Cher's pick

What are isotopes?

Atoms of the same element may not be identical. The different forms of an element are called isotopes.

Distillation: an ancient technique to separate liquid

Distillation has been used to separate and purify liquid since more than 2000 years ago.

Proton: getting particular about identifying elements

The proton is the subatomic particle that defines the chemical identity of an element.

Electron: what we know and can never know

The electron is the first subatomic particle to be discovered, turning chemistry on its head more than a century ago.

Virtual lab: identifying an unknown gas

What gas forms when we add acid to the carbonate ions in a seashell?

Carbon dioxide & other acidic oxides

Some oxides can behave like an acid and neutralise bases. How do you identify them?

What is atomic structure?

The atom is not a featureless ball. It consists subatomic particles arranged in an mind-boggling way.

Type of chemical bond quiz

Are you born to guess the type of bond?

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Surely, our notes will help you overcome the O Level Chemistry exams. But life is more than that, and Chemistry too. We will show you the exciting aspect of Chemistry through our stories on everyday applications, folk knowledge, history of science, philosophy, and the latest scientific breakthrough.