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ICSE Class 9 Chemistry Question 1 of 18

Chemical Changes & Reactions — Question 6

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Question 6

Chemical reactions may proceed with evolution or absorption of heat. Give an example of each.

Answer

Chemical reaction which proceed with evolution of heat [Exothermic] —

  • Nitrogen and hydrogen:
    N2 + 3H2 ⇌Δ\xrightleftharpoons{\enspace\Delta\enspace} 2NH3 + ΔT

Chemical reaction which proceed by absorption of heat [Endothermic] —

  • Nitrogen and oxygen :
    N2 + O2 →Δ\xrightarrow{\enspace\Delta\enspace} 2NO - ΔT