Because oil and vinegar are not miscible. -(you can shake or stir them together, but they soon separate.)
Suspension
vinaigrette
No, the separation of salad dressing into layers after standing is not a chemical change; it is a physical change. This separation occurs because the oil and vinegar (or other components) do not mix uniformly, leading to the formation of distinct layers. When stirred or shaken, the dressing can be re-emulsified, indicating that the individual components maintain their original properties.
Salad dressing.
It is necessary to shake an oil and vinegar salad dressing before adding it to a salad because they separate easily.
Salad dressing is in the fat category...
eating a dry salad / vinegar
no
No. Salad dressing is a heterogeneous mixture of oil, vinegar, and various other ingredients.
Yes there is
Heterogeneous materials can be separated as they are made from separate components. Oil and vinegar salad dressing is an example of heterogeous product.
If you can see particles (like spices) in it, it's not a solution.If it separates, it's not a solution.Italian dressing has both those properties, so it's not a solution twice over.