Which process is a physical change?

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Study for the Georgia High School Physical Science Test. Prepare with flashcards and multiple-choice questions, detailed hints and explanations included. Get ready for your exam!

Multiple Choice

Which process is a physical change?

Explanation:
Physical changes involve altering a substance’s state or appearance without changing its chemical identity. Ice melting fits this because solid water becomes liquid water while staying H2O; no new substance is formed. Energy input loosens the rigid crystal structure so the molecules can move more freely and flow as a liquid. This change is reversible by cooling back into a solid. Other options involve chemical changes, where new substances are produced—for example, rust forms iron oxide, burning wood creates ash and gases, and photosynthesis makes glucose from carbon dioxide and water using light.

Physical changes involve altering a substance’s state or appearance without changing its chemical identity. Ice melting fits this because solid water becomes liquid water while staying H2O; no new substance is formed. Energy input loosens the rigid crystal structure so the molecules can move more freely and flow as a liquid. This change is reversible by cooling back into a solid. Other options involve chemical changes, where new substances are produced—for example, rust forms iron oxide, burning wood creates ash and gases, and photosynthesis makes glucose from carbon dioxide and water using light.

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