Collision theory: According to collision theory, a reaction takes place because the molecules collide with each other. The number of collisions that take place per second per unit volume of the reaction mixture is called collision frequency. At ordinary temperature and pressure, the value of collision frequency ...

Pseudo unimolecular reactions: Consider the following acid catalysed reactions: 1. Hydrolysis of ethyl acetate: CH3COOC2H5 + H2O + H+ ----------->CH3COOH + C2H5OH 2. Inversion of cane sugar: C12H22O11 + H2O + H+ ---------------> C6H12O6 + C6H12O6 Both the above reactions are bimolecular but are found to be of first order, as experimentally it ...

1) For the first order reaction: k = (2.303 / t) log (a / a – x) When x = (40 / 100) a = 0.4 a t = 50 minutes (given) Therefore, k = (2.303 / 50) log (a / a – 0.4 a) k = (2.303 / 50) log ...

Experimental methods for determination of rate constant are discussed below: 1. Concentration change method: In this method the concentration of one of the reactants or products is measured at different times. 2. Volumetric method: In this method the volume of some gaseous product is noted at different times. E.g. In the ...

Amount of the substance left after one half life = A0 / 2 Amount of the substance left after two half lives = A0 / 22 Amount of the substance left after three half lives = A0 / 23 In general, Amount of the substance left after n half ...

Consider the two different initial concentrations and finding their half lives, the order of reaction (n) can be calculated as follows: Taking log on both sides we will get: log (t1/2) 1 - log (t1/2) 2 = n – 1 (log [A0] 2 - log [A0] 1)

Half Life Period is defined as the time taken for half of the reaction to be completed i.e. the time in which the concentration of a reactant is reduced to half of its original value is called Half Life Period of the reaction. General expression for ...

Integrated Rate Expression of Zero Order Reaction: Consider the general reaction: A ----------------> products If it is a reaction of zero order then, Rate = -d [A] / dt = k [A] 0 = k d [A] = - k dt Integrating both sides, we will get: [A] = - kt + ...

Difference between photochemical reactions and thermochemical reactions are discussed below: THERMOCHEMICAL REACTIONS PHOTOCHEMICAL REACTIONS These reactions involve absorption or evolution of heat. These reactions involve absorption of light. They can take place even in absence of light i.e. dark. The presence of light ...

The main difference between the order of a reaction and molecularity of a reaction are given below: ORDER OF A REACTION MOLECULARITY OF A REACTION It is sum of the concentration terms on which the rate of reaction actually depends or it is the ...