Amount of substance
n = m / M_r AQA A-Level 2026
🧪 AQA A-Level Chemistry Formula Sheet
Essential formulas for physical chemistry, inorganic chemistry, and organic chemistry aligned to AQA A-Level Chemistry (7404/7405) specification.
Physical Chemistry Inorganic Organic
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 A-Level Chemistry
This formula sheet covers fundamental chemistry relationships from the AQA A-Level Chemistry specification, helping you solve complex problems involving thermodynamics, kinetics, and equilibria.
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Thermodynamics
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Kinetics formulas
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Equilibrium constants
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Electrochemistry
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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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 AQA 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. Essential AQA A-Level Chemistry formulas covering physical chemistry, inorganic chemistry, and organic chemistry for UK A-Level students (7404/7405). 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 AQA A-Level Chemistry specification (7404/7405) for UK students.
Always show your working, include units, and check that chemical equations are balanced.