Chem (equation )

The answer is as follows :


圖片參考：http://dc268.4shared.com/img/Sy8LzTHuba/s7/1440d031a18/2014-02-07D.png?async&rand=0.5482152244104574

http://dc268.4shared.com/img/Sy8LzTHuba/s7/1440d031a18/2014-02-07D.png?async&rand=0.5482152244104574


2014-02-08 23:21:12 補充：
The common technique of writing an ionic equation is :
(1) when a reactant (an aqueous acid, aqueous alkali or aqueous ionic compound) is dissociated in water to give ionic species, write it in ionic form.
(2) when an ionic species appears on both sides of the equation, cancel it on both sides.

2014-02-08 23:22:31 補充：
Consider the equation :
CaCO3(s) + H2SO4(aq) → CaSO4(s) + H2O(l) + CO2(g)

CaCO3 is a solid. It is NOT necessary to write it in ionic form.
H2SO4 is ionized in water to give 2H^+(aq) and SO4^2-.
CaSO4 is a solid. It is NOT necessary to write it in ionic form.

2014-02-08 23:22:42 補充：
H2O is a liquid and it is mainly NOT ionized. It is NOT necessary to write it in ionic form.
CO2 is a gas. It is NOT necessary to write it in ionic form.

Then, the ionic equation is :
CaCO3(s) + 2H^+(aq) + SO4^2- → CaSO4(s) + H2O(l) + CO2(g)

2014-02-08 23:23:32 補充：
Let's take one more example. The equation for the reaction between magnesium and dilute hydrochloric acid is :
Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)

2014-02-08 23:23:47 補充：
Mg is a gas. It is NOT necessary to write it in ionic form.
2HCl is a strong acid which is dissociated in water to give 2H^+(aq) and 2Cl^-(aq).
MgCl2 is dissociated in water to give Mg^2+(aq) and 2Cl^-(aq).
H2 is a gas. It is NOT necessary to write it in ionic form.

2014-02-08 23:23:58 補充：
Then, the ionic equation becomes :
Mg(s) + 2H^+(aq) + 2Cl^-(aq) → Mg^2+(aq) + 2Cl^-(aq) + H2(g)

Cancel 2Cl^- on the both sides. The final ionic equation is :
Mg(s) + 2H^+(aq) → Mg^2+(aq) + H2(g)

2014-02-08 23:24:52 補充：
請看意見欄。

But still, you have to write the soluble components in ionic form, eg. H(+), SO4(2-).