Moles from mass
n (mol), m mass (g), M_r molar mass (g/mol).
n = m / M_r Pearson Edexcel GCSE 2026
🧪 Pearson Edexcel GCSE Chemistry Formula Sheet
Essential formulas for atomic structure, quantitative chemistry, chemical changes, and energy changes aligned to Pearson Edexcel GCSE Chemistry (1CH0) specification.
Quantitative Chemistry Chemical Changes Energy Changes
Our formula sheets are free to download — save this one as PDF for offline revision.
Aligned with the latest 2026 syllabus and board specifications. This sheet is prepared to match your exam board’s official specifications for the 2026 exam series.
Master GCSE Chemistry
This formula sheet covers fundamental chemistry relationships from the Pearson Edexcel GCSE Chemistry specification, helping you solve problems involving moles, concentrations, and chemical reactions.
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Mole calculations
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Chemical equations
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Concentration formulas
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Energy changes
Amount of substance & solutions
Moles, mass, concentration, and gas volumes.
Concentration
c (mol/dm³), n (mol), V volume of solution (dm³).
c = n / V Mass from moles
Rearrangement.
m = n × M_r Moles from solution volume
Combine c and V.
n = c × V Ideal gas volume (molar)
At RTP ~24 dm³/mol; at STP context may differ — check question.
V = n × 24 (dm³) at RTP (typical GCSE) Titration
Acid–base mole ratio from equation.
c_a V_a / n_a = c_b V_b / n_b (balanced stoichiometry) Dilution
Before adding water to a solution.
c₁ V₁ = c₂ V₂ Topic Focus
Stoichiometry
- Always balance the equation before using mole ratios.
- Convert cm³ to dm³ by dividing by 1000.
- Percentage yield = (actual mass ÷ theoretical mass) × 100%.
Yield, atom economy & purity
Efficiency and sustainability measures.
Percentage yield
From actual and theoretical quantities.
% yield = (actual yield / theoretical yield) × 100% Atom economy
M_r of desired product vs sum of M_r of all reactants.
Atom economy = (M_r desired / Σ M_r reactants) × 100% Percentage by mass
Element in a compound.
% element = (total mass of element in formula / M_r compound) × 100% Topic Focus
Green chemistry
- High atom economy means less waste in the desired product route.
- Yield measures practical efficiency; atom economy measures how much of the atoms end up in the product.
Energy changes
Enthalpy and simple energy accounting.
Enthalpy change (definition)
ΔH = H_products − H_reactants (at constant pressure).
ΔH = Σ H(products) − Σ H(reactants) Energy transferred
q (J), m (kg or g with consistent c), c specific heat, ΔT.
q = m c ΔT Bond energy estimate
ΔH ≈ Σ bonds broken − Σ bonds made (approximation).
ΔH ≈ Σ D(broken) − Σ D(formed) Molar enthalpy from q
n moles of limiting reactant.
ΔH = − q / n (exothermic: sign convention by question) Topic Focus
Signs
- Exothermic: energy released to surroundings (often negative ΔH by convention).
- State symbols and physical states matter in energy cycles.
Rates & equilibrium
How fast reactions go and how far they proceed.
Rate of reaction
Change in amount or concentration per time.
rate = Δ(amount) / Δt Rate from gradient
Concentration–time graph.
rate = gradient of tangent (instantaneous) Equilibrium constant (K_c)
For aA + bB ⇌ cC + dD (concentrations at equilibrium).
K_c = [C]^c [D]^d / ([A]^a [B]^b) pH
H⁺ concentration in mol/dm³.
pH = −log₁₀[H⁺] Topic Focus
Catalysts & collisions
- Rate depends on collision frequency and energy; catalysts provide alternative lower-energy pathways.
- At equilibrium, forward and reverse rates are equal — concentrations stay constant.
Electrochemistry & electrolysis
Charge, moles of electrons, and mass deposited.
Charge
Q (C), I (A), t (s).
Q = I t Moles of electrons
F Faraday constant ≈ 96480 C/mol.
n(e⁻) = Q / F Mass from electrolysis
M ion mass per mole, z charge on ion.
m = (Q × M) / (z × F) Topic Focus
Electrolysis
- Identify which ions are reduced or oxidised at each electrode.
- Use the correct ion charge z when scaling moles of electrons to moles of metal.
How to Use This Formula Sheet
Boost your Cambridge exam confidence with these proven study strategies from our tutoring experts.
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Balance Equations First
Always balance chemical equations before doing stoichiometric calculations. Check atom counts on both sides.
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Check Units
Ensure units are consistent: convert mL to dm³, grams to moles, etc. before calculating.
Formula sheet FAQ
Quick answers about this free PDF, how to use it for exam revision, and how it relates to your official syllabus.
Is the Pearson Edexcel GCSE Chemistry Formula Sheet 2026 free to download as a PDF?
Yes. This Tutopiya formula sheet is free to use and you can download it as a PDF from this page for offline revision. There is no payment or account required for the PDF download.
What Chemistry topics and equations does this formula sheet cover?
This page groups key Chemistry formulas in one place for revision. Comprehensive Pearson Edexcel GCSE Chemistry formulas: moles, solutions, yields, energetics, rates, equilibrium, and electrochemistry — for UK GCSE (1CH0). Always cross-check with your official syllabus and past papers for your exam session.
Can I use this instead of the official exam formula booklet in the exam?
No. In the exam you must follow only what your exam board allows in the hall—usually the official formula booklet or data sheet where provided. This page is a revision and teaching aid, not a replacement for board-issued materials.
Who is this formula sheet for (Secondary Education)?
It is written for students preparing for assessments at Secondary Education in Chemistry, including classroom revision, homework support, and independent study. Teachers and tutors can also share it as a quick reference.
How should I revise with this formula sheet?
Work through past paper questions, quote the correct formula before substituting values, and check units and notation every time. Pair this sheet with timed practice and mark schemes so you see how examiners expect working to be set out.
Where can I get more help with Chemistry revision?
Explore Tutopiya’s study tools, past paper finder, and revision checklists linked from our tools hub, or book a trial lesson with a subject specialist for personalised support alongside this formula reference.
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Formulas align with Pearson Edexcel GCSE Chemistry specification (1CH0) for UK students.
Always show your working, include units, and check that chemical equations are balanced.