Complete Chemistry Formula Sheet for All Classes
Welcome to the most comprehensive chemistry formula sheet available online! This ultimate chemistry formula sheet contains all essential formulas for classes 10, 11, and 12, plus specialized sections for NEET preparation and competitive exams. Whether you’re looking for basic chemistry formulas, organic chemistry formulas, or physical chemistry formula sheet content, you’ll find everything organized in one convenient location.
Basic Chemistry Formula Sheet
Atomic Structure
Mass Number = Protons + Neutrons
Atomic Number = Number of Protons
Number of Electrons = Number of Protons (neutral atom)
Isotopes: Same Z, Different A
Mole Concept
n = m/M (moles = mass/molar mass)
N = n × N₀ (N₀ = 6.022 × 10²³)
V = n × 22.4 L (at STP)
% by mass = (mass of component/total mass) × 100
Chemical Bonding
Formal Charge = V – N – B/2
Bond Order = (Nb – Na)/2
Lattice Energy ∝ q₁q₂/r
Electronegativity Difference > 1.7 = Ionic
Acids and Bases
pH = -log[H⁺]
pOH = -log[OH⁻]
pH + pOH = 14 (at 25°C)
Kw = [H⁺][OH⁻] = 1×10⁻¹⁴
Stoichiometry
% Yield = (Actual/Theoretical) × 100
Atom Economy = (Mr of desired product/Mr of all products) × 100
Limiting Reagent: Smallest mole ratio
Mass Balance: Mass in = Mass out
Periodic Properties
Atomic Radius ∝ 1/Zeff
IE₁ < IE₂ < IE₃ (Ionization Energy)
Electron Affinity: X + e⁻ → X⁻
Metallic Character: Decreases across period
Physical Chemistry Formula Sheet
Thermodynamics Chemistry Formula Sheet
ΔU = q + w (First Law of Thermodynamics)
H = U + PV (Enthalpy)
ΔG = ΔH – TΔS (Gibbs Free Energy)
ΔS = qrev/T (Entropy)
Cp – Cv = R (for ideal gas)
Chemical Kinetics
Rate = k[A]ᵐ[B]ⁿ
k = Ae^(-Ea/RT) (Arrhenius Equation)
t₁/₂ = 0.693/k (First Order)
Rate = -d[A]/dt = k[A]ⁿ
Electrochemistry
E°cell = E°cathode – E°anode
ΔG° = -nFE°cell
E = E° – (RT/nF)lnQ (Nernst Equation)
W = nFE (Electrical Work)
Solutions
Molarity (M) = moles/L of solution
Molality (m) = moles/kg of solvent
ΔTb = Kb × m (Boiling Point Elevation)
ΔTf = Kf × m (Freezing Point Depression)
π = iMRT (Osmotic Pressure)
Gas Laws
PV = nRT (Ideal Gas Law)
P₁V₁/T₁ = P₂V₂/T₂ (Combined Gas Law)
P₁V₁ = P₂V₂ (Boyle’s Law)
V₁/T₁ = V₂/T₂ (Charles’s Law)
Ptotal = P₁ + P₂ + P₃ (Dalton’s Law)
Chemical Equilibrium
Kc = [Products]/[Reactants]
Kp = Kc(RT)^Δn
ΔG° = -RTlnK
Q vs K: Q < K (forward), Q > K (reverse)
Organic Chemistry Formula Collection
Hydrocarbons
Alkanes: CnH2n+2
Alkenes: CnH2n
Alkynes: CnH2n-2
Cycloalkanes: CnH2n
Benzene: C6H6
Functional Groups
Alcohol: R-OH
Aldehyde: R-CHO
Ketone: R-CO-R’
Carboxylic Acid: R-COOH
Ester: R-COO-R’
Isomerism
Structural Isomers: Same molecular formula
Stereoisomers: Same connectivity
Enantiomers: Non-superimposable mirror images
Diastereomers: Non-mirror stereoisomers
Reaction Mechanisms
SN1: Rate = k[R-X]
SN2: Rate = k[R-X][Nu]
E1: Rate = k[R-X]
E2: Rate = k[R-X][Base]
Biomolecules
Glucose: C6H12O6
Amino Acids: R-CH(NH2)-COOH
Fatty Acids: CH3(CH2)nCOOH
DNA: A-T, C-G base pairs
Polymers
Addition Polymerization: nM → (M)n
Condensation: Elimination of small molecules
Degree of Polymerization: n = Mn/Mo
Nylon 6,6: Polyamide
Chemistry Formula Sheet for NEET PDF
Essential NEET Chemistry Formulas
This specialized chemistry formula sheet for NEET PDF preparation includes the most important formulas tested in medical entrance examinations. These formulas cover all three branches of chemistry with emphasis on NEET-specific applications.
Atomic Structure
25+ Formulas
Chemical Bonding
30+ Formulas
Thermodynamics
20+ Formulas
Organic Chemistry
40+ Formulas
Quick Reference Chemistry Formula Chart
Constants & Units
R = 8.314 J mol⁻¹ K⁻¹
F = 96485 C mol⁻¹
NA = 6.022 × 10²³ mol⁻¹
h = 6.626 × 10⁻³⁴ J s
c = 3.0 × 10⁸ m s⁻¹
Conversion Factors
1 atm = 101.325 kPa
1 cal = 4.184 J
0°C = 273.15 K
1 L = 1000 mL = 1 dm³
1 mol gas = 22.4 L (STP)
Common Equations
λ = h/mv (de Broglie)
E = hν = hc/λ
1/λ = R(1/n₁² – 1/n₂²)
ΔE = q + w
PV = nRT
How to Use This Chemistry Formula Sheet Effectively
Study Tips
- Practice derivations of key formulas
- Understand units and dimensional analysis
- Create mind maps linking related formulas
- Solve numerical problems regularly
- Review formulas before exams
Exam Strategy
- Memorize fundamental constants
- Focus on high-weightage topics
- Practice time management
- Check units in calculations
- Verify answers using different methods
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