A change in the physical environment - a change in temperature or pressure
The best way to know when a physical change is taking place is to observe. There will be a visible change in physical changes.
It is a physical change
Boiling is a physical change.
The melting of the wax is a physical change. The burning the of wick is the chemical change
Physical because no reaction is taking place.
Yes.That's a physical change only.
Chemical changes take place on the molecular level
chemical change.
Physical change.
Melting, the phase change from a solid to a liquid, is considered a physical change rather than a chemical change because when the phase change takes place, the substance that was melted does not change its chemical composition, and the process could be reversed to get the original condition of the substance by freezing (liquid-solid).
It is a physical change because when salt is added to water,it is dissolved in it which only changes its physical appearance.
Dissolving salt in water is an example of a physical change. Although the ions of sodium and chlorine separate when the salt dissolves, no chemical reaction takes place.