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一道高考化学试题的”硬“”活“”慢“——2026年高考化学陕晋宁青卷电化学选择题浅析

一道高考化学试题的”硬“”活“”慢“——2026年高考化学陕晋宁青卷电化学选择题浅析

13.某科研团队利用SCu2S的相互转化设计了如图所示电池。工作时,两极发生反应的SCu2S的物质的量相等。放电完成后,将一侧的电解液加热,产生的气体通入另一侧,可使电池重复工作。若性能显著衰减,经简单处理可恢复。下列说法正确的是

解析本题,不如尝试从一个问题入手:

什么是SCu2S的相互转化?

S要变成Cu2S,需要电极a上的S与电解质溶液中的Cu2+发生如下互动:

S+2Cu2++4e-=Cu2S,电极a正极

Cu2S要变成S,需要电极b上的Cu2S-2S失电子去实现。

那么,第二个问题来了!

工作时,电极发生反应的SCu2S的物质的量相等是什么意思?

我们已经知道正极反应消耗了1 mol S,联合2 mol Cu2+,一共得到4 mol电子,根据已知条件,另一极(负极)消耗的Cu2S也应该是1 mol,失去的电子的物质的量,也应该是4 mol,故负极电极反应为:

Cu2S-4e-=S+2Cu2+

同时还要注意到,负极区电解质溶液存在过量的NH3·H2O”,还会与生成的Cu2+发生后续反应:Cu2++4NH3=[Cu(NH3)4]2+

即就是,负极电极总反应应为:

Cu2S-4e-+8NH3=S+2[Cu(NH3)4]2+

将正负极反应相加,可得电池总反应:Cu2++4NH3=[Cu(NH3)4]2+

这个电池怎样充电呢?

放电结束以后,整个装置变成了以下布局

看起来是电极发生了互换,而电解质溶液还没准备好呢!

要把电极b区的[Cu(NH3)4]SO4变成CuSO4,给电极a区对应的电解质溶液补充NH3·H2O就能让电解质溶液互换。题目中给了一个方法:将一侧电解液加热,产生的气体通入另一侧。刚好,这种气体就是NH3

如此,电池就再生了!

最后,还有一个问题:膜是哪种膜?

思路1:电极互换前,电极b(负极)附近电解质溶液中,不断生成[Cu(NH3)4]2+,由电荷守恒可知,必须得有阴离子(SO42-)穿膜而过,以平衡多余出来的 [Cu(NH3)4]2+所带的正电荷,故该膜为阴离子交换膜。

思路2:也可以换个角度,从再生以后的电池开始思考,电极b负极电解质溶液中含有较多的SO42-,而电极a附近含有较少的SO42-,并且电极a为负极,根据原电池中阴阳离子移动规律正正负负,推知SO42-穿膜而过到负极区,以保证原电池为闭合回路

思路3:或者还可以根据Cu元素的来源与去向判断SO42-的移动方向。电解质溶液中的Cu2+在中正极区负责与电极上S得到Cu2S,所以Cu2+不可能穿过交换膜;[Cu(NH3)4]2+负极区生成,是为了受热释放出NH3,再通入另一侧,也不可能穿膜而过去正极区。综上,穿过交换膜的只能是SO42-

到这里,题目中的ABD三个选项都已经可以盖棺论定。

C选项可以通过负极电极总反应方程式:Cu2S-4e-+8NH3=S+2[Cu(NH3)4]2+进行判断。

本题很硬核在脱离了传统的给定电池总反应确定电极方程式的套路,在要在题干中一个字一个字抠字眼地推理论证,才能步步接近原理的真相。本题很在两个电极通过电极反应实现了自动互换在交换膜的判断方法可以从多个角度切入解决。

本题还很!传统的直接外加电源充电的二次电池,可以快速实现两个电极的各自再生。相比之下,本题的这个电池简直太了!先要加热一侧电解质溶液释放出氨气,再将氨气通入到另一侧电解质溶液中,让电极物质反应而再生于工业而言,这样的电池用牺牲速率的方法,降低了能耗。于教育而言,它比较符合教育的本真——一场慢的培育。

也许,我们可以把这道高考题设计成一节课,面向高一或者新高三的学生,提问讨论、证据推理、书写表达与技术革新的反思,都能俱全。

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  1. CONNECT:[ UseTime:0.000602s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000873s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000391s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000281s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000501s ]
  6. SELECT * FROM `set` [ RunTime:0.000191s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000599s ]
  8. SELECT * FROM `article` WHERE `id` = 782919 LIMIT 1 [ RunTime:0.000474s ]
  9. UPDATE `article` SET `lasttime` = 1782316661 WHERE `id` = 782919 [ RunTime:0.000651s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000218s ]
  11. SELECT * FROM `article` WHERE `id` < 782919 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000437s ]
  12. SELECT * FROM `article` WHERE `id` > 782919 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000408s ]
  13. SELECT * FROM `article` WHERE `id` < 782919 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000892s ]
  14. SELECT * FROM `article` WHERE `id` < 782919 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000658s ]
  15. SELECT * FROM `article` WHERE `id` < 782919 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000858s ]
0.111633s