Q 9. What does one mean by exothermic and endothermic reactions? Give examples.
Exothermic reactions : Reactions in which heat is given out along with the products are called exothermic reactions.
Example :
Endothermic reactions:Reactions in which energy is absorbed are known as endothermic reactions.
Example : The process of photosynthesis.
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The chemical reaction that release heat and kinetic energy is called exothermic reaction