What are the key differences between chemical and physical changes?
Answer (1)
26th Jul, 2022
Chemical Change: Difficult or impossible to reverse, Production of a gas (bubbles, fizzing, smoke), Formation of a precipitate (a solid forming in a liquid solution), Color change (unexpected and significant), Temperature change (getting hotter or colder without external heating/cooling), Production of light or sound.
Physical Change: Change in size or shape, State change (solid, liquid, gas), Dissolving (sometimes, see specific dissolving examples below), Easily reversible (often, but not always).
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