Metal oxides that decompose readily upon heating:
* Mercury(II) oxide (HgO): Decomposes into mercury and oxygen at around 350 °C. This reaction is used to produce elemental mercury.
* Silver oxide (Ag₂O): Decomposes into silver and oxygen at around 200 °C.
* Gold(III) oxide (Au₂O₃): Decomposes into gold and oxygen at around 160 °C.
* Platinum(IV) oxide (PtO₂): Decomposes into platinum and oxygen at around 500 °C.
Metal oxides that decompose at higher temperatures:
* Copper(II) oxide (CuO): Decomposes into copper and oxygen at around 1026 °C.
* Iron(III) oxide (Fe₂O₃): Decomposes into iron and oxygen at around 1597 °C.
* Nickel(II) oxide (NiO): Decomposes into nickel and oxygen at around 1650 °C.
* Zinc oxide (ZnO): Decomposes into zinc and oxygen at around 1975 °C.
Metal oxides that are very stable and do not decompose easily:
* Aluminum oxide (Al₂O₃): Extremely stable and decomposes at very high temperatures (around 2050 °C).
* Magnesium oxide (MgO): Highly stable and decomposes at around 2852 °C.
* Calcium oxide (CaO): Stable and decomposes at around 2572 °C.
Factors affecting decomposition:
* Metal type: The reactivity of the metal plays a major role. Less reactive metals tend to form more stable oxides that require higher temperatures for decomposition.
* Oxygen partial pressure: Lower oxygen partial pressure can favor decomposition.
* Presence of impurities: Impurities can influence the decomposition temperature.
* Heating rate: A faster heating rate may lead to decomposition at a higher temperature.
Note: This is not an exhaustive list, and there are many other metal oxides that decompose when heated. The decomposition temperature is a complex property that depends on various factors.
