Question:
in exothermic reaction, heat is not absorbed then how chemical reaction takes place?
Answer:
For every chemical reaction to take place, it is not necessary that reactants should be heated. Also in case of exothermic reactions, net energy change is release of heat which means that energy absorbed is less than energy released. If you want to understand in more details refer to the following videos:
1) https://youtu.be/7kWsui9CMdA?si=O1sW5gqv8kMNKYVX
Timestamp - Watch from here 22:08
Then watch this video:
2) https://youtu.be/j_w9hh8-RJw?si=IwVXgOO5Zc8hUNeK
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