iron分別放入冷水,熱水和自來水

各情況都會,
不過係有快慢之分,
溫度愈高 鐵生銹的速度愈快
所以生銹的速度: 冷水<自來水<熱水

2010-02-15 13:11:39 補充：
no observable change =/=(is not equal to) no reaction
please remind this important point

2010-02-15 13:32:44 補充：
Here, the reaction is rusting.
Since rusting is a slow reaction of corrosion, you cannot see any observable change at first.