Are phase changes chemical or physical changes?

Answer 1

Corrected

Phase changes are physical, though they can take place together (or after, as a result of) a chemical reaction (but this is not necessary).

Neglect:

Chemical Because when you mix the changes it becomes chemical boom just aced that

Answer 2

A phase change, aka a change from liquid to solid, liquid to gas, etc., is a physical change. Whichever phase a material is in is dependent on it's energy (and pressure). By adding just enough energy for a phase change, the individual molecules aren't changed, and are thus not chemically changed.

Answer 3

Phase Changes are: Solid Liquid (melting/freezing) Liquid Gas (boiling/condensation) Solid Gas (sublimation (i.e. Carbon Dioxide & dry ice)) These are physical changes. I.E. the molecules remain the same, and the process can be easily reversed by changing the temperature or pressure of the system. Chemical changes actually change the molecules into something else. For example burning hydrogen and oxygen to make water. In this case the reverse reaction is relatively simple. However, that isn't always true. So, burning a long chain hydrocarbon gives off carbon dioxide and water, but it is not easy to get the original substance back.

Answer 4

Phase changes, such as melting, freezing, boiling, and condensation, are considered physical changes because they do not result in the formation of new substances with different chemical properties. Instead, the molecules maintain their chemical identity while transitioning between different states of matter.