ಕಬ್ಬಿಣದ ತುಕ್ಕು ಹಿಡಿಯುವುದು ಸಾಮಾನ್ಯ ಉದಾಹರಣೆಯಾಗಿದೆ:

Rusting forms a new substance, hydrated iron(III) oxide, from iron, oxygen and water, and cannot be reversed by physical means – it is a chemical change.