chem / prac-9-aim.mdon commit [chem] add SAC prep notes (3fb1d44)
   1# Experiment 9 - Effect of temperature and pressure on equilibrium
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   3To determine the effect of the temperature and pressure of an equilirium environment on the direction of the equilibrium reaction. Temperature is tested by adding methyl violet indicator to a solution of phosphoric acid which shows the concentration of ionised H+ and H2PO4- ions. Pressure (inversely proportional to volume) is tested with dinitrogen tetroxide and the colour change is observed.
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   5N2O4(g) <-> 2NO2(g)
   6  clear <-> brown
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   8Explain colour changes - net forward/back reaction
   92 page question
  10Do not duplicate
  11
  12What was the change to equilibrium system? (do not copy method)
  13(1 mark for each test)
  14
  15Vertical lines on plots
  16(selection of graphs)
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  18Reaction conc initially > product conc
  19Two marks on x-axis - init. & funal equilibrium
  20Rule graphs
  21Lines may cross
  22
  23H33PO4 - each product concentration is equal (dissociation of acid) - one line
  24Fe3+ + SCN- - each reactant is not necessarily equal concentration
  25
  2690 marks total
  2717 marks from results
  281 mark/box on first question (table)