We often see changes around us and get confused about the change being a Physical or a Chemical changes .When leaves become OLD they become YELLOW and fall. Is this a Physical or is it a Chemical changes ?
In autumn when we see dry and yellow leaves falling all around us, we feel that it is happening only because of changing season and that this is just a physical change. However, this is not the case.
-The yellowing of leaves is a Chemical Change.
-Chlorophyll is responsible for the green color of the leaves.
-However leaves also contain yellow and orange pigments which are masked or hidden by the green chlorophyll .
-During dry seasons the leaves undergo a chemical reaction in which the chlorophyll breaks down . When chlorophyll breaks down, the green color disappears, and the yellow to orange colors become visible and give the leaves the part of their fall splendor.
So when the weather changes, some plants break down all the green pigment. This lets beautiful yellows, oranges, and reds become visible during autumn. Hence, when leaves become OLD they become YELLOW and fall. And this change is a CHEMICAL change.
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