Name _____________
Study Guide
17 & 18
I.  Define

  1. positive catalyst -

  2.  inhibitor -

  3.  mechanism -

  4.  activation energy -

  5.  activated complex -

  6.  enthalpy -

  7.  entropy - 

  8.  Gibbs free energy formula -

  9.  dynamic equilibrium -

10.  open system - 

11.  Le Chatelier's Principle -

12.  equilibrium constant -

13.  Haber process -

14.  rate determining step -

15.  collision theory -

16.  dust explosion -


II.  Short essay
  
   1.  Explain the manner by which enthalpy & entropy affect a reaction.

   2.  Describe the relationship between Heat of Formation (    Hof ) and stability.

   3.  List four main factors which can affect the rate of a reaction.
III.  Complete the following based on the diagram below

                                       1. The activation energy for the uncatalyzed reaction is ___
                                 2. The potential energy for the activated complex of the      
            uncatalyzed reaction is __________
                                        3. The activation energy for the catalyzed reaction is _____.
                       4. The      H for the reaction equals __________
                                           5. This reaction is _____________ ( endothermic, exothermic
                                           6. This reaction is _____________ ( self-sustaining, not 
                                                 self-sustaining).

IV.  Calculate the following.

  1.)  Two moles of NH3 are introduced into a 1.0 liter vessel and allowed to decompose 
        according to the reaction  2NH3   =   N2  +  3H2
        At equilibrium one mole of NH3remains.  calculate the value for the equilibrium 
        constant.









  2.  Six moles of NH3 are initially placed in a 4.0 liter vessel and allowed to decompose as 
       noted in the previous question.  At 40oC equilibrium is reached and 0.80 mole of 
       hydrogen are present.  Calculate the K(eq) at this temperature.