一、教学背景分析离子浓度大小比较是高考的热点,在全国和地方高考试题中出现率几乎100%。但是学生在学习中难以掌握,在考试中经常出错。这是因为离子浓度大小比较题是一类难度大、综合性强的题型。本节课的学习目标是学生能根据特定程序正确分析、比较离子浓度的大小关系,这属于程序性知识中的程序(也称为算法)学习。程序学习最有效的策略是让学生完成该程序或是让学生纠错,不适合探究式教学, First, the analysis of teaching background Comparison of ion concentration is the hot college entrance examination in the national and local college entrance examination questions appeared in almost 100%. However, students are hard to master in their studies and often make mistakes in their examinations. This is because the size of the ion concentration is a more difficult problem, the comprehensive strong questions. The objective of this lesson is to enable students to correctly analyze and compare the ion concentration based on a specific program, which is a program (also known as algorithm) learning in procedural knowledge. The most effective strategy for program learning is for students to complete the program or for students to correct errors that are not suitable for inquiry teaching,