当前位置:首页>复习资料>【2026版化学高考步步高大二轮专题复习讲义浙江专用版专题四微点突破4化学反应速率与化学平衡图像分析

【2026版化学高考步步高大二轮专题复习讲义浙江专用版专题四微点突破4化学反应速率与化学平衡图像分析

  • 2026-03-27 14:41:19
【2026版化学高考步步高大二轮专题复习讲义浙江专用版专题四微点突破4化学反应速率与化学平衡图像分析

1.(2022·浙江1月选考,19)在恒温恒容条件下,发生反应A(s)+2B(g)3X(g),c(B)随时间的变化如图中曲线甲所示。下列说法不正确的是(  )

A.从a、c两点坐标可求得从a到c时间间隔内该化学反应的平均速率

B.从b点切线的斜率可求得该化学反应在反应开始时的瞬时速率

C.在不同时刻都存在关系:2v(B)=3v(X)

D.维持温度、容积、反应物起始的量不变,向反应体系中加入催化剂,c(B)随时间变化关系如图中曲线乙所示

答案 C

解析 b点处切线的斜率是此时刻物质浓度除以此时刻时间,为B的瞬时速率,B正确;由化学反应速率之比等于化学方程式计量数之比分析,在不同时刻都存在关系:3v(B)=2v(X),C不正确;维持温度、容积不变,向反应体系中加入催化剂,平衡不移动,反应速率增大,达到的新的平衡状态与原来的平衡状态相同,D正确。

2.(2025·安徽,11)恒温恒压密闭容器中,t=0时加入A(g),各组分物质的量分数x随反应时间t变化的曲线如图(反应速率v=kx,k为反应速率常数)。

下列说法错误的是(  )

A.该条件下=

B.0~t1时间段,生成M和N的平均反应速率相等

C.若加入催化剂,k1增大,k2不变,则x1xM,平衡均变大

D.若A(g)M(g)和A(g)N(g)均为放热反应,升高温度则xA,平衡变大

答案 C

解析反应达到平衡时,正、逆反应速率相等,则对于反应M(g)(g)存在关系式:k-1·xM,平衡=k1·xA,平衡,对于反应A(g)(g)存在关系式:k-2·xN,平衡=k2·xA,平衡,两式联立可得=正确;起始时,xMxN均为0,t1时,xM=xN,则0~t1时间段,生成MN的平均反应速率相等,B正确;催化剂不影响平衡移动,故xM,平衡不变,C错误;A(g)M(g)和A(g)N(g)均为放热反应,则升高温度,平衡均逆向移动,故xA,平衡变大,D正确。

3.(2025·诸暨高三模拟)纳米碗C40H10是一种奇特的碗状共轭体系。高温条件下,C40H10可以由C40H20分子经过连续5步氢抽提和闭环脱氢反应生成。C40H20(g)C40H18(g)+H2(g)的反应机理和能量变化如图所示,其中最后一个基元反应的逆反应活化能为22.8 kJ·mol-1

下列说法不正确的是(  )

A.C40H20(g)C40H18(g)+H2(g)反应的ΔH=+128 kJ·mol-1

B.上述图示历程中包括3个基元反应,且第一个反应速率最快

C.根据上述反应机理,C40H10纳米碗中含6个五元环

D.升高温度和增大压强均既能增大生成C40H10的反应速率,又能提高反应物的平衡转化率

答案 D

解析由题干反应历程图可知,C40H20(g)40H18(g)+H2(g)的ΔH=+128kJ·mol-1,A正确;该反应包含3个基元反应,分别为C40H20+H··C40H19+H2,·C40H1940H19'·C40H19'C40H18+H·,其中第一个反应的活化能最小,反应速率最快,B正确;由C40H20的结构可知其中含有1个五元环,10个六元环,每脱两个氢形成一个五元环,则C40H10总共含有6个五元环,10个六元环,C正确;结合A的分析可知,生成C40H10的反应是气体分子数增大的吸热反应,则增大压强,平衡逆向移动,反应物转化率减小,D错误。

4.(2025·浙江高三普通高校招生模拟)已知Cl2溶于水存在以下平衡:

. Cl2+H2OHCl+HClO  K1=4.0×10-4

. Cl-+Cl2K2=0.20

298 K时,测得Cl2在不同浓度的盐酸中的溶解度(见表)和盐酸浓度与溶解Cl2及含氯微粒变化关系(见图)。下列说法不正确的是(  )

盐酸浓度/(mol·L-1)

0.200

0.500

1.000

2.000

3.000

4.000

Cl2溶解度/(mol·L-1)

0.062 0

0.063 0

0.066 5

0.740

0.083 0

0.091 0

A.盐酸浓度越大,Cl2溶解度越大

B.当c(HCl)=1.000 mol·L-1时,溶液中c(Cl2)=0.053 0 mol·L-1,此时c(C)<c(HClO)

C.除去Cl2中的HCl气体时,为降低Cl2的溶解应使用浓NaCl溶液效果更佳

通过网盘分享的文件:word讲义【更新联系:lymsummers】等2个文件

链接: https://pan.baidu.com/s/10SY5y2aMVnchrA2xx-JUuQ?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:0.000516s ] mysql:host=127.0.0.1;port=3306;dbname=i_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000786s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000295s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000249s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000541s ]
  6. SELECT * FROM `set` [ RunTime:0.000209s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000602s ]
  8. SELECT * FROM `article` WHERE `id` = 462522 LIMIT 1 [ RunTime:0.001109s ]
  9. UPDATE `article` SET `lasttime` = 1774764289 WHERE `id` = 462522 [ RunTime:0.002348s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000276s ]
  11. SELECT * FROM `article` WHERE `id` < 462522 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000493s ]
  12. SELECT * FROM `article` WHERE `id` > 462522 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000450s ]
  13. SELECT * FROM `article` WHERE `id` < 462522 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001753s ]
  14. SELECT * FROM `article` WHERE `id` < 462522 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001773s ]
  15. SELECT * FROM `article` WHERE `id` < 462522 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002158s ]
0.080955s