F.4 Chemistry - Ionic Equation

2006-11-26 2:07 am
希望有人可以解答我既問題
1. 什麼是ionic equation?
2. 以下情況會唔會有ionic equation,如果有,應該點寫?
I) potassium reacts with oxygen
II) zinc reacts with oxygen
III) sodium reacts with cold water
IV) zinc reacts with steam
V) potassium reacts with dilute hydrochloric acid

回答 (1)

2006-11-26 2:27 am
✔ 最佳答案
將沒有發生變化的成份排除在方程式之外便成為ionic equation了,亦即是ionic equation只寫出有變化的成份。例如 NaOH + HCl --> NaCl + H2O,NaOH,HCl 和 NaCl 都是完全電離的,在水中只存在 Na+、OH-、H+、Cl-等等,所以實質的變化只有

H+(aq) + OH-(aq) --> H2O(l)

這便成為ionic equation了。

I) potassium reacts with oxygen
4K + O2 --> 2K2O 沒有ionic equation

II) zinc reacts with oxygen
2Zn + O2 --> 2ZnO 沒有ionic equation

III) sodium reacts with cold water
2Na + 2H2O --> 2NaOH + H2 沒有ionic equation

IV) zinc reacts with steam
Zn + H2O --> ZnO + H2 沒有ionic equation

V) potassium reacts with dilute hydrochloric acid
2K + 2HCl --> 2KCl + H2
ionic equation : 2K(s) + 2H+(aq) ---> 2K+(aq) + H2(g)


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