The questions in this quiz are suitable for GCSE combined science students studying reversible reactions and the dynamic equilibrium. If you struggled with the quiz, don't panic - we've got you!

Many chemical reactions are irreversible ... you cannot change a cake back into its ingredients again. Freezing is a reversible change. For example you can freeze juice to make ice lollies.

A research team led by Dr. Hyung-Suk Oh and Dr. Woong Hee Lee at the Clean Energy Research Center at Korea Institute of ...