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By Michel Soustelle

ISBN-10: 1848213026

ISBN-13: 9781848213029

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This activation leads to heterogeneous catalysis. 2. Free radicals Free radicals are unstable molecules; the instability is due to the presence of unpaired or extremely available electrons. For instance, the pyrolysis of tetraethyl lead releases ethyl radicals: Pb(C2H5)4 = Pb(C2H5)2 + 2 C2H5. R6] The tert-butyl peroxide is a compound formed from a relatively weak central bond O–O: (CH3)3COOC(CH3)3. It is thus a product that, even at ordinary temperature, tends to break down slowly. It therefore generates free radicals: (CH3)3CO°, that are likely to initiate reactions.

5. Point defects Heterogeneous reactions involving the stoichiometric participation of solids introduces point defects that are imperfections in the periodic arrangement of the atoms or ions of a crystal (see Annex 1). The main point defects are: – the vacancies: absence of an ion or atom at a point lattice in the crystal; – the interstitials: these are atoms or ions inserted between the point lattices of the crystal. 6. 3). We have implicitly admitted that there a “stoichiometry” relationship exists between the extent (and speeds) of a reaction, which is defined for each of the principal components of the reaction as: d {A1 } v1 = d {A 2 } v2 = d {A 3 } v3 = ...

In photochemistry, for instance, the excitation is provided by light radiation (visible or ultraviolet), the molecules are cut through an electron beam in a mass spectrograph, etc. Such 30 An Introduction to Chemical Kinetics reactions are characterized by their quantum yield, which is the ratio of the number of transformed molecules to the number of photons absorbed. This activation leads to photochemistry; – electrical activation: energy is provided by the electric current. These reactions are characterized by Faraday’s law, which enables us to determine the number of electrolyzed molecules for a given amount of electricity.

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An introduction to chemical kinetics by Michel Soustelle


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