问题 选择题

正确的化学实验操作对实验结果,人身安全非常重要.下图所示各项实验操作中正确的是(  )

A.

B.

C.

D.

答案

A、闻气体的气味时,防止气体有毒,应用手扇动,不能直接用鼻子闻.操作错误,故A不符合题意;

B、加热的坩埚太热,不能直接用手拿取,会烫伤手,应用坩埚钳夹取,故B不符合题意;

C、取用液体时:①试剂瓶瓶口要紧挨试管口,防止液体流出;②标签向着手心,防止液体流出腐蚀标签;③瓶塞倒放桌面上,防止污染瓶塞,从而污染药品.故C正确;

D、稀释浓硫酸时,将水沿容器内壁缓缓注入浓硫酸中,会沸腾溅出,可能伤人.图中操作错误,故D不符合题意.

故选C.

论述题
判断题

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