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University of Antique College of Teacher Education Sibalom, Antique Reporters: Jessapheer M. Nuguit Charlotte T. Antonio Dece Glaiza O. Hongco John P. Romero Year/Section: BSED 1-D Title of the report: CHEMICAL KINETICS Instructor: Ms. Rosaphine Mena CHEMICAL KINETICS It is the branch of physical chemistry that is concerned with understanding the rates of chemical reactions. It is to be contrasted with thermodynamics, which deals with the direction in which a process occurs but in itself tells nothing about its rate. Thermodynamics is time’s arrow, while chemical kinetics is time’s clock. Chemical kinetics relates to many aspects of cosmology, geology, biology, engineering, and even psychology and thus has far reaching implications. The principles of chemical kinetics apply to purely physical processes as well as to chemical reactions. RATE OF REACTION The rate of a reaction is defined in terms of the rates with which the products are formed and the reactants (the reacting substances) are consumed. For chemical systems it is usual to deal with the concentrations of substances, which is defined as the amount of substance per unit volume. The rate can then be defined as the concentration of a substance that is consumed or produced in unit time. Sometimes it is more convenient to express rates as numbers of molecules formed or consumed in unit time. Rates of reactions can be determined by monitoring the change in concentration of either reactants or products as a function of time t. [A] = concentration of reactant A For the reaction A à B there are two ways of measuring rate: (1) the speed at which the reactants disappear (2) the speed at which the products appear • Reactions are reversible, so as products accumulate they can begin to turn back into reactants.
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