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【简答题】
碳是人类接触得最早、最多的元素之一. (1)在元素周期表中,碳元素的信息如图所示,碳元素的相对原子质量为 . (2)坚硬无比的金刚石,柔软易碎的石墨,还有神秘的C 60 都是由碳元素组成的 (填“单质”或“化合物”). (3)市场上出售的椰壳活性炭具有疏松多孔的结构,具有极强的 性,可以用于除去装修产生的有害气体. (4)碳酸氢钙【Ca(HCO 3 ) 2 】是一种补钙剂,其中碳元素的化合价为 价. (5)可用盐酸鉴别贝壳的主要成分为CaCO 3 ,用化学方程式表示其原因: .
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