No. An element is made up of only one type of atom. Water and oil are made up of many different types of atoms, so they do not form an element.
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Hydrogen
Water is not an element, it is a compound composed of oxygen and hydrogen. The chemical formula for it is H2O. That is 2 hydrogens and 1 oxygen atoms combined.
Oxygen combined with one other element is an oxide.
It is oxygen
Water is not an element (H is an element, O is an element, when combined together it is not an element). See related question below.
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 and water are both compounds, not elements.
water is an element, instant coffee powder is a mixture, combined it is still a mixture.
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water+coal=oil
Emulsions
No. An element is made up of only one type of atom. Water and oil are made up of many different types of atoms, so they do not form an element.
Water and oil do not mix with each other. It is a mixture.
sodium, combined with chlorine, it makes salt, but in pure form, it explodes in water
Hydrogen
the result is an emulsion.