Physical changes alter form without changing substance identity

Steps:

• Recall that physical changes affect appearance or state but not chemical composition.
• Evaluate option A: Reversibility isn't guaranteed for all physical changes.
• Evaluate option B: Changes in appearance, like melting ice, fit the definition.
• Evaluate options C and D: These describe chemical changes or ignore energy involvement.

Why B is correct:

• Physical changes rearrange particles without forming new substances, often altering visible properties like shape or state, per the definition in chemistry.

Why the others are wrong:

• A: Some physical changes, like crushing a solid, are irreversible.
• C: New substances form only in chemical changes, not physical ones.
• D: Energy is absorbed or released in physical changes, such as during phase transitions.

Final answer: B