Heating the metal oxide

如果直接heat一d metal oxide with metal係very stable, 咁就heat完個oxide可以出番個metal
例如heat silver oxide, mercury oxide
2Ag2O -> 4Ag +O2 2HgO -> 2Hg +O2
因為佢地個metal係stable, 咁form o既compound (即oxide) 就會好unstable, 好想form番做metal
所以stable silver同mercury o既oxide 就會heat完出番metal
比silver unstable o既metal 所form o既 oxide heat全部都係no observable change
e.g. aluminium oxide, sodium oxide, iron(II) oxide 等

Among common metal oxides, silver oxide and mercury(II) oxide will be decomposed on heating to give metal and oxygen gas.
2Ag2O(s) → 4Ag(s) + O2(g)
2HgO(s) → 2Hg(l) + O2(g)

Heating other metal oxides would not have any observation, because no reactions occur.

直接 heat metal oxide 係唔會出 metal 的
要用 heat with carbon 的方法

iron (III) oxide (Fe2O3), lead(II) oxide (PbO) zinc oxide等等都可以用heat with carbon的方法提取metal

2Fe2O3 + 3C ---[heat]----> 4Fe + 3CO2
2PbO +C ----[heat]----> 2Pb +CO2
2ZnO +C ----[heat]---->2Zn +CO2

reactive的metal 的oxide 係不能用heat with carbon 來提取 原metal的
如 aluminium oxide (Al2O3) magnesium oxide (MgO)