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Important Formulas & Reactions
Topic-wise Formula Sheets
⚡ Electrochemistry
- E°cell = E°cathode − E°anode
- ΔG° = −nFE°cell
- Nernst: E = E° − (RT/nF)lnQ
- λm = κ × 1000/M
- w = ZIt (Faraday’s law)
🔥 Thermodynamics
- ΔH = ΔU + ΔngRT
- ΔG = ΔH − TΔS
- ΔS = qrev/T
- Cp − Cv = R (for ideal gas)
- w = −PextΔV
⏱️ Chemical Kinetics
- r = k[A]ᵐ[B]ⁿ
- t½ = 0.693/k (1st order)
- t½ = 1/(k[A]₀) (2nd order)
- Arrhenius: k = Ae^(−Ea/RT)
- ln(k₂/k₁) = Ea/R(1/T₁−1/T₂)
💧 Solutions
- ΔTb = Kb × m
- ΔTf = Kf × m
- π = iMRT (van’t Hoff)
- Raoult: PA = XA × PA°
- i = 1 + α(n−1)
⚛️ Atomic Structure
- E = hν = hc/λ
- En = −13.6/n² eV (H atom)
- de Broglie: λ = h/mv
- Heisenberg: Δx·Δp ≥ h/4π
- rn = 0.529 × n²/Z Å
🧪 Solid State
- d = zM/NA × a³
- Packing efficiency FCC = 74%
- Packing BCC = 68%
- Simple cubic = 52.4%
- r(FCC) = a/(2√2)
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Important Topics
High Weightage NEET/JEE — Must Prepare
01
Organic Chemistry — Must Do
- GOC — General Organic Chemistry
- Hydrocarbons — Alkane, Alkene, Alkyne
- Haloalkanes & Haloarenes
- Aldehydes, Ketones, Carboxylic Acids
- Amines & Biomolecules
02
Inorganic Chemistry — Must Do
- Periodic Table Trends
- Chemical Bonding & Hybridization
- P-Block Elements (Groups 13–18)
- D & F Block — Transition Metals
- Coordination Compounds
03
Physical Chemistry — Must Do
- Mole Concept & Stoichiometry
- Atomic Structure & Quantum Numbers
- Thermodynamics — 3 Laws
- Chemical Equilibrium & Le Chatelier
- Electrochemistry — Nernst Equation
04
Named Reactions — Organic
- Aldol Condensation
- Cannizzaro Reaction
- Sandmeyer & Gattermann Reaction
- Gabriel Phthalimide Synthesis
- Williamson Ether Synthesis
05
Chemical Kinetics & Equilibrium
- Rate Law & Order of Reaction
- Half Life — 1st & 2nd Order
- Arrhenius Equation
- Kp, Kc & Relationship
- Buffer Solutions & pH
06
Solid State & Solutions
- Crystal Systems & Packing
- BCC, FCC, Simple Cubic
- Colligative Properties — 4 Types
- Van’t Hoff Factor
- Raoult’s Law & Deviations
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Chemistry Discoveries Timeline
Major Discoveries & Scientists in Chemistry
1661
Robert Boyle — Father of Chemistry
Boyle’s Law — Volume inversely proportional to pressure at constant temperature. First to distinguish element from compound
1789
Lavoisier — Law of Conservation
Antoine Lavoisier — Mass is conserved in chemical reactions. Disproved phlogiston theory. Named oxygen & hydrogen
1808
Dalton’s Atomic Theory
John Dalton — All matter made of atoms. Atoms of same element are identical. Laid foundation for modern chemistry
1869
Periodic Table — Mendeleev
Dmitri Mendeleev arranged 63 elements by atomic mass. Predicted undiscovered elements. Modern table by Moseley 1913
1898
Marie Curie — Radioactivity
Discovered Polonium & Radium. First woman Nobel laureate (Physics 1903, Chemistry 1911). Coined term radioactivity
1909
Haber Process — Ammonia Synthesis
Fritz Haber — Synthesis of ammonia from N₂ + H₂. Revolutionized fertilizer industry. Nobel 1918. N₂ + 3H₂ ⇌ 2NH₃
1916
Lewis Theory of Chemical Bonding
G.N. Lewis — Electron pair sharing. Octet rule, Lewis dot structures. Foundation for covalent bonding theory
1965
Woodward-Hoffmann Rules
R.B. Woodward & R. Hoffmann — Rules governing pericyclic reactions. Nobel 1981. Conservation of orbital symmetry
MODERN
Green Chemistry & Nanotechnology
Sustainable chemistry — atom economy, catalysis. Carbon nanotubes, graphene, fullerenes — modern materials
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