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初三科学：上册课本第一章活动3 (pg8)

Quiz by CHEW HOCK LEONG周福隆

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4 questions
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  • Q1
    向盛有少量氧化铜粉末的试管中加入2mL稀盐酸，略微加热。你看到什么现象？
    黑色的氧化铜粉末被溶解，溶液变成澄清的翠绿色溶液。
    Video
    60s
  • Q2
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    Type an Answer
    45s
  • Q3
    取一枚生锈的铁钉（铁锈的主要成分是氧化铁(III)），观察它的颜色。小心地让生锈的铁钉沿着试管壁滑到试管底部，向试管中滴加少量稀盐酸，振荡，如图1-12所示。过一会儿取出铁钉，用水冲洗干净。铁钉表面和溶液颜色各发生了什么变化？
    铁钉表面铁锈逐渐溶解消失，溶液呈黄色。
    Video
    60s
  • Q4
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    45s

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