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七微点突破7分子极性氢键

【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七微点突破7分子极性氢键

  • 2026-03-25 18:22:17
【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七微点突破7分子极性氢键

一、分子极性

1.极性分子与非极性分子的判断

2.分子极性对物质溶解性的影响

相似相溶规律:非极性溶质一般能溶于非极性溶剂,极性溶质一般能溶于极性溶剂。相似相溶还适用于分子结构的相似性,如在水中溶解度:乙醇>戊醇。

对点训练

1.在H2S、BF3、PCl3、CS2、CCl4、C2H4、N2H4、P4、HCN、苄氯()分子中:

(1)以非极性键结合的非极性分子是。 

(2)以极性键相结合,具有直线形结构的非极性分子是。 

(3)以极性键相结合,具有直线形结构的极性分子是。 

(4)以极性键相结合,具有三角锥形结构的极性分子是。 

(5)以极性键相结合,具有正四面体结构的非极性分子是。 

(6)以极性键相结合,具有V形结构的极性分子是。 

(7)以极性键相结合,具有平面正三角形结构的非极性分子是。 

(8)既含极性键又含非极性键的非极性分子是。 

(9)既含极性键又含非极性键的极性分子是。 

答案 (1)P4 (2)CS2 (3)HCN (4)PCl3 (5)CCl4 (6)H2S (7)BF3 (8)C2H4 (9)N2H4、苄氯

2.下列现象中,不能用相似相溶规律解释的是(填字母)。 

A.HCl易溶于H2O

B.Cl2易溶于NaOH溶液

C.Br2易溶于CCl4

D.I2易溶于CS2

答案 B

解析 HCl是极性分子,H2O是极性溶剂,HCl易溶于H2O能用相似相溶规律解释,A不符题意;Cl2易溶于NaOH溶液主要是Cl2NaOH溶液反应所致,不能用相似相溶规律解释,B符合题意;Br2是非极性分子,CCl4是非极性溶剂,Br2易溶于CCl4能用相似相溶规律解释,C不符题意;I2是非极性分子,CS2是非极性溶剂,I2易溶于CS2能用相似相溶规律解释,D不符题意。

二、氢键

1.氢键的存在与形成

氢键通常用X—HY表示,氢键强弱与X和Y的吸引电子的能力有关,一般X、Y元素吸引电子能力越强(即电负性越大),则氢键越强。氢键强弱变化顺序为F—HF>O—HO>O—HN>N—HN。

2.氢键的类型

分子间氢键使物质熔、沸点升高,如;分子内氢键,如。

3.与氢键有关的答题模板

(1)熔、沸点:X分子与X分子之间存在氢键,导致其熔、沸点偏高。

(2)溶解度:X分子与水之间存在氢键,导致X在水中的溶解度偏大。

对点训练

氢键与物质性质的关系问题解答。

(1)苯胺()与甲苯()的相对分子质量相近,但苯胺的熔点(-5.9 )、沸点(184.4 )分别高于甲苯的熔点(-95.0 )、沸点(110.6 ),原因是。 

答案 苯胺分子间存在氢键,而甲苯分子间仅存在范德华力,苯胺的熔点和沸点显著高于甲苯

(2)[2024·山东,16(4)]FDCA()的熔点远大于HMF(),除相对分子质量存在差异外,另一重要原因是。 

答案 FDCA形成的分子间氢键更多

(3)的沸点比高,原因是。 

答案 形成分子内氢键,而形成分子间氢键,分子间氢键使分子间作用力增大,沸点升高

(4)已知苯酚()具有弱酸性,其Ka=1.1×10-10;水杨酸第一级电离形成的离子能形成分子内氢键。据此判断,相同温度下,电离平衡常数Ka2(水杨酸)(填><)Ka(苯酚),其原因是。 

答案 < —COO-与—OH形成分子内氢键,使其更难电离出H+

(5)硼酸晶体是片层结构,其中一层的结构如图所示。硼酸在冷水中溶解度很小,但在热水中较大,原因是。 

答案 晶体中硼酸分子间以氢键缔合在一起,难以溶解;加热时,晶体中部分氢键被破坏,硼酸分子与水分子形成氢键,溶解度增大

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:0.000479s ] mysql:host=127.0.0.1;port=3306;dbname=i_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000674s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000303s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000260s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000469s ]
  6. SELECT * FROM `set` [ RunTime:0.000198s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000496s ]
  8. SELECT * FROM `article` WHERE `id` = 462394 LIMIT 1 [ RunTime:0.000434s ]
  9. UPDATE `article` SET `lasttime` = 1774753077 WHERE `id` = 462394 [ RunTime:0.003052s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000963s ]
  11. SELECT * FROM `article` WHERE `id` < 462394 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000547s ]
  12. SELECT * FROM `article` WHERE `id` > 462394 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000442s ]
  13. SELECT * FROM `article` WHERE `id` < 462394 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001492s ]
  14. SELECT * FROM `article` WHERE `id` < 462394 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000613s ]
  15. SELECT * FROM `article` WHERE `id` < 462394 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000817s ]
0.081253s