👉 In the context of materials science, a hydrocrack is an interaction between two molecules that results in the formation of a new molecule. This process can be described as a physical change that occurs when the molecular structures are disrupted and the atoms move from one place to another. A common example of a hydrocrack is the reaction between water (H2O) and sodium chloride (NaCl), which leads to the formation of NaOH and HCl. In this case, the molecules are broken