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Question

Give an example of a decomposition reaction.


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Solution

Decomposition reaction

  1. Decomposition reaction is the reaction in which the reactant is broken down into small fragments, to form product.
  2. Decomposition reactions result in the breakdown of a complex substance into two or more simpler substances.
  3. In combination reaction two or more reactant combines to form product, hence it is opposite of combination reaction.
  4. Decomposition reaction occurs when electricity, heat or light is applied to a substance.

Examples of Decomposition Reaction:

  1. Water in the presence of electricity splits to form hydrogen and oxygen.

H2O(l)WaterH+ElectricityH2(g)Hygrogen+O2(g)Oxygen

The above diagram represents the splitting of water into hydrogen and oxygen.

2. Carbonic acid is an ingredient in soft drinks. Carbonic acid decomposed to produce water and Carbon dioxide. The equation for this reaction is:

H2CO3(aq)CarbonicaciddH2O(aq)water+CO2(g)Carbondioxide

This is the reason when you open a carbonated drink, carbon dioxide fizzes out.


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