Thermal Decomposition of Ammonium Dichromate (Volcano Reaction)

(NH₄)₂Cr₂O₇ → Cr₂O₃ + N₂ + 4H₂O

Aperçu

Ammonium dichromate decomposes spectacularly when ignited, producing green chromium(III) oxide, nitrogen gas, and water vapor. The green fluffy chromium oxide rises like a miniature volcano as gases escape, making this one of the most dramatic chemistry demonstrations.

Participants

Rôle	Substance	Coefficient	État
Produit	Nitrogen N	1	(g)
Produit	Water H₂O	4	(g)

Exemple du quotidien

This is the famous chemical volcano demonstration performed in science classes and science fairs worldwide.

Importance industrielle

Chromium(III) oxide produced by this and related reactions is used as a green pigment (chrome green), in magnetic tape coatings, and as a polishing compound.

Propriétés

Type: Decomposition
Réversible: Non
Énergie: Exothermique
ΔH: -315,0 kJ/mol

Réactions associées

Decomposition of Ammonium Nitrate Decomposition of Calcium Hypochlorite Decomposition of Carbonic Acid Decomposition of Iron(II,III) Oxide (Direct Reduction) Decomposition of Nitrous Oxide (Laughing Gas) Decomposition of Barium Peroxide Decomposition of Sodium Bicarbonate Decomposition of Water (Electrolysis) Thermal Decomposition of Copper(II) Carbonate Cracking of Octane (Thermal Cracking)

Frequently Asked Questions

What is the equation for Thermal Decomposition of Ammonium Dichromate (Volcano Reaction)?

The balanced equation is: (NH₄)₂Cr₂O₇ → Cr₂O₃ + N₂ + 4H₂O.

What type of reaction is Thermal Decomposition of Ammonium Dichromate (Volcano Reaction)?

Thermal Decomposition of Ammonium Dichromate (Volcano Reaction) is a decomposition reaction.

Is Thermal Decomposition of Ammonium Dichromate (Volcano Reaction) exothermic or endothermic?

Thermal Decomposition of Ammonium Dichromate (Volcano Reaction) is exothermic (releases energy). The enthalpy change (ΔH) is -315.0 kJ/mol.