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2026初中化学中考教材实验整合(二)

  • 2026-06-02 12:36:55
2026初中化学中考教材实验整合(二)
四、与压强有关的实验
1.化学实验中的气压变化
2.密闭容器中气压变化的原因

压强

变化

原因

物质组合

注意事项

密闭容器中压强增大

生成气体

O2CO2的实验室制取; 

①压强变化后,气体或液体总是向着气压小的方向运动,主要表现为:液柱(或液面)的移动或气球(或软塑料瓶)的变化。

②由温度引起的压强变化可恢复,而由气体体积引起压强变化不可恢复。

②活泼金属与稀酸反应

③碳酸盐、碳酸氢盐与酸反应

H2CO3分解

⑤电解水

放出热量

NaOH固体溶解 

②浓硫酸稀释

③氧化钙与水反应

④中和反应

⑤活泼金属与稀酸反应

密闭容器中压强减小

消耗气体

①空气中氧气含量的测定

②金属单质与O2反应

③铁的锈蚀;

CO2NH3HCISO2,等溶于水;

CO2与碱溶液反应等

吸收热量

NH4NO3固体溶于水

3.常见装置
4.针对性训练
4.巩固性练习
(1)如图1,检查装置气密性的方法是先将导管的一端浸没在水中,然后用手紧握试管,观察到  ,说明装置气密性良好。一段时间后松开手,玻璃导管中水面上升,形成了一段稳定的水柱,出现此现象的原因是   。

(2)如图2,检查装置气密性的方法是先用弹簧夹夹紧胶皮管,再向长颈漏斗中注入水,使水浸没长颈漏斗下端,并使漏斗中的液面高于锥形瓶的液面,静置一段时间,观察到  ,说明装置气密性良好。

(3)如图3,打开分液漏斗的活塞时,可观察到的现象是  ,出现该现象的原因是。

(4)如图4可用于实验室制取二氧化碳,石灰石放在多孔塑料板上,该装置的优点是   ,使反应停止的具体操作是用弹簧夹夹住胶皮管,生成的二氧化碳使    从而达到固液分离的目的,使反应停止。

(5)如图5将胶头滴管中的水滴到集气瓶中,可观察到U型管中的现象是      ,出现该现象的原因是    。

(6)如图6将胶头滴管中的氢氧化钠浓溶液滴入集气瓶中,振荡,可观察到小气球,发生反应的化学方程式为   ;要使小气球恢复原来的状态,可向集气瓶中滴入(填试剂名称)。

(7)如图7所示的装置中,一段时间后,塑料软管中的液面变化情况是,出现该现象的原因是   。

(8)如图8所示为趣味喷泉实验,实验中先在圆底烧瓶中集满NH3,将胶头滴管中的水注入圆底烧瓶中,再打开弹簧夹,观察到圆底烧瓶中形成红色喷泉,出现该现象的原因是 。

(9)如图9所示,向装有NHNO,固体的试管中加入少量水,一段时间后,U型管中的液面变化情况是,出现该现象的原因是  。

(10)如图10所示,将胶头滴管中的水注入集气瓶中,观察到右侧U型管中液面出现如图所示a端比b端低的现象,出现该现象的原因是   。

参考答案:

(1)导管口有气泡冒出    松手后试管内气压减小,水在大气压作用下被压入导管中,装置内外压强平衡后,水柱稳定不变

(2)长颈漏斗内水柱不下降

(3)充气气球变瘪,导管中的红墨水向左移动     H2O2滴入,在Mn02的催化下迅速分解放出气体使瓶内压强增大

(4)可随时控制反应的发生与停止      试管内压强增大,将试管中的液体压入长颈漏斗中

(5)红墨水左低右高     氧化钙与水反应放热,使集气瓶中压强增大

(6)变瘪       CO2+2NaOH==Na2CO3+H20      稀盐酸

(7)红墨水左高右低         矿泉水瓶中铁钉锈蚀消耗氧气,使装置内压强减小

(8)氨气溶于水,导致烧瓶中的气压减小,在外界大气压作用下,烧杯中的液体进入烧瓶:氨气和水反应生成氨水,氨水显碱性,能使酚酞溶液变红色

(9)红墨水左高右低硝酸铵溶于水吸热,使集气瓶中压强减小

(10)氢氧化钠固体溶于水放热,使装置内压强增大

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  1. CONNECT:[ UseTime:0.000991s ] mysql:host=127.0.0.1;port=3306;dbname=c_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001416s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000672s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000600s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001234s ]
  6. SELECT * FROM `set` [ RunTime:0.000463s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001248s ]
  8. SELECT * FROM `article` WHERE `id` = 468208 LIMIT 1 [ RunTime:0.000850s ]
  9. UPDATE `article` SET `lasttime` = 1781104620 WHERE `id` = 468208 [ RunTime:0.011626s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000538s ]
  11. SELECT * FROM `article` WHERE `id` < 468208 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000909s ]
  12. SELECT * FROM `article` WHERE `id` > 468208 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000912s ]
  13. SELECT * FROM `article` WHERE `id` < 468208 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001565s ]
  14. SELECT * FROM `article` WHERE `id` < 468208 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.008987s ]
  15. SELECT * FROM `article` WHERE `id` < 468208 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008830s ]
0.131211s