11th Class Chemistry Classification of Elements and Periodicity in Properties

  • question_answer 86)   What do you understand by exothermic reaction endothermic reaction? Give one example of each type.

    Answer:

      Exothermic reaction: The chemical reaction which takes place with evolution of heat energy is called exothermic reaction. In this reaction, enthalpy change is negative. \[C(s)+{{O}_{2}}(g)\to C{{O}_{2}}(g)+393.5kJ\] \[2{{C}_{4}}{{H}_{10}}(g)+13{{O}_{2}}(g)\to 8C{{O}_{2}}(g)+10{{H}_{2}}O(g)+5316kJ\] Endothermic reaction: The chemical reaction which occurs with the absorption of energy is called endothermic reaction. In this reaction, enthalpy change is positive. \[{{N}_{2}}(g)+{{O}_{2}}(g)+180.5kJ\to 2NO(g)\] \[C(s)+2S(s)+92.0kJ\to C{{S}_{2}}(s)\] \[S<P<O<P\]                


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