下列实验现象的描述正确的是( ) A.铁丝在空气中燃烧火星四射 B

下列实验现象的描述正确的是(  )

A.铁丝在空气中燃烧火星四射

B.白磷在空气中燃烧生成白色烟雾

C.碳在氧气中燃烧生成黑色固体

D.硫在氧气中燃烧发出明亮的蓝紫色火焰

答案

【考点】氧气与碳、磷、硫、铁等物质的反应现象.

【分析】A、根据铁丝在空气中燃烧的现象进行分析判断.

B、根据白磷在空气中燃烧的现象进行分析判断.

C、根据碳在氧气中燃烧的现象进行分析判断.

D、根据硫在氧气中燃烧的现象进行分析判断.

【解答】解:A、铁丝在空气中只能烧至发红,不会产生火星,故选项说法错误.

B、白磷在空气中燃烧,产生大量的白烟,而不是白色烟雾,故选项说法错误.

C、碳在氧气中燃烧,发出白光,生成能使澄清石灰水变浑浊的气体,故选项说法错误.

D、硫在氧气中燃烧,发出明亮的蓝紫色火焰,故选项说法正确.

故选:D.

【点评】本题难度不大,掌握常见物质燃烧的现象即可正确解答,在描述物质燃烧的现象时,需要注意光和火焰、烟和雾的区别.

 

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