作文题目:《制取氢气的操作过程》首先我向学生讲明,在化学课中大家学过制取氢气的知识,进行过制取氢气的实际操作,我们这节作文课则是练习如何准确地使用语言对制取氢气的实验过程进行文字说明。接着,我将化学课上使用过的制取氢气的一套简易装置作为直观教具搬上讲台。我要求学生先辨认仪器的各个部件,并仔细观察,了解这套仪器的装置,注意各个部件的位置和它们之间的相互关系。在学生观察以后,我请他们用科学术语一一说出各部件的名称,注意用词的准确性。学生分别答出:铁架台、试管、双孔橡皮塞……。我要求学生使用科学术语,是为了启发学生根据事物的特征,用恰当的名词准确地表达概念。比如,一根普通的玻璃管,在这套装置中起的作用是导气,就只能叫“导管”或“导气管”。如果这里称之为玻璃管,就不能说明其作用,用词就不准确。这说明要能够 Essay topic: “Preparation of hydrogen operation process” First of all, I explained to the students in the chemistry class, we learned the system of knowledge of hydrogen preparation for the actual operation of hydrogen production, our essay lesson is how to practice accurate The use of language for hydrogen production process for the experimental description of the text. Next, I put a simple set of devices for making hydrogen used in chemistry classes onto the podium as visual aids. I asked the students to first identify the various components of the instrument, and carefully observe and understand the apparatus of the instrument, pay attention to the location of the various components and their interrelationships. After the students observed, I asked them to use scientific terms one by one to say the name of each component, pay attention to the accuracy of the words. Students were answered: iron stand, test tube, double hole rubber plug ... .... I ask students to use scientific terminology in order to inspire students to express concepts correctly using proper nouns based on the characteristics of the things. For example, an ordinary glass tube, in this device plays the role of gas, it can only be called “catheter” or “airway.” If you call it a glass tube here, you can not explain its role, the wording is not accurate. This shows that we can