hChemical kinetics deals with the rates of chemical processes. Any chemical process is considered to consist of number of one or more single-step step which are known as elementary reactions elementary processes or elementary steps. Elementary reactions may involve dissociation or isomerisation of a single reactant molecule, which is referred as unimolecular step. Also there may be a single collision between two molecules, which is referred as a bimolecular step.
It should be noted that majority of the reactions that are written as a single reaction equation actually consists of a series of elementary steps or process.
The main objectives for the study of chemical kinetics are:
(a) To analyze the sequence of elementary steps giving rise …show more content…
In general chemical reactivity is controlled by two broad factors:
(a) Thermodynamics: This factor allows us to answer which state is more stable whether the reactants or products and
(b) Kinetics: Thermodynamics gives the idea about the feasibility of the reaction. Also it gives the idea about the factors which controls the rate of a reaction. Practically in order for a reaction to occur, the reaction must be thermodynamically and kinetically favored. The Thermodynamic factors which control reactions are enthalpy, entropy and the temperature. The kinetic factors which controls the rate of reaction are, the concentration of reactants, the reaction mechanism, the energy barrier required to be overcome i.e. its activation energy, and temperature
Rate of a reaction
The rate of a chemical reaction, is change in concentration in unit time. Hence the rate of a reaction has units of concentration per unit time i.e. mol dm-3 s-1. For gaseous reactions, alternative units of concentration are often used, likes units of pressure – Torr, mbar or Pa). In order to determine the rate of reaction we can monitor the change in concentration of one of the reactants or products as a function of
It should be noted that majority of the reactions that are written as a single reaction equation actually consists of a series of elementary steps or process.
The main objectives for the study of chemical kinetics are:
(a) To analyze the sequence of elementary steps giving rise …show more content…
In general chemical reactivity is controlled by two broad factors:
(a) Thermodynamics: This factor allows us to answer which state is more stable whether the reactants or products and
(b) Kinetics: Thermodynamics gives the idea about the feasibility of the reaction. Also it gives the idea about the factors which controls the rate of a reaction. Practically in order for a reaction to occur, the reaction must be thermodynamically and kinetically favored. The Thermodynamic factors which control reactions are enthalpy, entropy and the temperature. The kinetic factors which controls the rate of reaction are, the concentration of reactants, the reaction mechanism, the energy barrier required to be overcome i.e. its activation energy, and temperature
Rate of a reaction
The rate of a chemical reaction, is change in concentration in unit time. Hence the rate of a reaction has units of concentration per unit time i.e. mol dm-3 s-1. For gaseous reactions, alternative units of concentration are often used, likes units of pressure – Torr, mbar or Pa). In order to determine the rate of reaction we can monitor the change in concentration of one of the reactants or products as a function of