[emglish] start planning work requirement 4

diff --git a/chem/reactions.md b/chem/reactions.md
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@@ -32,3 +32,11 @@ Note same distribution indicates same temperature.
 **Homogenous** catalyst: same state as reactants and products, e.g. Cl* radicals.  
 **Hetrogenous** catalyst: different state, easily separated. Preferred for manufacturing.
 ![](graphics/catalyst-graph.png)
+
+Many catalysts involve transition elements.  
+Haber process (ammonia producition) - enzymes are catalysts for one reaction each. Adsorption (bonding on surface) forms ammonia \ce{NH3}
+
+## Equilibrium systems
+
+**Equilibrium** - the stage at which quantities of reactants and products remain unchanged  
+Reaction graphs - exponential/logarithmic curves for reaction rates with time (simultaneous curves forward/back)