Amount of substance
n = m / M_r Edexcel International A Level XCH11/YCH11
⚗️ Edexcel International A Level Chemistry Formula Sheet 2026
Thermodynamics, kinetics, equilibria, organic calculations and analytical chemistry formulas curated for Edexcel XCH11/YCH11 papers.
Physical Chemistry Organic Chemistry Analytical Techniques
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.
Keep Your Chemistry Calculations Consistent
From enthalpy changes to electrode potentials and titration steps, this sheet keeps the essential relationships at your fingertips. Combine them with careful units and stoichiometry to present precise, examiner-friendly answers.
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Thermodynamics and energetics equations
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Electrochemistry potentials and cell emf
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Titration & volumetric analysis reminders
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Organic yield and empirical calculations
Amount of substance & energetics
Moles, gas law, and enthalpy cycles.
Ideal gas
p Pa, V m³, n mol, R = 8.31 J/(mol·K), T K.
p V = n R T Hess’s law
ΔH_route = Σ ΔH_steps Standard enthalpy of formation cycle
Elements in standard states.
ΔH_f from cycle sums (Born–Haber etc.) Bond enthalpy estimate
ΔH ≈ Σ D(bonds broken) − Σ D(bonds formed) Calorimetry
q = m c ΔT Topic Focus
Signs & states
- Always include state symbols in thermodynamic equations where required.
- Lattice enthalpy definitions must match ionic gas species.
Kinetics
Rates, orders, and Arrhenius.
Rate
rate = − d[A]/dt (etc.) Rate constant & order
Example first order in A.
rate = k [A]^m [B]^n Half-life (first order)
t½ = ln 2 / k Arrhenius
A pre-exponential, E_a activation energy.
k = A e^(−E_a / (R T)) Topic Focus
Experiments
- Initial rates method avoids product interference.
- Plot ln k vs 1/T for E_a from gradient.
Equilibria
Kc, Kp, and acid–base.
Kc
K_c = [products]^stoich / [reactants]^stoich (balanced equation) Kp (partial pressures)
Gases only; powers from stoichiometry.
K_p = Π (p_products)^ν / Π (p_reactants)^ν K_w
Water autoionisation.
K_w = [H⁺][OH⁻] = 10^(−14) at 25 °C pH
pH = −log₁₀[H⁺] Henderson–Hasselbalch (buffer)
pH = pK_a + log₁₀([A⁻]/[HA]) Nernst (electrochemical)
298 K form.
E = E° − (R T / n F) ln Q Topic Focus
Units
- Kp may require pressure units consistent with data (Pa or atm as defined).
- Partial pressure: mole fraction × total pressure.
Electrochemistry
Cells and electrolysis.
Charge
Q = I t Faraday
Q = n F (n moles of electrons) Standard cell potential
Reduction potentials.
E°_cell = E°_cathode − E°_anode ΔG & E
ΔG = − n F E Topic Focus
Electrolysis
- Discharge order depends on electrode potentials and concentration.
- Use n correctly when scaling mass deposited: m = Q M / (n F).
Organic & analysis (tools)
Yields, spectroscopy scale, and basic ratios.
Percentage yield
% yield = (actual / theoretical) × 100% Atom economy
AE = (M_r desired / Σ M_r reactants) × 100% Retention time (chromatography)
Qualitative comparison.
Higher affinity for stationary phase → longer t_R typically.
Topic Focus
Mechanisms
- Curly arrows show electron pair movement; identify nucleophile/electrophile roles.
- Stereochemistry: E/Z, R/S where chiral centres change.
How to Use This Formula Sheet
Boost your Cambridge exam confidence with these proven study strategies from our tutoring experts.
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Show Complete Stoichiometry
Write balanced equations before calculating moles or enthalpy changes so you can check limiting reagents quickly.
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Quote Data Sources
When using tabulated data (E°, bond energies, lattice enthalpy), cite the data booklet to support your approach.
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Track Units Carefully
Convert cm³ to dm³, kJ to J and °C to K before substituting into thermodynamic or gas equations.
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Link Calculations to Trends
After each numeric answer, comment on what it implies about equilibrium position, spontaneity or mechanism to earn explanation marks.
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 Edexcel International A Level 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. Concise Edexcel International A Level Chemistry (XCH11/YCH11) formula sheet for 2026 exams, covering thermodynamics, kinetics, equilibria, electrochemistry and analytical calculations. 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 (Upper Secondary)?
It is written for students preparing for assessments at Upper Secondary 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 the Edexcel International AS & A Level Chemistry (XCH11/YCH11) syllabus and data booklet tables.
Standard constants: F = 9.65×10⁴ C mol⁻¹, R = 8.31 J mol⁻¹ K⁻¹, Avogadro’s number = 6.02×10²³ mol⁻¹.