Can you pls site any situation where chemistry is involved and explai it scientifically..?

Question

please site simple situations.....

exaple, food digestion..

and please dont forget to explain the situation or process scientifically..

thank you.. any answer will be a great help!

Answer 1

One of the simplest methods of digestion is to take sugars and react them with oxygen to produce carbon dioxide and water.  Plants are not able to obtain sugars like animals are, so they result to making their own sugar.  

To do so, they take carbon dioxide and water, then they use sunlight to turn these into sugar and oxygen, the reverse reaction.  Then they are able to store the sugar as food, and digest it when energy is needed.  

Thus the reaction of sugar and oxygen is exothermic, releasing energy that can be used.  In order for plants to produce sugar, they must do the reverse reaction which is endothermic or requires energy.  This is evidenced by the fact that plants need sunlight to perform this reaction.