4 Classification of Matter

Classification of Matter

General Overview

  • Matter is classified according to its properties and functions.

  • Organizing matter aids in its study and utilization.

Types of Matter

  • Pure Substance

    • Composed of one kind of atom or molecule.

    • Cannot be separated by ordinary physical or chemical means.

    • Can be simplified only through nuclear fission.

  • Mixture

    • Consists of two or more pure substances that maintain their individual properties.

    • Components can be separated by physical means.

Categories of Pure Substances

  1. Elements

    • Simplest form of matter made of same kind of atoms.

    • Not decomposable through chemical processes.

    • Examples include Neon, Krypton, and Titanium.

  2. Compounds

    • Composed of two or more different elements chemically combined in a fixed ratio.

    • Properties differ from individual elements.

    • Examples: Sodium Bicarbonate (NaHCO3), Water (H2O).

Key Terms to Note

  • Atom: Smallest unit that retains the properties of an element.

  • Molecule: Combination of two or more non-metallic atoms bonded covalently.

  • Diatomic Molecules: Molecules made of two atoms of the same or different kinds.

Types of Mixtures:

  • Homogeneous

    • Evenly mixed; the composition is uniform.

    • Example: Coffee, Sugar Water.

    • Not visibly distinguishable.

  • Heterogeneous

    • Can see different parts/components.

    • Example: Fruit Salad, Sand.

Separation Techniques

  1. Filtration

    • Used for separating insoluble solids from liquids.

  2. Decantation

    • Separating liquid from settled particles.

  3. Evaporation

    • For extracting soluble solids from liquids.

  4. Distillation

    • Used for separating miscible liquids based on boiling points.

  5. Chromatography

    • Separation based on movement through a medium using solvent.

    • Retention Factor (Rf) calculation for components in mixtures.

Additional Information

  • Alloys: Mixtures of metallic elements, e.g., Bronze (88% copper, 12% tin).

  • Importance of using appropriate separation techniques in the recovery of components from mixtures.