[ Related blog post: http://www.wewwchemistry.com/2013/08/graphs-showing-effect-of-changing-conditions-on-equilibrium ] This file was updated on 15 Aug 2013. Minor changes were made to Slides 12 and 15. More substantial changes were made to Slides 26 to 45, primarily to modify the concentration-time graphs so that these were consistent with those I used in my detailed explanation on the effect of changing conditions on an equilibrium system. ~~~~~~~~~~~~~~~~~~~~ This is a summary of Chemical Equilibria, prepared according to the Singapore-Cambridge GCE A Level 9647 H2 Chemistry syllabus. It covers the differences between reversible and irreversible reactions, and explains the equilibrium state. Factors affecting equilibrium system, as applied to the Haber process, are also included.