Edexcel A Level Chemistry:复习笔记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
转载自savemyexams
以上就是关于【Edexcel A Level Chemistry:复习笔记2.1.3 Redox & Disproportionation】的解答，如需了解学校/赛事/课程动态，可至翰林教育官网获取更多信息。
往期文章阅读推荐：
全网破防！ALevel CIE数学M1疑似错题？经济P2难度飙升？5月6日大考考情分析必看！
A-Level CIE就大规模泄题发布最严处罚！哪些考生必须重考？你的成绩怎么办？
翰林AMC8视频课重磅上线！
国际竞赛真题资源免费领取
