Separation Methods and Chemical Building Blocks

Methods of Mixture Separation

  • Magnetism:

    • A physical separation technique applied when one of the substances present in a mixture exhibits magnetic properties.

    • Procedure: A magnet is brought close to the mixture to pull out and remove the magnetic component.

    • Example: Using a magnet to pull out and separate iron filings from sand.

  • Decanting:

    • A physical separation technique used to separate liquids with different densities.

    • Procedure: The top layer of a liquid mixture is poured off after the less dense substance separates and floats on top of the denser substance.

Elements, Compounds, and Molecules

  • Elements:

    • Defined as the simplest building blocks of matter.

    • Cannot be broken down into simpler substances by physical or chemical means.

    • Composed entirely of only one type of atom.

    • Examples: Oxygen, gold.

  • Compounds:

    • Composed of two or more elements combined together.

    • Form many of the common substances interacted with on a daily basis.

    • Examples:

    • Water (H2OH_2O)

    • Salt / Sodium Chloride (NaClNaCl)

  • Molecules:

    • Defined as groups of two or more atoms that are joined together chemically.

    • Classification types:

    • Elemental Molecules: Molecules formed from the same element (e.g., O2O_2).

    • Compound Molecules: Molecules formed from different elements (e.g., H2OH_2O).