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（11分）Ⅰ．分类法是化学学习的一种十分有效的方法，它可以使我们从不同角度对同一知识做更加深入的了解，人们根据不同的标准，即使同一物质也可能被划在不同的类别中。现有如下物质①MgCl 2 ②HCl ③SO 2 ④ NO 2 ⑤K 2 CO 3 ⑥ Cl 2 ⑦CaO ⑧ NaOH 请根据下列标准，对上述物质进行分类： （1）既含离子键又含共价键的物质是 （填代号，下同）。 （2）只含共价键且为非电解质的是 。 （3）含有共价键的化合物是 。 Ⅱ．恒容的密闭容器中加入A、B、C三种气体，如图所示是一定条件下三种气体的物质的量随时间的变化情况。 （1）写出该密闭容器发生反应的化学方程式为 。 （2）2分钟后A、B、C各物质的量不再随时间的 变化而变化，其原因是 ____ 。 （3）下列情况能说明该反应达到化学反应限度的是 。 A．该容器的压强不再发生变化； B．单位时间内生成A的物质的量与生成C的物质的量相同； C．该容器中气体的密度不再改变； D．容器中A的物质的量与C的物质的量相同
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