Ah Cher

How do you identify the unknown ions present in a mystery solution?

The definitive guide to qualitative analysis

Take charge of your learning by doing the quiz on ionic charge

Learn about the defining property of acids: acids dissociate in water to produce hydrogen ions, either partially or fully, depending on…

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

Calculate how each element in a compound is pulling its weight, and use this to find the chemical formula empirically

Unit-less but meaningful: making sense of the mass of an atom with ratio

Sorry, we don't have 25% sugar here. How about 100 g/dm3 or 0.292 mol/dm3?

Look into the future and predict the amount of product formed, by identifying the mole ratio and limiting reactant

Gases of different masses taking up the same spaces

Learn how how to count, but in moles

Fresh from the furnace of O Level

The art of chemistry: drawing dot-and-cross diagrams and more

Diamond and graphite, same same but different

Breathe in, and learn about the structure and physical properties of simple molecules found in your breath

Be crystal clear about the physical properties of ionic compounds, as you look at minerals that make up the Earth

The story of give and take, in terms of electrons

Dot the i's and cross the t's of your dot-and-cross diagrams

Share share our electron pair

Writing chemical equation is a fine balancing act, literally