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高中化学试题解析382

高中化学试题解析382

高中化学试题解析382

1. 用硫酸和NaN3可制备一元弱酸HN3。下列说法错误的是

A. NaN3的水溶液显碱性

B. N3-的空间构型为V形

C. NaN3为含有共价键的离子化合物

D. N3-的中心N原子所有价电子均参与成键

答案:B

分析:

A项,NaN3是强碱(NaOH)和弱酸(HN3)形成的盐,其阴离子N3-水解使溶液呈碱性。

B项,N3-与CO2是等电子体,两者结构相似 ,其中心原子均为sp杂化,其空间构型均为直线形。也可计算其中心N原子的价层电子对数,σ键电子对数为2,孤电子对数为(62×3)/2=0,则价层电子对数为2,发生sp杂化,空间构型为直线形。

C项,NaN3为离子化合物,Na+与N3-通过离子键结合,N3-内部的N原子之间通过共价键结合。

D项,从B选项的分析知,中心N原子与两个N原子形成两个共价双键,无孤电子对,说明其最外层的5个电子均参与成键。


2. 物质性质与组成元素的性质有关,下列对物质性质差异解释错误的是

答案:A

分析:

A项,H2O沸点高于H2S的主要原因是H2O分子间存在氢键、H2S分子间不存在氢键,电离能与沸点无直接关系》

B项,HClO酸性强于HBrO是因为Cl的电负性大于Br,吸电子效应更强,使O—-H键极性更强,更容易电离出H+

C项,金刚石与晶体硅均为共价晶体,晶体结构相似。金刚石硬度大于晶体硅是因为C原子半径小于Si,C—C键长更短键能更大,共价结构更稳定。

D项,MgO和NaF均为离子晶体,熔点取决于其晶格能的大小,离子半径越小、离子电荷越多,其晶格能一般较大,其熔点更高。MgO熔点高于NaF是因为Mg2+和O2−的电荷高于Na+和F,且其阴、阳离子的半径对应较小,故离子键更强,晶格能更大。

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  1. CONNECT:[ UseTime:0.001048s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001657s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000744s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000700s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001477s ]
  6. SELECT * FROM `set` [ RunTime:0.000609s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001577s ]
  8. SELECT * FROM `article` WHERE `id` = 810842 LIMIT 1 [ RunTime:0.001340s ]
  9. UPDATE `article` SET `lasttime` = 1782630414 WHERE `id` = 810842 [ RunTime:0.016645s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000469s ]
  11. SELECT * FROM `article` WHERE `id` < 810842 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000623s ]
  12. SELECT * FROM `article` WHERE `id` > 810842 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001451s ]
  13. SELECT * FROM `article` WHERE `id` < 810842 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000775s ]
  14. SELECT * FROM `article` WHERE `id` < 810842 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000620s ]
  15. SELECT * FROM `article` WHERE `id` < 810842 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001096s ]
0.138125s