Notes of Is Matter Around Us Pure – Class 9

The document discusses different types of pure and impure substances: 1. Pure substances can be elements or compounds. Elements are made of only one type of atom while compounds are made of two or more elements chemically bonded together. 2. Impure substances or mixtures contain two or more substances mixed together physically. Mixtures can be homogeneous, with an even distribution...

The document discusses different types of pure and impure substances: 1. Pure substances can be elements or compounds. Elements are made of only one type of atom while compounds are made of two or more elements chemically bonded together. 2. Impure substances or mixtures contain two or more substances mixed together physically. Mixtures can be homogeneous, with an even distribution of substances, or heterogeneous with distinct layers. 3. Common types of mixtures and solutions discussed include suspensions, colloids, alloys and solutions. Key properties like stability, particle size and filtration are used to distinguish between different types of mixtures and impure substances.