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FCAT Grade 8 Science Assessment Practice Questions

Category - FCAT Science Assessment Grade 8

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Which of the following best describes a decomposition reaction?
  1. A reaction in which the oxidation state of one species changes.
  2. A reaction in which a solid product is formed.
  3. A reaction in which a gaseous product is formed.
  4. A reaction in which a molecule is reduced to its individual elements.
  5. A reaction in which two reactants become a single product.
Explanation
Answer: D - A decomposition reaction is one in which a single molecule is reduced to its individual elements. This can be either elements in their natural state (in the periodic table) or a reaction in which a very large molecule is broken into several smaller molecules.
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