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AB --> A + B represents which type of chemical reaction?

  1. Synthesis

  2. Decomposition

  3. Replacement

  4. Combustion

The correct answer is: Decomposition

The equation AB --> A + B represents a decomposition reaction. In this type of reaction, a single compound (AB) breaks down into two or more simpler substances (A and B). Decomposition reactions often require energy input, such as heat, light, or electricity, to occur. This process can be seen in various real-life reactions, such as the breakdown of hydrogen peroxide into water and oxygen. Understanding this reaction type is crucial because it illustrates how complex substances can be formed from simpler components, which is a fundamental concept in chemistry. Identifying decomposition reactions helps in predicting the products of reactions and understanding how chemical compounds behave under certain conditions.