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Digestion of food is an example of ________ (physical/chemical) change.

Digestion of food is an example of ________ (physical/chemical) change.

Grade:12th pass

1 Answers

Pawan Prajapati
askIITians Faculty 60782 Points
one year ago
A chemical change is a process that involves the chemical transformation of a chemical substance to another. Whereas, a physical is a process that does not involve any chemical transformations. Complete step by step answer: * A chemical change is a change in which one chemical substance is said to have transformed into one or more other chemical substances. These changes occur through chemical reactions, in which the molecules and the ions rearrange themselves to form different structures and thus have different properties. * They are mostly irreversible reactions but some changes are said to be reversible in nature. * A physical change is a change in which the changes affect the form of a chemical substance but does not change its chemical composition. These changes are used to separate mixtures into their constituent compound but it does not separate compounds into chemical elements or simpler compounds. * A physical change is a change that is subjected to the physical properties of a substance. Now, keeping the above definitions in mind let us answer the question. Digestion of food is a chemical change because the large macromolecules are broken down into simpler molecules by the enzymes present in the stomach and the intestines. It is a chemical change because it involves various chemical reactions. Hence the answer is chemical change. Note: For a chemical change, few things need to be kept in mind. * Colour change * Formation of a precipitate * Formation of a gas or gas bubbles * Odor or taste change * Volume change * Production of light and many such changes. For a physical change, few things need to be kept in mind. * Change in size and volume * Change in density and mass * Change in pressure * Change in temperature * Change in color * Change in texture and flexibility

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