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且说1807年,英国年轻的化学家戴维,用强大的伏特电池电解木灰和苏打,得到了两种神奇的金属元素钾和钠。这两种银白色的金属与人们熟知金属元素金、银、铜、铁、铅、锌、锡、镍等,性质可是大大的不同:它们很软,软得像豆腐,用水果刀就能轻而易举地切下来;比水还要轻;能和水发生激烈反应,生成氢气、苛性钾或苛性钠。正因为这样,钾、钠平时只能放在煤油里,不能放在水里;它们的性质非常活跃,在空气中很容易被氧化(与氧化合),生成一层白色的氧化膜(氧化钾或氧化钠)。能与氯气猛
And in 1807, David Young, a young British chemist, electrolyzed wood ash and soda with a powerful volt cell and got two kinds of magical metallic elements, potassium and sodium. These two silver-white metals are quite different in nature from the familiar metal elements of gold, silver, copper, iron, lead, zinc, tin, nickel, etc. They are soft and soft like tofu, Cut off; lighter than water; can react violently with water to produce hydrogen, caustic potash, or caustic soda. Because of this, potassium and sodium are usually only placed in kerosene, can not be placed in the water; their properties are very active in the air is very easy to be oxidized (with oxygen) to generate a layer of white oxide film (potassium oxide Or sodium oxide). With fierce chlorine