Click the link to my blog where I discuss this in detail.
You mean density less than 1 gram per cubic centimeter. The definition of the SI unit: Density of water is 1000kilograms per cubic, that is 1 gram per cubic centimeter. So, a material with a density less than water means that it swims in water and does not sink.
In contrast, fossil fuels can have a significant impact on water resources: both coal mining and natural gas drilling can pollute sources of drinking water, and all thermal power plants, including those powered by coal, gas, and oil, withdraw and consume water for cooling.
Sun light, carbon dioxide and water make for life to exist. Sun rays cause a chemical reaction to occur in plants (photosynthesis) that turns carbon dioxide and water into simple sugars and oxygen. Animals need plants for food. Oil was formed over 20 million years ago, from dead animals and plants. Some of our oil is from plant and animal life that existed over 300 million years ago.
Well, some planets, such as Mercury, have little density. For example, the amount of density in oil compared to water. That scenario is an example of the amount of density that you might expect on such planets as Venus.
It is a physical change because the oil and the water do not change in chemical composition.
Yes
Physical, the sand and oil can be separated.
is water and oil a physical change or chemical change.
physical- there's no chemical change.
When oil and water mix it is due to an emulsifier being added to the solution. The emulsifier has one hydrophobic tail which will attach to the oil and one hydrophilic tail which attaches to the water. It is more of a chemical change than a physical one since the oil and water don't change state, however they will not form an emulsification without an aid so its technically not due to a chemical reaction between the water and oil alone either.
No, it is a physical process.
Oil floating on water is not a "change", so asking whether it's a physical change or a chemical one is nonsense. To the extent there's any meaning at all to the question, it's a phenomenon caused by the physical properties of the two materials.
chemical change. the dressing and mayonnaise changed completely to form the sauce.
very bad! change the oil
Yes.
why is using detergent and water to clean oil a physical change