature volcanic eruption.

The chromium(III) oxide crystals that are produced are "fluffier" than the original ammonium dichromate crystals, and even though a lot of the mass of the starting materials escapes as vapor, the product looks like a larger amount of material.

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Q: What happens when ammonium dichromate is strongly heated?
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