It is often difficult to tell whether a reaction is exothermic (gives off heat)

Q: It is often difficult to tell whether a reaction is exothermic (gives off heat)

2CuO + NO(g) -----> Cu2O(S) + NO2(g) DHrxn = (energy required to break reactants bonds) - (energy released during formation of bond in products) if DH = -ve (exothermic) DH = +ve (endothermic) to know this , we need to know the bond energies of reactants and products.

ID: 1008807 • Letter: I

Question

It is often difficult to tell whether a reaction is exothermic (gives off heat) or endothermic (takes in heat) just by looking at it. For the following reaction, describe what information you would need to know about specific bonds (be specific about numbers of bonds, bonds breaking and being formed, etc) to tell whether the reaction is exothermic or endothermic: 2 CuO (s) + NO (g) rightarrow Cu_2O (s) + NO_2 (g) Essay answers are limited to about 500 words (3800 characters maximum, including spaces). 3500 Character(s) remaining

Explanation / Answer

2CuO + NO(g) -----> Cu2O(S) + NO2(g)

DHrxn = (energy required to break reactants bonds) - (energy released during formation of bond in products)

if DH = -ve (exothermic)

DH = +ve (endothermic)

to know this , we need to know the bond energies of reactants and products.

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It is often difficult to tell whether a reaction is exothermic (gives off heat)

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