《普通高中化学课程标准》要求学生具有较强的问题意识,能发现和提出有探究价值的化学问题,学会运用观察、实验、查阅资料等多种手段获得信息,并运用比较、分类、归纳、概括等方法对信息进行加工。在与中学化学教师的交流中,笔者发现不少学生缺乏问题意识,不会分析问题,解决问题想当然,很少思考。现从以下几个方面进行说明。一、导气管问题大家都认为加热固体制取气体时,导气管伸入试管过深不利于气体导出。其实更主要的原因是导管伸入过深不利于把试管内的空气排净,使收集到的气体不纯。二、灯火实验问题未开启的菜窖、干涸的深井和深洞进入之前要做灯火实 The “Standard Chemistry Curriculum for General Senior High School” requires students to have a strong awareness of problems, to discover and propose chemical problems of inquiry value, learn to use information obtained from observation, experiment, access to information and other means and to compare, classify, summarize, Summarize and other methods of information processing. In the communication with middle school chemistry teachers, I found that many students lack awareness of problems, do not analyze problems, take it for granted and rarely think about it. Now from the following aspects to explain. First, the airway problems We all think that heating the solid system for gas, the airway into the tube too deep is not conducive to the gas export. In fact, the more important reason is that the catheter is too deep to extend into the test tube emptying the air so that the gas collected is not pure. Second, the lighting experiment problem Not open the cellar, dried deep wells and deep holes to do before entering the lights to do solid