Question

1-) Read the following and answer the questions



Cut a slice of apple and keep it exposed to air for some time. Do

the same with a slice of brinjal. Does the colour of the cut

surface change? The change of colour of the cut surface is

because of the formation of new substances due to the

chemical reactions that occur between air and the enzymes in

the cut surface of apple and brinjal.



1. Name the brown coloured substance that forms over the

surface of cut apple and brinjal.


2. Identify the type of change occurring in this activity.


3. What is the importance of this activity?


4. What are the materials required to perform this activity?​

Answer 1

the brown colour substance is rust.

the change is physical change in colour

this activity shows us that when the iron objects are exposed to air they react with oxygen and water to form rust on their surfaces .

materials required are iron object , presence of air