F.4 CHEM - Ans.fyi 參考答案

F.4 CHEM

2009-12-27 8:08 am

1. When sodium chloride and magnesium carbonates are extracted by electrolysis, what are the products?

2. Why carbon monoxide is used instead of carbon to reduce oxides of metals below aluminium in the reactivity series?

3.Write the ionic equation:
3Mg(s)+2Al(NO3)3(aq)->3Mg(NO3)2(aq)+2Al(s)

回答 (1)

amandawong99

2009-12-27 10:56 pm

✔ 最佳答案

1.因為係aqueous solution既關係,入面有OH-,所要佢會優先 discharge,會form水同oxygen起anode到.至於cathode就係有hydrogen.最重要既係你個 sodium chloride 係dil定係brine solution.如果係conc既話anode就會有chlorine因為 concentration effect.

2.不太清楚,好似CO比C仲係stronger reducing agent wo
我記得係好似沒咩分別,分別用既效果沒咩差異,可能因為CO係poisonous,只是一reduse就會變CO2,好過C之後變CO!

3.3Mg + 2Al3+ ------------> 3Mg2+ 2Al
NO3係spetator ion 所以唔洗寫落去

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