初三科学：上册第三章钾与钠与水反应
Quiz by CHEW HOCK LEONG周福隆
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9 questions
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- Q1实验影片中，钠与钾与水反应，何者较为剧烈？钾钠Video30s
- Q2实验影片中，水中加入了什么酸碱指示剂？甲基橙酚酞广用指示剂石蕊试液30s
- Q3实验影片中，钠或钾与水反应后，溶液变什么色？蓝色红色无色黄色30s
- Q4钠或钾与水反应后，所生成的溶液是什么酸性还是碱性？酸性碱性30s
- Q5实验影片中，钠与水反应会否产生气体？否会Video30s
- Q6实验影片中，钠与水的反应时熔成一个小球，说明这是吸热反应还是放热反应？吸热反应放热反应30s
- Q7实验影片中，钠浮在水面上，说明钠的密度比水大还是比水小？钠密度比水大钠密度比水小30s
- Q8实验影片中，钠与水反应产生什么气体？氮气氧气氢气二氧化碳Video30s
- Q9钠或钾与水会发生剧烈的反应，因此钠或钾引起的火焰，能否用水将其扑灭？不能，应该使用沙土盖灭能30s