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Brainlag Learn / GCSE Chemistry

Quantitative chemistry and the mole

Conservation of mass, relative formula mass, percentages and concentrations, the mole, reacting masses, empirical formulae, yield, atom economy, titrations and gas volumes.

Lessons

  1. Conservation of mass and relative formula massWhy the total mass never changes in a reaction, why a balance reading can still go up or down, and how to add up a relative formula mass. 20 min, with the Molar Mass Calculator, free
  2. Percentage by mass and concentration in g/dm³What share of a compound's mass is one element, how much metal an ore can give, and how much solid is dissolved in each cubic decimetre of a solution. 20 min, with the Molar Mass Calculator, free
  3. Moles, the Avogadro constant and reacting massesCounting particles by weighing them: moles from mass, the Avogadro constant, masses that react from a balanced equation, and the limiting reactant. 25 min, with the Periodic Table, Plus, Higher tier
  4. Balancing equations and empirical formulae from massesTurning measured masses into moles to find the numbers in a balanced equation, the simplest formula of a compound, and its molecular formula. 20 min, Plus, Higher tier
  5. Percentage yield and atom economyHow much product you really get compared with the most you could, how many of the starting atoms end up in that product, and how industry weighs the two. 20 min, Plus, Chemistry only
  6. Concentration in mol/dm³, titrations and gas volumesMoles in a solution, working out an unknown concentration from a titration, and the volume one mole of any gas takes up at room temperature and pressure. 25 min, Plus, Chemistry only, Higher tier

Practise and test

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