關於chem 想問下reaction[20點]

你話"係咪要記哂全部chemical既reacton先得?"
我認為要，但你最重要背考試d equation
我覺得d equation 其實唔係咁難背，因為有好多equation出o既product差唔多~
eg. potassium+oxygen→potassium oxide, copper+oxygen→copper oxide(呢d equation 來白reactivity of metal)
我個人會背哂d equation~
至於d equation 暫且不提供，因為你識左d equation但你唔明，費是搞到你越唔明~
1.magnesite is ore of magnesium carbonate can be extracted by electrolysis because magnesium is a quite reactive metal
2.First, heating the calcium carbonate to change white power called quicklime(calcium oxide) Equation is calcium carbonate →(heat) calcium oxide+carbon dioxide
Then add water to calcium oxide, calcium hydroxide forms.
Equation is calcium oxide+water→calcium hydroxide
calcium hydroxide is slaked lime that slightly soluble in water. The saturated solution formed is called limewater.

一. 無可能記得所有的化學變化。
二. 請不要本末倒置，化學的反應式是由實驗所得的，所以化學堂才會有實驗。
三. 除非興趣外，記了考試所需的方程就肯了。

Sodium + Oxygen -> Sodium oxide + Heat
Copper + con. Sulfuric acid -> Copper sulfate + Sulfur dioxide + Water + Heat
.......... etc.

1. Magnesium can be extracted from magnesite.
2. (i) Heat calcium carbonate for 5 min
　 (ii) Put the reactant into the water.