AFOQT Practice Test 2026 – Complete Exam Prep

Question: 1 / 400

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

Substances become completely new

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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Only their appearance changes

Atoms rearrange into new structures

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