What is a molecule?

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

Are ionic compounds soluble in water?

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

Gas collection: water displacement, upward delivery & downward delivery

The three methods of collecting gases by their physical properties

How to find the cation and anion in a compound?

What are ionic compounds and the ions they contain?

Differences between crystallisation and evaporation to dryness

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

Lee Jia Jun on the long journey of drug discovery

We speak to pharmacologist Lee Jia Jun about his scientific work on drugs and the reality of drug discovery.

Bernie Lee on using computers to study the chemistry of life

We speak to chemist Bernie Lee about how she conducts experiments on the computer, to study the bonding between protein and other…

Transition elements: What makes Tanah Merah so merah?

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

New year, new me, new chemistry

Chemistry in upper secondary offers a fresh start to your chemistry with science.

Noble gases: The high and mighty helium

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?

Mixtures & pure substances: The mystery of air

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

Paper chromatography TYS questions – N Level Chemistry

Dye dye must try these typical TYS questions on separating dyes with paper chromatography!

Paper chromatography

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

Simple distillation vs fractional distillation

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

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.

Ion formation: The colour of lightning strike

Plasma is the fourth state of matter. It sounds exotic, but it is around us, especially during a thunderstorm.

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?