【正文】
ron air some metals electricity steel glass some metals electricity some metals (alloy(合金 ) for example) Potassium [p?39。nd] 擴(kuò)張 contract [‘k?ntr230。s?udi?m] [39。ni:zi?m] 鎂在空氣中燃燒: 2Mg + O2 點(diǎn)燃 2MgO 鐵在氧氣中燃燒: 3Fe + 2O2 點(diǎn)燃 Fe3O4 鋁在空氣中燃燒: 4Al + 3O2 點(diǎn)燃 2Al2O3 Let’s go on getting to know more metals Aluminum