A physical change.
evaporation
Sublimation is a physical change of state, from solid directly to gas.
The change that occurred to the water is a physical change. In this case, the water changed from a liquid state to a solid state without altering its chemical composition.
Melting a sugar cube is a physical change because the substance undergoes a change in state from solid to liquid without altering its chemical composition.
What kind of energy is involved when the matter changes state?
No, a physical change does not change an object into a different kind of matter. It only alters the form or appearance of the substance, such as size, shape, or state (solid, liquid, gas), without changing its chemical composition.
A melting ice cube is an example of a change of state, in this case a change from the solid to the liquid form of hydrogen dioxide.
No, change of state is a physical change.
A change of state is a molecular change.
In changes in which the molecular structure of a substance remains constant, such as changes of state, we often refer to these changes as Physical Changes. If the molecular structure is altered it would be a Chemical Change.
A change in some properties of matter without forming a different kind of matter is called a physical change. This can involve changes in state, shape, size, or appearance of the substance, but the chemical composition remains the same.