Notes

A molecule is a particularly small group of non-metal atoms that are held together by covalent bond

Chemistry is messy: most but not all ionic compounds are soluble in water

The three methods of collecting gases by their physical properties

What are ionic compounds and the ions they contain?

Crystallisation and evaporation to dryness are two different methods to separate different solutes from their solution.

Find out the transition element that dyes the soil in Tanah Merah brick red and gave the place its name.

Helium was discovered on the sun before it was found on earth. What about it as a noble gas makes it so good at hiding?

For most part of human history, scientists could not correctly tell whether air is a single substance or a mixture.

Paper chromatography is a simple yet powerful detective tool to separate and analyse the substances in a mixture.

A solution of two miscible liquids is tricky to separate. How can we solve it with fractional distillation, a modified version of simple…

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

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

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

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

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

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

The kinetic particle theory explains the visible with the invisible.

We can all play a part to clear the air of greenhouse gases to slow global warming.

Have your eye on ion

Ironing out how we get iron out of haematite