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Chemical Kinetics formula sheet

Every formula in the Chemical Kinetics chapter for JEE Main, with one line on when it applies. Topic 1 is open to everyone; sign in free to read all 23 and download the PDF.

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How we count: 7× asked means 7 past JEE Main questions in the PrepWiser bank needed that formula, and "last" is the latest year one appeared. ★ marks formulas asked 8 or more times.

Rate of a reaction

Average and instantaneous rate
2× asked, last 2026
rav=−Δ[R]Δt=Δ[P]Δt,rinst=−d[R]dtr_{\text{av}}=-\frac{\Delta[\mathrm R]}{\Delta t}=\frac{\Delta[\mathrm P]}{\Delta t},\qquad r_{\text{inst}}=-\frac{d[\mathrm R]}{dt}
mol L−1^{-1} s−1^{-1} (gases: atm s−1^{-1}). Instantaneous: slope of the tangent. Depends on concentration, not amount.
Rate from each species
5× asked, last 2026
aA+bB→cC:r=−1ad[A]dt=−1bd[B]dt=1cd[C]dta\mathrm A+b\mathrm B\to c\mathrm C:\quad r=-\frac1a\frac{d[\mathrm A]}{dt}=-\frac1b\frac{d[\mathrm B]}{dt}=\frac1c\frac{d[\mathrm C]}{dt}
Divide by the coefficient; minus for reactants. 2 NX2OX5→4 NOX2+OX2\ce{2N2O5 -> 4NO2 + O2}: NOX2\ce{NO2} forms twice as fast as NX2OX5\ce{N2O5} goes.
Volume change
3× asked, last 2026
V→V/f:  each gas concentration×f,r→f n rV\to V/f:\ \ \text{each gas concentration}\times f,\qquad r\to f^{\,n}\,r
nn = overall order. Only TT and a catalyst change kk.

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20 more formulas in 5 topics

Rate law, order and molecularity; Finding the order; Zero- and first-order reactions; Temperature and the Arrhenius equation; and Energy profiles, collisions and catalysts. Read the first part free. Sign in free with Google to read the rest and download the PDF.

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Rate law, order and molecularity

  • Rate law6×
  • Units of k5×
  • Molecularity2×
  • Rate-determining step3×

Finding the order

  • Initial-rate method9×
  • Half-life method10×
  • Graphs for the order15×

Zero- and first-order reactions

  • Zero order9×
  • First order12×
  • First-order half-life26×
  • Two first-order decays4×
  • Gas phase, by pressure10×
  • Pseudo-first order3×

Temperature and the Arrhenius equation

  • Arrhenius equation11×
  • Two temperatures14×
  • ln k against 1/T9×
  • Lowering Ea6×

Energy profiles, collisions and catalysts

  • Energy profile7×
  • Collision theory3×
  • Catalyst4×

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About 155 past JEE Main questions from this chapter, with instant answer checking and step-by-step solutions where available. Free, and you can start without signing up.

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Version 1, October 2026. Free to share for study, as it is. Please don't sell it or remove the PrepWiser name.

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