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What is an exothermic reaction ? Give an...

What is an exothermic reaction ? Give an example.

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1) Reactions in which heat energy is released by the reactants is called an exothermic reaction. Eg : Burning of coal.
2) when coal burnt in oxygen, carbon dioxide is produced an also large amount of heat enery is also released.
`C+O_(2)rarr CO_(2)+Q`
3) It is an exothermic reaction. Preparation of slaked lime is also an example for exothermic reaction.
`CaO+H_(2)O rarr Ca(OH)_(2)+Q`
4) If we prepare slaked lime in a beaker by addiing water to quick lime `(CaO),` the large amount of heat is released. If we touch the walls of the beaker we will fell the hotness. So, it is an exothermic reaction.
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Knowledge Check

  • In exothermic reaction

    A
    `H_(R)= H_(P)`
    B
    `H_(R) gt H_(P)`
    C
    `H_(R) lt H_(P)`
    D
    `Delta H = 0`

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