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what are the examples of enothermic and exothermic reactions ?

Endothermic reactions

    Photosynthesis

    Photosynthesis is the chemical reaction that takes place in plants, which uses energy from the sun to change carbon dioxide and water into food that the plant needs to survive, and which other organisms (such as humans and other animals) can eat so that they too can survive. The equation for this reaction is:

    Photosynthesis is an endothermic reaction because it will not happen without an external source of energy, which in this case is sunlight.

Exothermic reactions

    Combustion reactions - The burning of fuel is an example of a combustion reaction, and we as humans rely heavily on this process for our energy requirements. The following equations describe the combustion of a hydrocarbon such as methane :

    This is why we burn fuels for energy, because the chemical changes that take place during the reaction release huge amounts of energy, which we then use for things like power and electricity. You should also note that carbon dioxide is produced during this reaction. Later we will discuss some of the negative impacts of on the environment. The chemical reaction that takes place when fuels burn therefore has both positive and negative consequences.


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