Can you explain what a decomposition reaction is in chemistry?
user
Sure. Decomposition reactions are when one or more substances in a chemical compound, molecule, or ion break down into component parts.  The original compound generally loses an atom or molecule of gas, and becomes a smaller compound.  Decomposition reactions are typically exothermic, and often accompanied by a release of energy or heat.
assistant
Can you explain what a decomposition reaction is in chemistry?
user
Sure, a decomposes reaction is one that breaks an original compound or molecule into smaller units.  For example, if you take carbon dioxide (CO2) and apply heat and pressure, it decomposes according to the following reaction, to form carbon monoxide (CO) and oxygen (O2):
CO2 → CO + O2

Alternatively, some compounds can break apart into simpler molecules.  For instance, if you treat calcium carbonate (CaCO3) with acid, it decomposes to form calcium ions, carbonate ions, and carbon dioxide:
CaCO3 → Ca2+ \+ CO32-  + CO2
assistant
Can you explain what a decomposition reaction is in chemistry?