點解用碳還原法可以把氧化的金屬還原

平衡前: F2O3(s) + C(s) ---> F(s) + CO2(g)
平衡後: 2F2O3 + 3C ---> 4F + 3CO2

氧化鐵(3) 與碳共熱後,變成鐵和CO2
由於CO2係氣體,所以只剩下鐵。

for example of using iron oxide
iron oxide+carbon-->(after heat)iron+carbon dioxide
some metal oxide react to carbon after heating,carbon take away oxygen from metal oxide,as a result,iron oxide become iron..
this is called'碳還原法'