A comprehensive dictionary of chemistry by Greg Willie

By Greg Willie

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By Greg Willie

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Ferroin I possible, including: Internal changes from red to pale blue ~ energy changes depend only on the initial and final states of the when oxidised. 60 firstorderreactum Iflux ================* system, not on the path taken. I The work done during an adiabatic process depends only on the initial and final states of the I system, and not on the path I taken. The internal energy: change for any cyclic process is ~ zero. I • first order reaction compare with zero order reaction and second order reaction.

Different explains reaction rates in terms ; substances in the mixture have of collisions between reactant different affinities for the staI tionary phase, and so move molecules. through the tube at different • collision frequency collision frequencies; frequency of collision. The average number of collisions that a molecule undergoes each second. 1/ =========== Chemistry II comhinRtWnrCllCtWn I concentmtWn.. rates. This allows the substances in the mixture to be detected or collected separately as they reach the end of the tube - combination reaction a reaction in which two or more substances are chemically bonded together to produce a product.

For example, the different conformations of Butane (C4H 10 ) represent different conformers. Each conformation will have an energy associated with it and the lower energy conformations will be preferred. Sometimes the barrier to rotation is great enough that the different conformers are able to be distinguished. The energy barrier to rotation needs to be 80 kJ/mol or greater for this to be observed. For example, consider 6,6'-dimethylbiphenyl2,2'-dicarboxylic acid. Rotation about the C-C single bond is prevented by the unfavourable interaction of the methyl and acid groups on adjacent rings =========--- Chemistry 11 _____ /I conjiJrnurs I c(mversWn foetor 37 *================ which must pass each other for complete rotation to occur.

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