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“物理性质和化学性质”是浙教版七年级上册科学第四章最后一节,这节内容是对前面学过的各种物质性质的初步概括,这节课教学重点、难点是物理性质和化学性质的定义。教科书对物理性质和化学性质的定义:物理性质是物质不需要化学变化就能表现出来的性质;化学性质是物质只能在化学变化中才能表现出来的性质。浙教版教参对物理性质与化学性质定义的教学建议:对物理性质和化学性质,教科书先让学生以铁为例,列举铁的多种性质,并要求学生根据这些性质是仅在物理变化中反映出来的,还是需要发牛化学变化才能反映
“Physical properties and chemical properties ” is the last chapter of the fourth chapter of the Zhejiang edition of grade seven science, this section is a preliminary summary of the nature of the various materials learned in front, the focus of this lesson teaching, the difficulty is the physical The definition of nature and chemistry. Textbooks define the physical and chemical properties: Physical properties are properties that matter can exhibit without requiring chemical changes. Chemical properties are properties that can only be manifested in a chemical change. Zhejiang Teaching Edition Teaching parameters for the definition of physical and chemical properties of the teaching suggestions: For physical and chemical properties, textbooks let students take iron as an example, enumerating a variety of properties of iron, and require students according to these properties is only physical changes Reflected in, or need to send cattle chemical changes can be reflected