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轿车安全气囊,全靠化学反应救命!

  • 2026-08-04 05:40:43
轿车安全气囊,全靠化学反应救命!
   大家都知道，轿车前台装有安全气囊，当撞击险情来临时，安全气囊打开，防止二次撞伤。好多人认为安全气囊中存储大量高压空气，碰撞时直接释放。事实并非如此，气囊快速打开的一瞬间，全靠一场化学反应救命。今天我们从九年级化学角度，揭开安全气囊的秘密。
一、九年级化学试题：
   这道题以轿车安全气囊问题为情景，解题依据就是质量守恒定律，化学反应前后原子的种类、数目、质量不变，所以N、H、O原子反应前后数目不变确定答案为A，即安全气囊中含有硝酸铵，当轿车受到猛烈撞击时，瞬间发生反应，释放大量的氮气N₂，从而保护人体安全。
二、早期安全气囊中物质叠氮化钠：
   安全气囊中的物质是叠氮化钠NaN₃，常温条件下叠氮化钠性质稳定；受到猛烈撞击时，迅速发生分解反应：
2NaN₃= 2Na + 3N₂↑（条件是撞击）
   由于这个反应会产生金属钠，这就在安全气囊中搭配其他物质吸收金属钠，比较麻烦且成本高。所以现在轿车的安全气囊中主要是硝酸铵这种物质。
三、以上两个反应均产生大量氮气来保护生命，为什么选择氮气？
  1. 氮气化学性质稳定、无毒、无味、不燃烧也不支持燃烧，安全性高；
  2. 反应物质量少，就能生成很大体积的气体；
  3. 反应可控制，正常行驶时保持稳定不反应，只有在猛烈撞击时发生反应。
四、安全气囊小练习：
1.汽车安全气囊内叠氮化钠撞击发生反应：2NaN₃=2Na+3X
（1）X的化学式为____。
（2）该反应属于_____反应。
（3）气囊内填充的气体是________。
（4） 使用该气体的原因：_________。
2.关于安全气囊化学反应说法正确的是（）
A. 反应生成氧气充满气囊
B. NH₄NO₃撞击分解属于物理变化
C. 反应前后元素种类不变
D. 生成的金属钠化学性质稳定
化学与生活紧密联系，学好化学，走遍天下都不怕！你还知道生活中有哪些化学反应？欢迎留言互动！
#化学与生活
#轿车安全气囊
#轿车安全气囊，靠化学反应救命！
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  1. CONNECT:[ UseTime:0.001124s ] mysql:host=127.0.0.1;port=3306;dbname=e_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001841s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000687s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000607s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001141s ]
  6. SELECT * FROM `set` [ RunTime:0.000511s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001435s ]
  8. SELECT * FROM `article` WHERE `id` = 537314 LIMIT 1 [ RunTime:0.002509s ]
  9. UPDATE `article` SET `lasttime` = 1786805279 WHERE `id` = 537314 [ RunTime:0.010158s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000533s ]
  11. SELECT * FROM `article` WHERE `id` < 537314 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001079s ]
  12. SELECT * FROM `article` WHERE `id` > 537314 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001012s ]
  13. SELECT * FROM `article` WHERE `id` < 537314 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001650s ]
  14. SELECT * FROM `article` WHERE `id` < 537314 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004549s ]
  15. SELECT * FROM `article` WHERE `id` < 537314 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.010279s ]
0.208384s