CHEM-UA 128 Chapter 11: Atkins CH11
31 May 2016
School
Department
Course
Professor
Document Summary
Chemical changes are always in a state of dynamic equilibrium: both the forward and reverse reactions take place, there is no net change in composition of mixture- the rate of the forward reaction equals that of the reverse. Glucose left in air is not an example of a dynamic equilibrium- it"s not in equilibrium with co2 and water. The rate of its combustion is very slow: law of mass action: at equilibrium, the composition of the reaction mixture can be expressed in the terms of the equilibrium constant, homogeneous gaseous systems: For a system with (a) molecules of a and so on; k is expressed as: (pressures are in bar) The law can be applied for species other than gases, such as liquids and solids, and solutions- in terms of activity- in this instance of species j. (all values of aj are unitless and are pure numbers).
