3 May 2020
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.
1 May 2020
Percentage mass & empirical formula
Calculate how each element in a compound is pulling its weight, and use this to find the chemical formula empirically
24 Apr 2020
Solution concentration & titration
Sorry, we don't have 25% sugar here. How about 100 g/dm3 or 0.292 mol/dm3?
23 Apr 2020
Stoichiometry: Mole ratio & limiting reactant
Look into the future and predict the amount of product formed, by identifying the mole ratio and limiting reactant