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人教版新教材九年级化学上册第三单元拓展性课题中有氢气与空气混合爆炸的实验,通常的实验方法是:取一个去盖且底部穿有小孔的塑料筒(或易拉罐),用纸团堵住小孔,用排水法收集满一筒氢气,倒置时筒下垫木条,使筒的下边缘一端稍稍抬起(如图1(1)),拿掉堵小孔的纸团,用燃着的木条在小孔处点火,注意观察有什么现象发生,在此期间要注意安全,人要离远些。
The third edition of the new teaching materials of the People’s Education Press teaches the experiment of mixed explosion of hydrogen and air in the third unit of expansion. The usual experimental method is: take a plastic tube (or can) with a small hole at the bottom and use it. The paper mass plugs the small hole, collects a full cylinder of hydrogen by the drainage method, and inverts the tube to insert the wood strip so that the bottom edge of the tube is lifted slightly (as shown in Fig. 1(1)), and the paper mass with the small hole is removed. Fire with a burning wood stick at the small hole, pay attention to observe what happens. During this period, pay attention to safety, and people must be far away.