Edexcel A Level Chemistry:復(fù)習(xí)筆記2.1.3 Redox & Disproportionation
Disproportionation
Disproportionation reactions
- A?disproportionation?reaction?is a reaction in which the same species is simultaneously oxidised and reduced
Example of a disproportion reaction in which the same species (chlorine in this case) has been both oxidised and reduced
Using Oxidation Numbers
Worked Example
Balancing disproportionation reactions
Balance the disproportionation reaction which takes place when chlorine is added to hot concentrated aqueous sodium hydroxide. The products are Cl-?and ClO3-?ions and water
Answer
Step 1:?Write the unbalanced equation and identify the atoms that change in oxidation number:
Step 2:?Deduce the oxidation number changes:
Step 3:?Balance the oxidation number changes:
Step 4:?Balance the charges
Step 5:?Balance the atoms
Worked Example
Oxidation and reduction
In each of the following equations, state which reactant has been oxidised and which has been reduced.
- Na++ Cl-?→? NaCl
- Mg + Fe2+? →? Mg2+?+ Fe
- CO + Ag2O? →? 2Ag + CO2
Answer 1:
-
- Oxidised: Cl-?as the oxidation state has increased by 1
- Reduced: Na+?as the oxidation state has decreased by 1
Answer 2:
-
- Oxidised: Mg as the oxidation state has increased by 2
- Reduced: Fe2+?as the oxidation state has decreased by 2
Answer 3:
-
- Oxidised: C as it has gained oxygen
- Reduced: Ag as it has lost oxygen
轉(zhuǎn)載自savemyexams
以上就是關(guān)于【Edexcel A Level Chemistry:復(fù)習(xí)筆記2.1.3 Redox & Disproportionation】的解答，如需了解學(xué)校/賽事/課程動(dòng)態(tài)，可至翰林教育官網(wǎng)獲取更多信息。
往期文章閱讀推薦：
2026 ALEVEL 夏考A率出爐！愛(ài)德思vs牛津AQA，哪些科目真的“好出分”？
2026 AMC10/12美國(guó)數(shù)學(xué)競(jìng)賽新賽季！【翰林教育 × 清華大學(xué)出版社】獨(dú)家教材全面發(fā)售！
翰林AMC8視頻課重磅上線！
國(guó)際競(jìng)賽真題資源免費(fèi)領(lǐng)取
