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Why is digestion of food a chemical change, whereas chewing food is mainly a physical change?

Answer and explanation

Correct answer: During digestion, complex food changes into new, simpler substances, whereas chewing mainly changes its size and shape.

During digestion, enzymes convert complex food substances such as carbohydrates, proteins, and fats into simpler new substances. The formation of new substances is the characteristic of a chemical change. In contrast, chewing only breaks food into smaller pieces, changing mainly its size and shape without forming a new substance. Therefore, option B is incorrect.

Related tags

Chemical ReactionsDigestionPhysical ChangeChemical ChangeEnzymesClass 10 Science

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