化學......

圖片參考：http://www.wpbschoolhouse.btinternet.co.uk/page03/3_33reactivity/reactivityfinal1.gif


圖片參考：http://www.wpbschoolhouse.btinternet.co.uk/page12/gifs/ReactivitySeriesList.gif













a. Any metals below hydrogen in the reactivity series do not react with acid. So, copper (Cu) should bt the answer.
P.S. Do not attempt to put K into acid, it is explosive!!!

b. Potassium (K) is the answer.
2K (s) + 2H2O (l) → 2KOH (aq) + H2 (g)
Observations:
1. Potassium float on the surface of water.
2. Potassium moves vigorously.
3. Potassium burns to give a lilac flame.
4. Potassium dissolves in water.
5. Some colourless and odourless gas is evolved.


c. K is the answer.
As mentioned above, potassium burns to give a lilac flame, when it is put in a non-luminous flame.


d. Cu is the answer.
Cu (s) + 2e- → Cu2+ (aq) (blue ion)
Copper (II) ion is blue in colour. For-example, copper (II) sulphate solution is blue in colour.

a Cu
b K
c K
d 唔識

2007-03-20 23:42:31 補充：
d 係 Cu2+