O Level Pure Questions

What is the relationship between redox and photosynthesis, and is it as simple as counting the oxidation numbers? Tease your brain with…

What exactly does reactivity mean? Muse on it with this curated list of O Level TYS questions.

Isotopes are chemically similar but not identical. Their subtle difference makes them an excellent tool to find out if dinosaurs were warm…

Not all fragrant chemicals are pleasant

The chemistry behind how old things are made new

What can be more practical than revising for practical exam with past-year practical papers?

Unmask the truth about "negative oxygen ion face mask"

Read about the Singapore water story, as told through the lens of a chemist, and learn the separation techniques and chemicals involved in…

It's big brain time, as you think backwards from the salt in question to infer the reagents and method

Use our Electrolysis Guidebook to conquer these electrifying O Level questions

Are O Level questions exothermic? Feel the heat as you attempt challenging exam questions.

Don't let the difficult question from the 2014 paper be your endpoint. Overcome it here!

Learn how combustion and ionisation power rockets

Fresh from the furnace of O Level

Practise data-based questions as you travel back in time to find out how chemists overcame safety and design problems to deliver fresh air…

Try out challenging questions from prelim papers to apply what you have learned about acids: dissociation of hydrogen ions, acid formation,…

Learn stoichiometry and the mole concept by solving problems taken from O Level prelim papers. Answers and explanations are included.

Fresh from the furnace of O Level