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在中学化学教学中,采用设问与解疑的教学方法,激起学生的求知欲望,有利于学生理解和掌握化学基础知识。教学时,教师可根据教材特点,提出一些由浅入深、富有启发性的问题,把学生注意力集中到探究这些问题上来。例如高一《摩尔》一节。教师从化学反应中原子、分子、离子等微粒的真实质量是不能用天平称量的;用真实质量与“个数”为单位就必然出现巨大、冗繁的数字,给计算带来麻烦与困难。教师通过揭示这些矛盾,启发学生去思维,寻求解决矛盾的办法。然后让学生回答下列问题:(1)12gC、16gO、1gH所含原子个数各是多少?(2)以N_A个微粒集体作为1个单位来度量“物质的量”是否可以解决上述二个矛盾呢?(3)什么是摩尔?通过(1)、(2)问题使学生认识到引入摩尔的
In chemistry teaching in secondary schools, teaching methods based on questions and solutions are used to arouse students' desire for knowledge. It is good for students to understand and master the basic knowledge of chemistry. Teaching, the teacher can be based on the characteristics of teaching materials, put forward some shallow, enlightening questions, the students focus to explore these issues. For example, a higher “Moore” section. Teachers from the chemical reaction of atoms, molecules, ions and other particles of the real quality can not be weighed by the balance; with the real quality and “number” as a unit will inevitably appear huge, cumbersome numbers, to bring trouble and difficulty. Teachers reveal these contradictions, inspire students to think, to find ways to resolve conflicts. Then ask students to answer the following questions: (1) What is the number of atoms in 12gC, 16gO and 1gH each? (2) Whether the “quantity of matter” is measured by taking N_A particle aggregates as one unit can solve the above two contradictions (3) What is Moore? By (1), (2) the problem to make students recognize the introduction of Moore