如图为某学习小组探究金属化学性质时所做的四个实验,仔细分析后

如图为某学习小组探究金属化学性质时所做的四个实验,仔细分析后回答下列问题:

1)描述A中的实验现象            .

2)写出A中反应的化学方程式            .

3)要证明CuFeAg的活动性顺序,至少要做的实验是            (填序号).

答案

1铜丝表面附着一层银白色固体,溶液变为蓝色;

2Cu+2AgNo3=2Ag+Cu(No3)2    3AB

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