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1.分析概念。教学时要仔细分析概念,弄清含义,抓住概念中的关键字词,找出概念的实质。如关于“催化剂”这一概念,要抓住其中的三个要素:一是其中的“改变”两字(既有加快又有减慢之意);二是催化剂本身的质量在化学反应前后没有改变;三是在化学反应前后催化剂的化学性质不改变。只要在教学中留意,抓住要点,就能正确理解概念,从而灵活应用。此外,在教学中,教师一定要注意对概念论述时用词的严密性和准确性。如纯净物、混合物、单质、化合物等这样的概念,
1. Analysis concept. Teaching carefully analyze the concept, understand the meaning, grasp the key words in the concept, find the essence of the concept. As for the concept of “catalyst ”, we should grasp three of the elements: one of them “change ” (both to speed up and slow down); the second is the quality of the catalyst itself No change before and after the chemical reaction; Third, chemical properties of the catalyst before and after the change does not change. As long as the attention in teaching, grasp the key points, we can correctly understand the concept, so flexible application. In addition, in teaching, teachers must pay attention to the rigor and accuracy of the wording of the concept discourse. Such as pure things, mixtures, simple substances, compounds and other such concepts,