9. What does one mean by exothermic and endothermic reactions? Give examples.
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Answer:
An exothermic reaction is a type of reaction in which heat is released. Eg. When a fossil fuel is burning heat is released.
An endothermic reaction is a type of reaction in which heat is absorbed. Eg. When a raw egg is cooked it absorbs heat from the flames of the gas and also from the pan and it's surrounding.
Hope it helps
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