Yes, it is a mixture, since two or more substances are being mixed without combining chemically. It is a heterogeneous mixture since they don't mix completely.
The oil has less density
The oil-water mixture is not homogeneous.
Pour the oil and sand in a glass of water. The sand will sink to the bottom, and the oil will float to the top of the water.
Allow the mixture to sit until the oil and water have separated. Then pour off the oil.
This mixture is an emulsion.
The oil has less density
it won't cuz
when the engine is run the oil and water will make a thick pudding like mixture that will not lubricate the engine, you will need to change the oil and filter again. ( this mixture can clog the filter ) You may also need to do an engine cleaning procedure as well, that mixture will stick to everything and be there after several oil changes.
It would be called a "disaster" if we are talking about a mixture of oil and water in the crankcase of your engine. An emulsion if you are looking for a definition. _______________ Water and oil do not always form an emulsion. You can try adding oil to a glass of water or the other way round. Emulsions will only form when the mixture is shaken vigorously and soap (surfactant) is present.
Water has a fixed density (depending on temperature), and it is more dense than corn oil by a little bit. If corn oil is added to water, the density of the mixture will decrease. This applies to "room temperature" water and oil. No one should be pouring hot oil into water.
A mixture of oil and water is a mixture, not an element. If by substance you mean not a pure substance (element or compound), then oil and water would be a substance (that is a mixture). If you mean oil and water separately, then oil is a mixture of hydrocarbons, and water is a compound (pure substance).
Oil is a mixture of hydrocarbons.
Oil and vinegar is a heterogeneous mixture.
Water and oil is a heterogeneous mixture. Oil can be separated from water via specific methods. That's why a combination of water and oil is heterogeneous.
Water and oil do not mix with each other. It is a mixture.
The oil-water mixture is not homogeneous.
Yes as The amount of emulsifier in the mixture of water and oil is increased the time taken for the oil and water to separate is increased.