摘要:17.请简要叙述下图所示的实验装置.方法.操作中存在的错误. (1) , (2) , (3) , (4) , (5) , (6) . 解析:(1)向试管中滴加液体时.试管要竖直.滴管要垂直悬空. (2)给试管中液体加热时.液体体积不能超过试管容积的.加热时.应用酒精灯的外焰加热. (3)蒸馏时.温度计水银球应在蒸馏烧瓶的支管口处. (4)过滤时玻璃棒下端放在三层滤纸处. (5)NO不能用排空气法收集.只能用排水法. (6)铁丝在氧气中燃烧时.应在瓶底铺层细沙或瓶中放少量水. 答案:(1)试管没竖直,滴管口接触管壁 (2)试管底部放在酒精灯焰芯上,试管内液体体积不能超过试管容积的1/3 (3)温度计的水银球插在乙醇溶液中 (4)玻璃棒没有接触滤纸三层的一边 (5)不能用排空气法收集NO (6)瓶底没有铺一层细沙或瓶里没有加少量水
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请简要叙述下图所示的实验装置、方法、操作中存在的错误.
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请简要叙述下图所示的实验装置、方法、操作中存在的错误。
(1)________________________________________________________________________;
(2)________________________________________________________________________;
(3)________________________________________________________________________;
(4)________________________________________________________________________;
(5)________________________________________________________________________;
(6)________________________________________________________________________。
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