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Molecule, Atom

Pure substance can be classified as elements or compounds.

Element: The basic form of matter that cannot be broken down into simpler substances by chemical reactions’.

Elements can be further classified as metals, non-metals, metalloids and noble gases.

Compound: Compounds are formed when two or more elements combine chemically in a fixed proportion.

  • Mixture 
  1. Mixtures refer to those substances whic…

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