Question

defenation of exothermic and endothermic.

Answer 1

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Answer :-


✳️ Exothermic :

A change during which heat is given out (I. e., evolved) is called an exothermic change.


Example :

Burning of paper, Burning of coal.


✳️ Endothermic :


A change during which heat is taken in (I. e., absorbed) is called an endothermic change.


Example :

Dissolution of glucose.


✴️Changes in state:

✳️ Energy changes take place during a change in state . A solid absorbs heat in order to melt and the liquid absorbs heat in order to change into vapour . Thus , these are endothermic changes.



✳️ On being cooled , gases and vapours condense and liquids freeze . Heat is given out in this process. So , these are exothermic changes .



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Answer 2

Exothermic : An exothermic process releases heat, causing the temperature of the immediate surroundings to rise.

Endothermic : An endothermic process absorbs heat and cools the surroundings.

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