Is the process of bananas ripening a chemical change or a physical change?

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Physical changes are those changes where the chemical composition remains the same, even though the appearance or phase may change. Conversion of water to ice or vapors is a physical change, since it still stays water (H2O). Chemical changes, on the other hand, are those that involve a change in the chemical composition of the substance. Burning of wood or coal is a chemical change.

Ripening of fruits, such as banana, is a chemical change. A number of changes take place during the ripening phase. The color of the fruit changes, as does its texture. The fruit becomes soft  with the breakdown of its constituents. The sugar content of the fruit changes, and the fruit becomes sweeter. 

Given all these changes in the chemistry of banana, one can safely term the ripening process as chemical change.

Hope this helps. 

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Physical changes refer to those that involve a change in physical properties, some examples of these are melting, evaporation, freezing, sublimation, change in crystalline state, change in texture, change in concentration, etc. Chemical changes refer to the changes in chemical properties of substances, it could involve breaking down of substances into their constituent chemicals or formation of new chemicals when other chemicals combine together.

The ripening of bananas includes both chemical as well as physical changes. As a banana ripens there many physical changes involved, some of these include the change in texture of the banana; some parts soften, others are destroyed with the formation of new parts. The chemical changes involved include the formation of simpler sugars from the complex carbohydrates that constitute raw bananas, formation of new chemicals that result in a change in color and taste among many others.

There are hundreds of chemical as well as physical changes involved in the ripening of bananas.

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