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Led by Jöns Jacob Berzelius
Module 4 of Edexcel GCSE Chemistry — closing the four-module Topic 1 sequence. Led by Jöns Jacob Berzelius, who gave chemistry its symbol notation and determined the relative atomic weights of almost every element of his time. The student masters relative formula mass, percentage composition, empirical formulae, conservation of mass, and (at Higher tier) the mole, Avogadro's constant, and reaction stoichiometry.
Led by Jöns Jacob Berzelius
The question
How does a chemist quantify what is happening in a reaction — calculate the relative mass of a compound, the percentage of an element in it, the empirical and molecular formulae, the masses of reactants and products predicted by a balanced equation, and (at Higher tier) the number of moles, particles, and the underlying stoichiometry? The spec asks the student to use the relative atomic masses given on the periodic table and the principles of conservation of mass and reacting proportions to perform every quantitative chemical calculation expected of a GCSE chemist.
Outcome
the student can calculate relative formula mass and percentage composition, determine empirical and molecular formulae, apply conservation of mass to open and closed systems, calculate masses from balanced equations, work with concentrations in g dm⁻³, and (Higher tier) define the mole, convert between mass / moles / particles, identify limiting reactants, and deduce stoichiometry from experimental masses. *(Edexcel 1CH0 — Topic 1, spec points 1.43–1.53)*
Sub-units