论文部分内容阅读
纯净物、混合物是初中化学中的一对重要概念.正确认识和理解这对概念的本质,是正确判断纯净物和混合物的基础,也是化学启蒙阶段学习的必经之路. 一、理解并掌握纯净物和混合物的概念1.纯净物:宏观上,由同种物质组成(一种成分);微观上,由同种粒子(一种分子)构成;具有固定的组成和一定的性质(如熔沸点等).例如氧气、碱式碳酸铜、氧化镁等.
Pure substances and mixtures are an important concept in junior high school chemistry. Correctly understanding and understanding the nature of this concept is the foundation for correct judgment of pure substances and mixtures, and it is also the only way to learn during the chemical enlightenment phase. I. Understand and master The concept of pure substances and mixtures 1. Pure substances: Macroscopically, composed of the same species (a component); microscopically, composed of the same species (a kind of molecule); having a fixed composition and certain properties (such as melting The boiling point, etc.) For example, oxygen, basic copper carbonate, magnesium oxide and so on.