论文部分内容阅读
在初中中考科学一科中,金属与酸反应是一个考试重点。中考说明要求学生达到理解水平,中考时常以选择、填空、探究、计算等不同题型形式出现。对学生而言,又是一个难点,因为已知条件稍一改变(如先放酸还是先放金属,是酸过量还是金属过量),相似题目往往出现不同答案。学生遇到此类题目,失分较为严重。笔者通过仔细分析,现归纳如下,
In junior high school science in a subject, metal and acid reaction is an exam focus. In the senior high school entrance examination requires students to reach the level of understanding, senior high school entrance examination often to choose, fill in the blanks, explore, calculate and other different types of questions appear. For students, it is also a difficult task, because known conditions change slightly (such as acid or metal, acid or metal excess), similar questions often appear different answers. Students encounter such problems, more serious loss points. The author through careful analysis, are summarized as follows,