第29章 哎,又是一道化学送分题(1 / 1)
solid elements,coded as g,j and q,belong to the same period of the periodic table,and form oxides with the following properties:
go3 reacts with water to form a strongly acidic solution,
j2o3 reacts with strong acids and strong alkalis,
q2o reacts with water to form a strongly alkaline solution.
(a)state which oxide would be described as amphoteric.(1 mark)
(b)state,giving reasons,which of g,j or q is most electronegative.(2 mark)
(c)state,giving reasons,which oxide is molecular.(3 mark)
解答:g为s(硫),j为al(铝),q为na(钠)。
(a)al2o3为两性氧化物,既可与强酸反应,又可与强碱反应。
(b)一般来说,周期表从左到右,元素的电负性逐渐变大,而从上到下,元素的电负性则逐渐变小,所以电负性最大的是硫元素,其次是铝,最小的是钠。
(c)常温下so3为气体,al2o3为固体,na2o为白色略黄状粉末,所以分子型氧化物是so3。
备注:原来经历过的事情都不会忘记;说忘记的,是一时半会记不起罢了,但仔细去回想却还是能想起来的,比如曾学到的知识、遇过的人以及此时囊中羞涩,兜里没钱,穷到吃土。
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