下列实验现象的描述与实际相符合的是_刷题宝

题干

下列实验现象的描述与实际相符合的是（）

A：将二氧化碳通入紫色石蕊溶液，溶液由紫色变成蓝色

B：硫在空气中燃烧，发出明亮的蓝紫色火焰

C：细铁丝在氧气中燃烧，火星四射，生成黑色固体

D：把铁丝插入硫酸铜溶液中，溶液由蓝色变成无色

上一题下一题 0.0难度选择题更新时间:2018-09-18 11:38:02

答案(点此获取答案解析）

C

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环境问题的实质是

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有一块铁的“氧化物”样品，用140mL 5.0mol·L^－１盐酸恰好将之完全溶解，

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Dear Sam，
Thank you for your email．
I’m visiting（参观）Beijing with my mother and my sister Kate now．My father John and my brother David don’t come with us．They are in New York．My father is a doctor at a hospital and he doesn’t have time．My brother is a middle school student and he has to study his lessons．There are many people in China．They are very nice and l speak Chinese with them．I like the food in China，too．Dumplings（饺子）are my favorite food．I like noodles and pork，too．I also take many photos．Do you want to have a look？
Henry

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