Question

What is decomposition reaction?

Answer 1

• When a single reactant decomposes to form two or more products is called decomposition reaction.

Answer 2

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Answer

DECOMPOSITION REACTION

• A decomposition reaction is a reaction in which a compound breaks down into two or more simpler substances. Most decomposition reactions require an input of energy in the form of heat, light, or electricity.

☞ Equation

• A decomposition reaction occurs when one reactant breaks down into two or more products. This can be represented by the general equation: AB → A + B. Examples of decomposition reactions include the breakdown of hydrogen peroxide to water and oxygen, and the breakdown of water to hydrogen and oxygen.

☞ Analogy

• In a decomposition reaction, a larger substance breaks apart and forms two or more simpler substances. A good analogy in our dancers analogy, boy A steps on girl B's toe. She gets upset and walks away.

☞ Reverse

• Combination reaction is the one in which two or more elements combine to form one single compound under the action of physical factors. Decomposition or Decombination reaction is the one in which a compound is broken to form it's constituents molecules or atoms or elements under the action of physical factors.

☞ Enthalpy change

• For the decomposition reaction, energy is a reactant, energy is absorbed during the reaction. The decomposition reaction is endothermic so the sign of the enthalpy change term (ΔH) will be positive (+).