题目内容
走进化学实验室,同学们学会了最基本的操作,以下操作正确的是
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A B C D
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A B C D
C
本题考查的是实验操作注意事项的探究。
A、过滤实验要用玻璃棒引流,故A错误;
B、给试管内的液体加热,试管内液体不可超过试管容积的三分之一,用外焰加热,用手握持试管夹的长柄,故B错误;
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、要用火柴点燃酒精灯,不能用一盏燃着的酒精灯去引燃另一盏酒精灯,否则,可能引发火灾,所以D错误。故选C
A、过滤实验要用玻璃棒引流,故A错误;
B、给试管内的液体加热,试管内液体不可超过试管容积的三分之一,用外焰加热,用手握持试管夹的长柄,故B错误;
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、要用火柴点燃酒精灯,不能用一盏燃着的酒精灯去引燃另一盏酒精灯,否则,可能引发火灾,所以D错误。故选C
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