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“变化观”是中学化学学习中的核心观念,具体可分为化学变化是守恒的,化学变化是有规律的,化学变化是可利用的三个认识维度。“变化观”的建构要与现行教材中具体的化学知识体系相结合,化学知识积累与变化观深化是相互交替、螺旋式递进的关系。教师可以从生活实例、化学实验、化学理论等方面帮助学生建构“变化观”。
“Change view ” is the core concept of chemistry study in middle school, which can be divided into three dimensions: chemical change is conservative, chemical change is regular and chemical change is available. The construction of the concept of “change” should be combined with the specific chemical knowledge system in current textbooks. The accumulation of chemical knowledge and the deepening of change are alternations and spiraling relations. Teachers can help students to construct “change view ” from living examples, chemical experiments and chemical theory.