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【简答题】
金属是我们学习的一类重要物质． （1）下列金属制品中（如图1），利用金属导电性的是______（填字母序号）． （2）同学们在探究金属的化学性质时，做了如图2所示的两个实验（已打磨）． ①铁片插入硫酸铜溶液中，铁片表面的现象是______； ②铜片插入硝酸银溶液中，化学的反应方程式是______． 请结合上述两个实验，推测此实验的目的是______． （3）某同学以铁锈为起始反应物，设计实验流程如下（部分反应条件已省略）． ①F的化学式是______； ②B与C反应的化学方程式是______； ③A-H中，能使紫色石蕊溶液变成红色的物质是______（填化学式）．
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