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【2026版化学步步高大二轮专题复习讲义专题五微点突破2化学反应速率计算与大小的判断

  • 2026-02-14 08:54:43
【2026版化学步步高大二轮专题复习讲义专题五微点突破2化学反应速率计算与大小的判断

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微点突破2 化学反应速率计算与大小的判断

1.化学反应速率的影响因素

(1)利用外因对化学反应速率的影响判断

(2)影响速率的因素中几类特殊情况

温度

催化反应:升高温度,催化剂可能失活,反应速率可能减慢;

有机反应:升高温度,有可能发生副反应,主反应速率减慢

压强

改变非气体反应的压强,反应速率不变;

改变反应前后气体体积不变的反应的压强,vv变化幅度相同

浓度

固体和纯液体的浓度为定值,改变固体或纯液体的用量,反应速率不变;

加入固体物质,有可能改变接触面积,反应速率可能加快

无关

气体

恒容容器通入无关气体,压强增大,浓度不变,速率不变;

恒压容器通入无关气体,体积变大,浓度减小,速率减慢

1 (2024·安徽,12)室温下,为探究纳米铁去除水样中的影响因素,测得不同条件下浓度随时间变化关系如下图。

实验序号

水样体积/mL

纳米铁质量/mg

水样初始pH

50

8

6

50

2

6

50

2

8

下列说法正确的是(  )

A.实验中,0~2小时内平均反应速率v()=2.0 mol·L-1·h-1 

B.实验中,反应的离子方程式为:2Fe++8H+===2Fe3++Se+4H2O

C.其他条件相同时,适当增加纳米铁质量可加快反应速率

D.其他条件相同时,水样初始pH越小,的去除效果越好

答案 C

解析实验中,0~2小时内平均反应速率v()==2.0×10-5mol·L-1·h-1 ,A不正确;实验中水样初始pH=8,溶液显弱碱性,发生反应的离子方程式中不能用H+配电荷守恒,B不正确;由实验可知,在相同时间内,实验浓度的变化大,因此其他条件相同时,适当增加纳米铁质量可加快反应速率,C正确;由实验可知,在相同时间内,实验浓度的变化大,因此其他条件相同时,适当减小水样初始pH,的去除效果较好,但是当初始pH太小时,H+浓度太大,纳米铁与H+反应速率加快,会导致与反应的纳米铁减少,因此,初始pH越小,的去除效果不一定越好,D不正确。

2 以基元反应:A(g)+B(g)C(g) ΔH<0为例。分析图像,比较指定点的反应速率大小。

(1)

上图中a、b、c、d四点的反应速率由大到小的顺序为。 

答案vd>va>vb>vc

解析虚线是等温线,由于Td>Ta=Tb=Tcpd=pa>pb>pc,因此vd>va>vb>vc

(2)

上图中T1T2温度的大小关系:,a、b两点的反应速率大小关系:。 

答案T2>T1vb>va

解析先根据达到平衡的时间推导速率的大小(先拐先平速率大),并根据速率的大小推导温度的高低。

2.平衡前后反应速率的比较

平衡前,Q<K,v>v;平衡时,Q=K,v=v;平衡后,Q>K,v<v

3 利用CO2催化加氢可制乙烯,反应为2CO2(g)+6H2(g)C2H4(g)+4H2O(g) ΔH,在两个容积均为1 L的恒容密闭容器中,分别加入2 mol CO2、4 mol H2,分别选用两种催化剂,反应相同时间,测得CO2转化率(α)随反应温度的变化如图所示。

(1)相同温度下发生上述反应,反应的活化能较大的是催化剂,判断的理由:。 

(2)a、b、c、d四点的速率由大到小的顺序为。 

(3)d点状态下,保持其他条件不变,向容器中再加入1 mol CO2与0.5 mol C2H4,v(填>”“<=)v。 

答案 (1) 使用催化剂时,先达到平衡,因此催化剂的活化能比催化剂低 (2)vd>vc>vb>va

(3)>

解析(3)d点处于平衡状态,由题意可列出三段式:

2CO2(g)+6H2(g)2H4(g)+ 4H2O(g)

起始/(mol·L-1)    2400

转化/(mol·L-1)    130.52

平衡/(mol·L-1)    110.52

T5K时该反应的平衡常数K==8,d点状态下,保持其他条件不变,向容器中再加入1molCO20.5molC2H4,Q==4<K,反应正向进行,v>v

3.大学教材信息题——速率与速率常数应用

4 1889年,ArrHenius提出反应速率常数k随温度的变化关系ln k=-+C(RC均为常数)。已知2NO(g)+O2(g)2NO2(g),经历反应1和反应2两步。

反应1:2NO(g)N2O2(g) ΔH1=-46.3 kJ·mol-1

反应2:N2O2(g)+O2(g)2NO2(g) ΔH2=-65.7 kJ·mol-1

两步反应的活化能:Ea1<Ea2。某课题组通过实验绘制出两步反应ln K、ln k的变化曲线如图所示(K表示平衡常数)。

(1)曲线表示的含义:。 

(2)曲线表示的含义:。 

(3)相同条件下,O2、NO浓度的变化对反应速率影响更明显的是。 

答案 (1)曲线②分别表示反应、反应的ln K随温度变化的曲线

(2)曲线为ln k2的变化关系

(3)O2浓度的变化

解析(3)反应2活化能较大,是决速步骤,反应2NO的浓度无关,因而O2浓度的变化对反应速率影响更明显。

通过网盘分享的文件:2026版化学步步高大二轮专题复习【通用版】

链接: https://pan.baidu.com/s/1qU2fefC24s-mrlVQEwKSwQ?pwd=4321 提取码: 4321 

--来自百度网盘超级会员v8的分享

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  1. CONNECT:[ UseTime:0.000476s ] mysql:host=127.0.0.1;port=3306;dbname=i_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001060s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000326s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000268s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000506s ]
  6. SELECT * FROM `set` [ RunTime:0.000225s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000539s ]
  8. SELECT * FROM `article` WHERE `id` = 461076 LIMIT 1 [ RunTime:0.000916s ]
  9. UPDATE `article` SET `lasttime` = 1771058694 WHERE `id` = 461076 [ RunTime:0.001030s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000291s ]
  11. SELECT * FROM `article` WHERE `id` < 461076 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000528s ]
  12. SELECT * FROM `article` WHERE `id` > 461076 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000575s ]
  13. SELECT * FROM `article` WHERE `id` < 461076 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.007104s ]
  14. SELECT * FROM `article` WHERE `id` < 461076 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001159s ]
  15. SELECT * FROM `article` WHERE `id` < 461076 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001059s ]
0.131671s