|A great demonstration of the action of an inorganic catalyst on the rate of a chemical reaction is the "Serpent".||
To conduct this activity you will need a:
- pneumatic trough
- Potassium iodide crystals
- 33% hydrogen peroxide
- Dishwashing liquid
- Green food dye.
- 100ml measuring cylinder
Place 20ml of hydrogen peroxide solution in the measuring cylinder. Add detergent (about 6 ml) and a few drops of green food dye. Place the mesuring cylinder in the trough and add a small spatula full of KI crystals.
Click to see a 120kb movie of the serpent.
The demonstration shows vividly
the increase in the rate of the reaction represented by the equation
|Fill the measuring cylinder.
Is this reaction exothermic or endothermic?
Do the products contain more energy than the reactants?