Le Chatlier's Principle with Nitrogen Oxides, Demo #6

A good visual demonstration of the effect of temperature on the position of equilibrium.  The demonstration uses sealed 500ml glass bulbs filled with nitrogen dioxide in equilibrium with dinitrogen tetroxide.  Heating a bulb (internal pressure only 0.5atm) shifts toward nitrogen dioxide (dark red).  Cooling with liquid nitrogen shifts to dinitrogen tetroxide (pure white solid).

Iron (III) Thiocyanate Ion Equilibria, Demo #34

An equilibrium is set up which has a colored product.  Adding either reactant displaces the equilibrium toward the product (dark red).  Removing either reactant shifts the equilibrium the other way to lighten the color.