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空气是同学们既熟悉而又陌生的物质,其相关知识点始终是中考和各种考试考察的重点和热点之一。掌握本单元的易错点和易混淆点,有助于提高同学们的知识迁移能力。一、易错点1.描述实验现象:三忌:①忌把生成物名称当作现象来描述(如硫在空气中燃烧的现象是生成二氧化硫就显然不是对现象的描述);②忌脱离实验实际(如铁在空气中剧烈燃烧、火星四射就脱离了实际,
The air is a familiar and unfamiliar material for classmates. Its related knowledge has always been one of the focuses and hotspots of the examinations and examinations. Grasping the error-prone and confusing points of this unit will help improve the students’ knowledge transfer ability. 1. Error-prone point 1. Describe the experimental phenomenon: three bogey: 1 bogey describe the name of the product as a phenomenon (such as sulfur burning in the air is to generate sulfur dioxide is obviously not a description of the phenomenon); 2 bogey from the experiment Actual (if iron is burning in the air and Mars is out of reality,