Final answer:
When a raw egg is placed in vinegar, the albumin protein in the egg white denatures and becomes slimy and gelatinous.
Step-by-step explanation:
When a raw egg is placed in vinegar, a chemical reaction occurs between the vinegar (which is a weak acid) and the egg white (which is primarily composed of the protein albumin). The acetic acid in the vinegar denatures the albumin protein, causing it to unfold and lose its original structure. As a result, the egg white becomes slimy and gelatinous.