🧪 IGCSE Chemistry Formula Sheet 2025
Complete Cambridge IGCSE Chemistry (0620) Formula Reference Guide
Essential IGCSE Chemistry Formulas & Concepts
Master your IGCSE Chemistry exams with our comprehensive formula sheet covering all essential formulas, concepts, and calculations for Cambridge IGCSE Chemistry (0620). This reference guide includes atomic structure, stoichiometry, energetics, rates of reaction, equilibrium, redox reactions, electrolysis, acids & bases, organic chemistry, and more.
CIE IGCSE Chemistry (0620) – Extended Syllabus Formula Sheet
Complete Reference Guide for 2025 Syllabus
1. Atomic Structure & Stoichiometry
Ar = (average mass of 1 atom) / (1/12 mass of C-12 atom) Mr = Σ Ar n = mass / Mr mass = n × Mr N = n × Nₐ n = V / 24 C = n / V (mass of element / mass of compound) × 100 Simplest whole-number ratio of atoms 2. Chemical Calculations
Sum of relative atomic masses (Ar) n = mass / Mr mass = n × Mr no. of particles = n × 6.02 × 10²³ n = volume of gas / 24 concentration = moles / volume (mass of element in compound / total mass of compound) × 100 Simplest whole number ratio of atoms 2. Energetics
Q = mcΔT ΔH = Q/n Energy released (ΔH negative) Energy absorbed (ΔH positive) 3. Rates of Reaction
Rate = (change in concentration or mass) / time Concentration, surface area, temperature, catalyst Rate ∝ number of effective collisions 4. Equilibrium & Le Chatelier
Rate forward = Rate backward System opposes change in concentration, pressure, temperature 5. Gases & Gas Laws
PV = nRT n = V / 24 6. Acids, Bases & Salts
pH = -log[H⁺] Acid + Base → Salt + Water n = C × V 7. Electrolysis
Q = I × t n = Q / (F × z) 8. Redox & Reactivity
K > Na > Ca > Mg > Al > Zn > Fe > Pb > H > Cu Metal oxide + C → Metal + CO 9. Organic Chemistry
CₙH₂ₙ₊₂ CₙH₂ₙ CₙH₂ₙ₊₁OH Hydrocarbon + O₂ → CO₂ + H₂O Long-chain → shorter-chain + alkene 10. Units & Constants
Nₐ = 6.02 × 10²³ mol⁻¹ 24 dm³/mol c = 4.2 J/g°C F = 96500 C/mol 1 dm³ = 1000 cm³ 📚 How to Use This Chemistry Formula Sheet
Understand the Concepts
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Practice Calculations
Work through plenty of practice problems using these formulas. Chemistry calculations require both understanding and practice.
Connect Theory to Practice
Link these formulas to laboratory experiments and real-world chemical processes to deepen your understanding.
Show Your Working
Always show your calculations step by step in exams. This helps you avoid mistakes and earns partial credit.
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