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What does the model show?

Hydrogen peroxide will naturally decompose into hydrogen and oxygen in sunlight. However, a catalyst such as chopped up celery or manganese dioxide can be used to speed up this reaction. The catalyst doesn't get used up in the reaction.

Oxygen can be collected from this reaction under displacement. This means that a bath is used with a gas jar. Water is pushed out from a gas jar by the oxygen that is being formed. The oxygen can then be tested with a glowing splint – if oxygen is present the splint will re-light.


Making and Testing Oxygen

Demonstration Instructions

  1. Add the manganese dioxide to the acid in the flask: drag the bottle of manganese dioxide over the flask; it should show a tipping icon and the solid should be transferred when the mouse button is released.
  2. Move the gas jar into place so that the oxygen is collected. To move any object, first move your cursor over the object, then press and hold the left mouse button. The cursor changes to a cross - the dragging cursor. Move the mouse and the object will move with it. As long as the dragging cursor is shown, you can release the mouse button to place the object in a new position.
  3. When the gas jar is full, select the glowing splint from the Equipment folder (under Meters and probes). Rotate the splint as required, then quickly test the gas by raising the gas jar out of the watter, and dragging the splint into the open neck of the gas jar. The oxygen collected should cause the splint to re-light, proving that oxygen has been produced.
  4. Click onto the flask, select its atom viewer and observe the reaction happening at the atomic level.