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In relation to melting / freezing points, energy will be required to break bonds (think heating up an ice cube to make it into water). The energy released when bonds are formed is less obvious, but the climate on a humid day is probably a clue.
Breaking a bond requires energy. Forming a bond releases energy. This is due to the fact that bonds form to allow atoms to be in the lowest energy (stable) position. Breaking a bond would cause two previously bound atoms to now be separate, and this may be an unstable position for the atoms. So, breaking bonds can sometime be unfavorable and require energy. On the other hand, forming bonds might allow two separated atoms to be in a lower energy state, and this is exothermic.
It helps me to think of the molecules as they exist in a. stable state. For example, if you are disrupting this state to break bonds, then energy is required. However, if more bonds need to form to maintain stability within the molecule, no energy is needed, but rather it is released in the process.
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