Which of the following can be most accurately described as a decomposition reaction?


a. C₆H₁₂O₆ + 6 O₂ → 6 H₂O + 6 CO₂
b. glucose + ATP → glucose phosphate + ADP
c. 6 H₂O + 6 CO₂ → C₆H₁₂O₆ + 6 O₂
d. A + BC → AB + C

Verified step by step guidance

1. Identify the definition of a decomposition reaction: a chemical reaction where a single compound breaks down into two or more simpler substances.
2. Analyze option a: C₆H₁₂O₆ + 6 O₂ → 6 H₂O + 6 CO₂. This is a combustion reaction where glucose is broken down in the presence of oxygen to produce water and carbon dioxide.
3. Analyze option b: glucose + ATP → glucose phosphate + ADP. This is a phosphorylation reaction where glucose is phosphorylated by ATP.
4. Analyze option c: 6 H₂O + 6 CO₂ → C₆H₁₂O₆ + 6 O₂. This is a synthesis reaction, specifically photosynthesis, where water and carbon dioxide are used to produce glucose and oxygen.
5. Analyze option d: A + BC → AB + C. This is a single displacement reaction where A displaces C from BC to form AB and C.

Key Concepts

Decomposition Reaction

A decomposition reaction is a type of chemical reaction where a single compound breaks down into two or more simpler products. This process often involves the input of energy, such as heat, light, or electricity. An example is the breakdown of hydrogen peroxide into water and oxygen. Understanding this concept is crucial for identifying which reaction among the options represents a decomposition.

Photosynthesis vs. Cellular Respiration

Photosynthesis and cellular respiration are two fundamental biological processes that involve the transformation of energy. Photosynthesis converts carbon dioxide and water into glucose and oxygen using sunlight, while cellular respiration breaks down glucose in the presence of oxygen to produce water, carbon dioxide, and energy (ATP). Recognizing the differences between these processes helps in identifying the correct type of reaction in the question.

Chemical Equation Interpretation

Interpreting chemical equations is essential for understanding the reactants and products involved in a reaction. Each equation represents a specific transformation of substances, with reactants on the left and products on the right. By analyzing the equations provided in the question, one can determine which one depicts a decomposition reaction based on the breakdown of a single compound into simpler substances.