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在2014年高考试卷中,钠及其化合物多次出现,成为2014年高考的新亮点,现将其总结如下。一、对钠单质的考查例1(北京卷第7题)下列金属中,表面自然形成的氧化层能保护内层金属不被空气氧化的是()。A.K B.Na C.Fe D.Al解析K、Na的化学性质非常活泼,在空气中极易被氧气氧化,A、B错误;Fe在空气中易被氧气氧化生成一层疏松的Fe2O3氧化膜,无法保护内部金属,C错误;Al在空气中易被氧气氧化生成一层致密的Al2O3氧化膜,从而保护内部的Al不被腐蚀,D正确。答案:D。例2(北京卷第9题)下列解释事实的方程式不正确的是()。A.测0.1mol/L氨水的pH为11:NH3·H2O
In 2014 college entrance examination papers, sodium and its compounds appear many times, become the 2014 college entrance examination of the new highlights, now summarized as follows. A test of sodium simple example 1 (Beijing Volume 7) The following metals, the surface of the oxide layer is naturally formed to protect the inner metal is not air oxidation (). AK B.Na C.Fe D. Al analytical K, Na is very active in the chemical nature of the air easily oxidized by oxygen, A, B error; Fe in the air easily oxidized by oxygen to form a layer of loose Fe2O3 oxide film , Can not protect the internal metal, C error; Al in the air easily oxidized by oxygen to generate a dense layer of Al2O3 oxide film, thereby protecting the internal Al is not corroded, D correct. Answer: D. Example 2 (Beijing Volume 9) The following is not correct to explain the fact that the formula (). A. measure the pH of 0.1mol / L ammonia is 11: NH3 · H2O