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以食盐(NaCl)为原料可以得到金属钠(Na)和氢氧化钠(NaOH,俗称烧碱)。先做点补充:在得到金属钠的同时得到了氯气(Cl_2);在得到氢氧化钠的同时也得到氯气,还得到氢气(H_2)。应该指出,氢气和氯气能够发生反应。氢气可以在空气里点燃或者爆炸,反应的产物是水,可用化学方程式(后面将学到)简单地表述为2H_2+O_2=2H_2O。这个化学方程式的微观信息是,每2个氢分子和1个氧分子反应生成2个水分子。为什么参加反应的氢气分子数和氧气分子数是2:1呢?因为水分子是由2个氢原子和1个氧原子构成的。若把空气改换成氯气呢?氢气在氯气流里能够点燃吗?或者反过来,氯气在氢气流里能够点燃
With salt (NaCl) as raw material can be metal sodium (Na) and sodium hydroxide (NaOH, commonly known as caustic soda). First make a point to add: get sodium chloride at the same time get chlorine (Cl_2); get sodium hydroxide also get chlorine, also get hydrogen (H_2). It should be noted that hydrogen and chlorine can react. Hydrogen can be ignited or exploded in the air, and the product of the reaction is water, which can be described simply as 2H_2 + O_2 = 2H_2O using the chemical equation (to be learned later). The microscopic information of this chemical equation is that every two hydrogen molecules and one oxygen molecule react to form two water molecules. Why participate in the reaction of hydrogen molecules and oxygen molecules is 2: 1? Because the water molecule is composed of two hydrogen atoms and one oxygen atom. If the air is changed to chlorine gas, can the hydrogen ignite in the chlorine gas stream or, in turn, the chlorine gas can ignite in the hydrogen stream?