Class 9 science chapter 2 Is Matter Around Us Pure 2025

Class 9 science chapter 2 Is Matter Around Us Pure 2025 What does a mixture contain? A mixture contains more than one substance (element and/or compound) mixed in any proportion. How can mixtures be separated into pure substances? Mixtures can be separated into pure substances using appropriate separation techniques. What is a solution? A solution is a homogeneous mixture of two or more substances. What is the major component of a solution called? The major component of a solution is called the solvent. What is the minor component of a solution called? The minor component of a solution is called the solute. What is the concentration of a solution? The concentration of a solution is the amount of solute present per unit volume or per unit mass of the solution. What is a suspension? A suspension is a heterogeneous mixture of insoluble materials with visible particles. What is a colloid? A colloid is a heterogeneous mixture with particle sizes too small to be seen with the naked eye but big enough to scatter light. What are the dispersed phase and dispersion medium in a colloid? The particles in a colloid are called the dispersed phase, and the medium in which they are distributed is called the dispersion medium. What are pure substances? Pure substances can be elements or compounds. What is an element? An element is a form of matter that cannot be broken down by chemical reactions into simpler substances. What is a compound? A compound is a substance composed of two or more different types of elements, chemically combined in a fixed proportion. How do the properties of a compound compare to its constituent elements? Properties of a compound are different from its constituent elements. How do the properties of a mixture compare to its constituents? A mixture shows the properties of its constituting elements or compounds.