AFOQT Practice Test

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How does the disallowance of a chemical reaction manifest in physical changes?

  1. Substances become completely new

  2. Substances retain their chemical identity

  3. Only their appearance changes

  4. Atoms rearrange into new structures

The correct answer is: Substances retain their chemical identity

The disallowance of a chemical reaction indicates that substances do not undergo a transformation at the molecular level; rather, they maintain their chemical identity. When a physical change occurs, such as changes in state (like melting, freezing, or boiling), the chemical composition of the substances remains unchanged. For example, when ice melts to become water, the molecules of H2O remain the same, just in a different state. Physical changes may affect the size, shape, or phase of a substance, but the underlying chemical structure and properties remain intact, thereby preserving their chemical identity.

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