Question

What happen when a Pinch of magnesium 4 oxide is added to hydrogen peroxide in a test tube?​

Answer 1

In this reaction, manganese oxide is the catalyst and catalyses the decomposition of hydrogen peroxide.

MnO2 does not show itself in the equation because it is a catalyst. Catalysts typically act by either providing a lower energy pathway or are first consumed and then produced during the reaction, thus their total quantity remains unaffected.

If instead of using a solid catalyst lump, we finely grind it, the surface area of catalyst particles will increase and will speed up the reaction. This happens because the greater surface area of catalyst increases the chances of reactant particles colliding with it (for formation of catalyst-reactant intermediate which forms products and releases catalyst back).

Hence the finely divided MnO2 particles will speed up the breakdown of hydrogen peroxide.

Answer 2

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