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O Level Chemistry Notes By Topics

Prepare for the O Level Chemistry subject

O Level Chemistry Notes - Atomic Structure

Refer to these notes to help you understand and apply:

  • The relative charges and approximate relative masses of a proton, neutron and electron.
  • Describe, with the aid of diagrams, the structure of an atom.
  • Proton (atomic) number and nucleon (mass) number
  • Interpret and use nuclide notations such as 12 6 C
  • Define the term isotopes
  • Deduce the numbers of protons, neutrons and electrons in atoms and ions given proton and nucleon numbers.


These O levels Chemistry notes are suitable for students in Sec 3/4 taking Pure or Combined Chemistry subjects.

Prepare for the O Level Chemistry subject

O Levels Chemistry Notes - Mole Concept

These notes will help you to understand and apply the following topics for your exams:

  • Relative atomic mass, Ar
  • Relative molecular mass, Mr, and calculate relative molecular mass.
  • Mole in terms of the Avogadro constant
  • Calculate percentage mass of an element in a compound.
  • Calculate empirical and molecular formulae.
  • Calculate stoichiometric reacting masses and volumes of gases
  • Concept of solution concentration to process the results of volumetric experiments and to solve simple problems.
  • Calculate % yield and % purity.


These O levels Chemistry notes are suitable for students in Sec 3/4 taking Pure or Combined Chemistry subjects.

Prepare for the O Level Chemistry subject

O Levels Chemistry Notes - Chemical Bonding

Practice for your examinations by using these notes to understand:

  • Ionic Bonding
  • Covalent Bonding
  • Metallic Bonding
  • Structures and Properties of Materials


These O levels Chemistry notes are suitable for students in Sec 3/4 taking Pure or Combined Chemistry subjects.

For more worked examples and exam resources, see our mock exam papers here.

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