Q 1. Sarita while helping her mother in kitchen work noticed that the slices of potato and brinjal have acquired a brown colour. She asked her mother reason behind this change. Her mother said whenever we keep cut pieces of these vegetables open for long time they acquire such colour.
(a) Are cutting vegetables and change in colour, physical or chemical changes?
(b) Why vegetables acquired brown colour?
(c) Do this brown colouration indicate that the vegetables are spoilt. Can we reverse this process? Why?
(d) Can you suggest ways to avoid this colouration of vegetables?
(e) What value of Sarita is shown here?
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(a) Cutting vegetables is physical change and change in colour of vegetables is chemical change.
(b) Vegetables acquire brown colour due to chemical reaction and thus, formation of new substance.
(c) No, vegetables are not spoilt and we cannot reverse this process because it is a chemical change.
(d) 1. By not keeping cut vegetables for long time to exposed air.
2. By dipping cut vegetables in cold water.
(e) Sarita is helping in nature, thoughtful and inquisitive.
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