Final answer:
A thermochemical bond formed due to exposure to high temperatures near the fusion point of a mixture is called a thermochemical bond. It occurs when the atoms or molecules dissociate into ions and form plasma, enabling the formation of new bonds.
Step-by-step explanation:
A thermochemical bond formed between materials as a result of exposure to temperatures approaching the fusion point of the mixture is called a thermochemical bond. Fusion refers to the process where two or more atomic nuclei combine to form a heavier nucleus and release a significant amount of energy. In the case of thermochemical bonds, the high temperatures cause the atoms or molecules in the mixture to dissociate into ions and form a plasma, which can lead to the formation of new bonds.