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Energy Changes: Bond Energy Calculations

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Total cards: 8•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (8)

#1
Front (Question)

What is meant by bond energies?

Back (Answer)

The amount of energy required to break 1 mole of a particular covalent bond.

#2
Front (Question)

Is breaking bonds an endothermic or exothermic process and why?

Back (Answer)

Endothermic It requires energy from the surroundings.

#3
Front (Question)

Is forming bonds an endothermic or exothermic process?

Back (Answer)

Exothermic It releases energy to the surroundings

#4
Front (Question)

What formula would you use to calculate the overall energy change in a reaction?

Back (Answer)

Energy required to break bonds - energy released forming bonds

#5
Front (Question)

If the value of the overall energy change in a reaction is negative, is the reaction endothermic or exothermic?

Back (Answer)

exothermic energy has been lost to the surroundings

#6
Front (Question)

If the value for the overall energy change energy change in a reaction is positive, is the reaction endothermic or exothermic?

Back (Answer)

endothermic energy has been taken into the reaction from the surroundings

#7
Front (Question)

Calculate the overall energy change in the following reaction. Is it endothermic or exothermic? N2 +3H2 → 2NH3

Back (Answer)

Energy required to break bonds = 2249 Energy released by forming bonds: 2346 Overal energy change = 2249 - 2346 = -97kJ/mol Exothermic

#8
Front (Question)

How much energy is required to break the bonds in the following reaction?\ H2 + Cl2 → 2HCl

Back (Answer)

436 + 242 = 678kJ/mol