Chemical kinetics

Rate of Chemical Reaction formula and unit

Rate = change in concentration / time

Unit = $ML^{-1}S^{-1}$

Rate = -∆[R]/∆T

Rate law

Rate $\alpha$ [A][B]

Rate = K[A][B]

Eg of first order reaction

$$NH4NO2\rightarrow2H2O+N2$$

$SO2Cl2\rightarrow SO2+Cl2$

Eg Second order reaction

$$2NO2\rightarrow2NO+O2$$

CH3COOC2H5 + NaOH —> CH3COONa + C2H5OH

Eg Third order Reaction

2NO + O2 —→ 2NO2

2NO + Br2 —→ 2NOBr

Zero order Reaction eg

H2 + Cl2 —hu→ 2HCL

2NH3 —-pt--→ N2 + 3H2

2HI —-Au-→ H2 + I2

Molecularity of reaction

NH4NO2 $\rightarrow$ N2 + 2H2O (unimolecular)

CH3COOH + NaOH $\rightarrow$ CH3COONa + H2O (Bimolecular)

2NO +O2 $\rightarrow$ 2NO2 (Trimolecular)

1st Order Reaction formula

Half life for 1st order Reaction

Rate eqn for zero order

Half life for zero order

Pseudo first order reaction

CH3COOC2H5 + H20 —→ CH3COOH + C2H5OH

Unit 1st order

$$S^{-1}$$

2nd order unit

$$M^{-1}LS^{-1}$$

3rd order unit

$$M^{-1}L^2S^{-1}$$

Zero order unit

$$M^{}L^{-1}S^{-1}$$