When an atom bonds with another atom to form a molecule, what is the best classification for this process?

• A. Formation of a chemical bond
• B. Decomposition reaction
• C. Redox reaction
• D. Physical change

Answer: (A)

Verified step by step guidance

1. Understand that when two atoms come together to form a molecule, they are undergoing a process that involves the interaction of their electrons to create a stable connection.
2. Recognize that this process is called the formation of a chemical bond, which can be covalent, ionic, or metallic depending on the atoms involved.
3. Differentiate this from a decomposition reaction, which involves breaking down a compound into simpler substances, not forming one.
4. Distinguish it from a redox reaction, which specifically involves the transfer of electrons and changes in oxidation states, not just bond formation.
5. Note that a physical change involves changes in state or physical properties without altering the chemical identity, so forming a bond is a chemical change, not a physical one.