IGCSE Chemistry
2026 - 2028
Syllabus Checklist ✅
Topic 6: Stoichiometry
Formulae
State the formulae
of the elements
and compounds
named in the subject content
Define the molecular formula
of a compound as the number and type of different atoms in one molecule
Deduce the formula
of a simple compound from the relative numbers of atoms present in a model or a diagrammatic representation
Construct word equations
and symbol equations
to show how reactants
form products
, including state symbols
Define the empirical formula
of a compound as the simplest whole number ratio of the different atoms or ions in a compound
Deduce the formula
of an ionic compound
from the relative numbers of the ions present in a model or a diagrammatic representation or from the charges
on the ions
Construct symbol equations
with state symbols
, including ionic equations
Deduce the symbol equation
with state symbols
for a chemical reaction
, given relevant information
Relative Masses of Atoms and Molecules
Describe relative atomic mass (A r
)
as the average mass of the isotopes of an element compared to 1/12th of the mass of an atom of C-12
Define relative molecular mass (M r
)
as the sum of the relative atomic masses. For ionic compounds
, relative formula mass (M r
)
will be used
Calculate reacting masses
in simple proportions (calculations will not involve the mole concept
)
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