Chemistry Chemical Bonding BUMHS 2022
PMDC Verified Question 52 of 102
During the formation of chemical bond:
A
Energy decreases
B
Energy increases
C
Energy does not change
D
Energy first increases then decreases
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Energy decreases
Concept:

Chemical bonding is an inherently stabilizing process. Atoms bond to reach a lower, more stable energy state.

Formula:

$$ \Delta H < 0 \text{ (Exothermic process)} $$

Solution:

  • When two atoms approach each other and form a bond, the attractive forces between their nuclei and the shared electrons overcome the repulsive forces.


  • This system drops to a lower potential energy state.


  • The excess energy is released into the surroundings (exothermic), meaning the intrinsic energy of the newly bonded molecule decreases compared to the isolated atoms.


Why other options are incorrect:

  • Option B & Option C: If energy increased or stayed the same, there would be no thermodynamic driving force for the bond to form in the first place.

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