Edexcel IAL Chemistry Topic 1 Checklist
(2025–2026 Exams)
Topic 1: Formulae, Equations and Amount of Substance
Key Terms and Concepts
Know the terms ‘ atom
’, ‘ element
’, ‘ ion
’, ‘ molecule
’, ‘ compound
’, ‘ empirical formula
’ and ‘ molecular formula
’
Know the mole (mol)
unit and perform calculations using Avogadro constant
Chemical Equations
Write balanced full and ionic equations
, including state symbols
Understanding Relative Masses
Define ‘ relative atomic mass
’ based on the 12C scale
Define ‘ relative molecular mass
’ and ‘ relative formula mass
’
Define ‘ molar mass
’ in g mol⁻¹
Understand parts per million (ppm)
Solution Calculations
Calculate concentration
in mol dm⁻³ and g dm⁻³
Empirical and Molecular Formulae
Use experimental data to calculate empirical formula
and molecular formula
Reacting Masses and Volumes
Calculate reacting masses
using amount of substance and molar mass
Calculate gas volumes
using molar volume
Use pV = nRT
for gases and volatile liquids
Percentage Yields and Atom Economy
Calculate percentage yields
and atom economies
Experimental Determination
Determine a formula or confirm an equation experimentally
Core Practical
CORE PRACTICAL 1
– Measurement of molar volume of a gas
Relating Equations to Observations
Relate equations to observations in displacement
, acid
, and precipitation reactions
Further Suggested Practicals
Prepare a salt
and calculate % yield
Determine a formula
by experiment (e.g. copper(II) oxide
by reduction)
Determine an equation
by experiment (e.g. lithium + water
)
Interpret results from simple test-tube reactions
