Question

Photosynthesis and digestion of food are chemical changes. Justify

Answer 1

HEY MATE, HERE IS UR ANSWER:-

photosynthesis and digestion of food are chemical changes because it is non reversible change. That is food is converted into energy by chemical process.

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Answer 2

The changes that are involved in the process of Photosynthesis and digestion of food are called as chemical changes.

In addition to this, burning of coal also comes under chemical change.

If you leave these substances for some time in the open air or when is exposed to the air, then it turns into brownish substance.