a
Vegetable oil is lighter than pure water, which in turn is (somewhat) lighter than white vinegar.
It would be an mixture
For pure water one can say: 1 milliliter of water weighs 1 gram. 1 milliliter of vegetable oil weighs a bit less.
both
Vegetable oil
It is a mixture.
Olive oil is a vegetable oil. You can often substitute other vegetable oils, but only experience, or a knowledgeable person can tell you it that will work for a particular recipe.
Vegetable oil is denser then water, so it floats on top. Oil is also a lipid, which is hydrophobic, meaning it does not like water. They do not mix.
No - oil and water don't mix. On top of that, it would ruin your paper.
Vegetable oil does not cause rust. It is slightly acidic, its similar to a lubricant and it can prevent rust.
No water is heavier then oil.
No, vegetable oil is not soluble in water. It is a non-polar substance, while water is polar, leading to their inability to mix. When combined, vegetable oil will form a separate layer on top of the water due to its lower density. This is why oil and water do not blend well together.