Stoichiometry TYS questions – Combined Chemistry

There is no stoichiometry without try: try out questions from the O Level Combined Chemistry papers

Stoichiometry: Percentage yield & percentage purity

Be 100% sure about how to calculate percentage yield and percentage purity

Salt preparation TYS questions

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

Stoichiometry & the mole concept prelim questions

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

Percentage mass & empirical formula

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

Relative atomic mass & molecular mass

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

Solution concentration & titration

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

Stoichiometry: Mole ratio & limiting reactant

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

Molar volume of gases

Gases of different masses taking up the same spaces

The mole & molar mass

Learn how how to count, but in moles

Practise how to write chemical formula

Can you infer the formulae of ionic compounds, based on the charges of their constituent ions?