is water and oil a physical change or chemical change.
Physical ... it's only a state change. Cool it and it reverts to its old condition.
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.
Changes in state are physical changes because they involve a change in the physical appearance or state of a substance without altering its chemical composition. For example, when water changes from a liquid to a solid (freezing) or a gas (vaporization), it is still water chemically. This contrasts with chemical changes, which involve a rearrangement of atoms and result in the formation of new substances.
It is a physical change because the oil and the water do not change in chemical composition.
physical change because you are not doing anything to the object to change its ingredients or the way it is constructed and all you are really doing is adding heat.
Physical, as it remains water.
Physical ... it's only a state change. Cool it and it reverts to its old condition.
Changes of state are physical changes.
It changes from a solid to a liquid.
No it is the temperature at which water changes physical state from a liquid to a solid.
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.
Yes
It is a physical change. All phase changes are physical, not chemical. The chemical composition of water does not change when it changes from a liquid to a gas, or for that matter, to a solid.
Water because It is first solid its ice then when it melts it is liquid and when it is a gas its water vapor.
Mixing oil and water is a physical change because no new substances are formed. The molecules of oil and water remain the same, they are just physically mixed together.
no, the density of water never changes
Changes in state are physical changes because they involve a change in the physical appearance or state of a substance without altering its chemical composition. For example, when water changes from a liquid to a solid (freezing) or a gas (vaporization), it is still water chemically. This contrasts with chemical changes, which involve a rearrangement of atoms and result in the formation of new substances.