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九年级化学作为起始学科,时间短、内容多,在中考前有效且高效地复习,将多个知识点整合,由点成线,寻找化学学科中的提分点,不仅能提高成绩,而且为学生将来的持续学习打下扎实的基础,下面是我的思考和总结.一、整理常见的中考考点,做到有的放矢1.判断物理变化和化学变化(一定要找到新物质)、物理性质和化学性质(一定发生化学变化表现出来的),如石油分馏、固体氢氧化钠的潮解是物理变化,煤的干馏或炼焦是化学变
The ninth grade chemistry as a starting discipline, time is short, more content, effective and efficient review before the senior high school entrance examination, the integration of multiple points of knowledge, from point to line, to find chemistry points in points, not only can improve performance, But also lay a solid foundation for the continued learning of students in the future, the following is my thinking and summary.First, finishing common entrance examination sites, to be targeted.1 judge the physical changes and chemical changes (we must find new substances), physical properties and Chemical properties (shown by certain chemical changes), such as petroleum fractionation, physical deliquescence of solid sodium hydroxide, chemical conversion of coal by distillation or coking