Limiting Reactants GCSE Chemistry | Less Mass Isn't Limiting

Limiting reactants for GCSE Chemistry: why the reactant you have least of isn't automatically the one that runs out. This video shows how to find the limiting reactant using moles and the ratio, and how to spot the excess reactant too. Higher Tier content. You'll see why 11.2 g of iron and 8 g of sulfur fools a lot of students, a recipe analogy for non-1:1 ratios, an exam-style worked example (20 g of calcium with 9.6 g of oxygen) and a checkpoint question (7.2 g of magnesium with 6.4 g of oxygen) so you can try it yourself first. 0:00 Which one runs out first? 0:15 Why this costs marks 0:37 Limiting vs excess reactant 1:22 Why grams don't count particles 2:02 The recipe analogy 2:19 The same recipe in chemistry 2:37 The test: needs vs has 2:54 Worked example: calcium and oxygen 4:11 Why "less mass runs out" fails 4:56 Checkpoint: magnesium and oxygen 5:50 3 things to take away 6:16 Final thought Covers AQA, Edexcel and OCR GCSE Chemistry. Enhance Minds offers 1-to-1 GCSE and A-level tuition: enhanceminds.co.uk