It should be identified that whether given reaction is an endothermic or exothermic step using bond enthalpy data. Concept Introduction: Exothermic reaction: Reaction is considered as exothermic if it releases energy in the form of heat. Endothermic reaction: The reaction which requires energy and absorbs in order to complete the reaction. Bond Dissociation Enthalpy Δ r H : The change in enthalpy as bond break in molecule with reactants and products in gas phase. The bond breaking process is endothermic since it requires energy to break hence Δ r H will be a positive value and the bond making process in a reaction is exothermic. The reaction enthalpy change determined by using the following equation, ΔrH = ∑ ΔH ( bonds broken ) - ∑ ΔH ( bonds formed )

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Chapter 8.10, Problem 1.1ACP

Interpretation Introduction

Interpretation: It should be identified that whether given reaction is an endothermic or exothermic step using bond enthalpy data.

Concept Introduction:

Exothermic reaction: Reaction is considered as exothermic if it releases energy in the form of heat.

Endothermic reaction: The reaction which requires energy and absorbs in order to complete the reaction.

Bond Dissociation EnthalpyΔrH: The change in enthalpy as bond break in molecule with reactants and products in gas phase. The bond breaking process is endothermic since it requires energy to break hence ΔrH will be a positive value and the bond making process in a reaction is exothermic.

The reaction enthalpy change determined by using the following equation,

ΔrH = ∑ΔH(bonds broken) - ∑ΔH(bonds formed)

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