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JEE • Chemistry

Chemical Kinetics & Radioactivity

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mixed

Rate of Reaction

The source defines reaction rate and shows average and instantaneous rate on a concentration-time graph.

Rate=ΔcΔt=mol lit−1 time−1=mol dm−3 time−1\text{Rate}=\frac{\Delta c}{\Delta t}=mol\ lit^{-1}\ time^{-1}=mol\ dm^{-3}\ time^{-1}
rav=−Δ[R]Δt=−c2−c1t2−t1r_{av}=-\frac{\Delta [R]}{\Delta t}=-\frac{c_2-c_1}{t_2-t_1}
rinst=lim⁡t→0ΔcΔt=dcdt=−d[R]dt=d[P]dtr_{inst}=\lim_{t\to0}\frac{\Delta c}{\Delta t}=\frac{dc}{dt}=-\frac{d[R]}{dt}=\frac{d[P]}{dt}
concentration-time rate
t[R]0slope

Notes

  • The source labels instantaneous rate as the slope of the concentration-time curve.