当前位置:首页>复习资料>【2026版化学步步高大二轮专题复习讲义专题二第5练常见化学用语判断

【2026版化学步步高大二轮专题复习讲义专题二第5练常见化学用语判断

  • 2026-02-16 10:37:56
【2026版化学步步高大二轮专题复习讲义专题二第5练常见化学用语判断

n

5练 常见化学用语判断

[分值:50]

(1~3题,每小题5分,4~8题,每小题7分)

1.(2025·黑吉辽蒙,2)侯氏制碱法突破西方技术垄断,推动了世界制碱技术的发展,其主要反应为NaCl+CO2+NH3+H2O===NaHCO3+NH4Cl。下列有关化学用语或说法正确的是(  )

A.CO2的电子式:

B.H2O的空间结构:直线形

C.NH4Cl的晶体类型:离子晶体

D.溶解度:NaHCO3>NH4HCO3

答案 C

解析 CO2的电子式为2O中O原子的价层电子对数为2+=4,孤电子对数为2,故H2O的空间结构为V形,B错误;根据题给反应可知,NaHCO3结晶析出,则NaHCO3的溶解度小于NH4HCO3的溶解度,D错误。

2.(2024·黑吉辽,2)下列化学用语或表述正确的是(  )

A.中子数为1的氦核素He

B.SiO2的晶体类型:分子晶体

C.F2的共价键类型:pp σ键

D.PCl3的空间结构:平面三角形

答案 C

解析 中子数为1He核素其质量数为1+2=3,故应表示为He,A错误;两个F原子中2p轨道单电子相互重叠形成ppσ键,C正确;PCl3的中心原子价层电子对数为4,存在1个孤电子对,其VSEPR模型为四面体形,PCl3的空间结构为三角锥形,D错误。

3.(2025·河北,5)下列化学用语表述正确的是(  )

A.中子数为12的氖核素Ne

B.氯化镁的电子式:

C.甲醛分子的球棍模型:

D.C的价层电子对互斥模型:

答案 C

解析氖原子的质子数为10,故中子数为12的氖核素可表示为Ne,A错误;氯化镁为离子化合物,电子式为,B错误;甲醛分子中C原子采取sp2杂化,球棍模型为,C正确;C的中心原子C的价层电子对数为3+=3,无孤电子对,故C的价层电子对互斥模型为平面三角形,D错误。

4.(2025·陕晋青宁,2)下列化学用语或图示表达正确的是(  )

A.CS2的电子式为

B.基态Be原子的价电子排布式为2s22p2

C.C2H2的球棍模型为

D.反2丁烯的结构简式为

答案 A

解析 CS2的结构与CO2的结构类似,故CS2的电子式为2,B错误;题图为乙炔的空间填充模型,C错误;反2丁烯的结构简式为,D错误。

5.(2025·内蒙古二模)下列关于反应NCl3+3H2O===NH3+3HClO中所涉及的物质的化学用语或叙述正确的是(  )

A.HClO的电子式为

B.NH3是极性分子

C.H2O中含sp型σ键

D.NCl3的VSEPR模型为

答案 B

解析 HClO的电子式为,A错误;NH3中心原子的价层电子对数为4,孤电子对数为1,空间结构为三角锥形,是极性分子,B正确;H2O中存在H的s轨道和O的sp3杂化轨道形成的ssp3型σ键,C错误;NCl3中心原子的价层电子对数为4,孤电子对数为1,其VSEPR模型为,D错误。

6.(2025·大连一模)下列化学用语或表述正确的是(  )

A.Na2S形成过程:

B.H2O2分子类型:非极性分子

C.考古时用于测定文物年代的碳核素C

D.激发态H原子的轨道表示式:

答案 A

解析 Na2S是离子化合物,钠原子最外层有1个电子,硫原子最外层有6个电子,2个钠原子分别失去1个电子给1个硫原子,形成Na+S2-,A 正确;H2O2分子结构不对称,OO非极性键和OH极性键不共面,正、负电中心不重合,是极性分子,B错误;考古时用于测定文物年代的碳核素是C,C错误;氢原子只有1个电子,基态时在1s轨道,激发态时电子跃迁,但是不存在1p轨道(第一电子层只有1s轨道 ),该轨道表示式错误,D错误。

7.(2025·河南模拟)下列化学用语不正确的是(  )

A.H2S的电子式:

B.基态Cl原子的价层电子轨道表示式:

C.3,3二甲基1戊烯的键线式:

D.任何能层的s能级的电子云轮廓图形状都相同

答案 A

8.(2025·沈阳模拟)下列化学用语或图示表述正确的是(  )

A.SiO2的电子式:

B.SO2的VSEPR模型:

C.天然橡胶的结构简式:

D.sp2杂化轨道示意图:

答案 C

解析二氧化硅为共价晶体,Si原子的周围有4O原子,O原子周围有2Si原子,在空间形成网状结构,不存在单个分子,也就没有电子式,A错误;二氧化硫分子中硫原子的价层电子对数为2+=3,孤电子对数为1,分子的VSEPR模型为错误;异戊二烯的结构简式为,天然橡胶的主要成分是顺式聚异戊二烯(双键上的取代基甲基和氢位于同侧),其结构简式为正确;sp2杂化轨道间夹角为120°,呈平面三角形,图中夹角为180°,表示的是sp杂化轨道示意图,D错误。

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  1. CONNECT:[ UseTime:0.000975s ] mysql:host=127.0.0.1;port=3306;dbname=i_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001475s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000657s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000668s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001322s ]
  6. SELECT * FROM `set` [ RunTime:0.000688s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001353s ]
  8. SELECT * FROM `article` WHERE `id` = 461145 LIMIT 1 [ RunTime:0.001142s ]
  9. UPDATE `article` SET `lasttime` = 1771233350 WHERE `id` = 461145 [ RunTime:0.027387s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.007213s ]
  11. SELECT * FROM `article` WHERE `id` < 461145 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001317s ]
  12. SELECT * FROM `article` WHERE `id` > 461145 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.010213s ]
  13. SELECT * FROM `article` WHERE `id` < 461145 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000887s ]
  14. SELECT * FROM `article` WHERE `id` < 461145 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001093s ]
  15. SELECT * FROM `article` WHERE `id` < 461145 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001147s ]
0.136951s