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...P a g e chemistry notes for class chapter chemical kinetics the branch of which deals with rate reactions factors affecting and mechanism reaction is called on basis fast instantaneous completes in less than ips s time known as it practically impossible to measure speed such ionic organic substitution slow re actions long from some minutes years are rusting iron transformation diamond etc moderately intermediate between change concentration any one reactants or products per unit expressed mol l ms atm units decrease increase reactant product taken this average r can be calculated by dividing difference interval av www ncerthelp com visit all ncert solutions text videos cbse syllabus note many more at particular moment methods measuring i ph measurement ii optical activity iii pressure iv conductance slowest step was determining van t hoff nature temperature surface area radiations catalyst gas law expressions according mass action aa bb b k but experimentally observed that found depend...