Question

Combining 50 ml of vinegar with 500 ml of milk causes the vinegar, which is an acid, to react with the milk. The milk sours and thickens, creating cottage cheese. What kind of change is this?


physical


potential


chemical


mechanical

Answer 1

The change that occurs when vinegar is combined with milk, causing the milk to sour and thicken into cottage cheese, is a **chemical change**. This is because the reaction between the acid in the vinegar and the proteins in the milk leads to a transformation in the substance's chemical composition.