When the characteristics or state (solid, liquid or gas) of a substance change but the chemical composition does not change it indicates?

Changes in state.....

The usual answer for the type of change associated with changes in phase is "physical change." The common assumption is that in a phase change, there is no change in the chemical composition of the substance. That is true, up to a point. This is what makes phase changes sit on the fence between physical and chemical changes.

Consider good old table salt, NaCl. It is a solid at room temperature and 1 atm of pressure, and it is a network solid consisting of alternating Na and Cl atoms. It is an electrical insulator. But when the solid is in the molten state it exists as free Na+ ions and Cl- ions which are no longer bound in a lattice. Bonds have been broken and ions formed. In addition, the molten sodium chloride is now an excellent conductor of electricity. Passing electricity through the molten material will produce sodium metal and chlorine gas. Since solid sodium chloride is a nonconductor and a rigid network, it will not form molten sodium metal and chlorine gas when electricity is applied.

The bottom line is that sodium chloride has vastly different physical and chemical properties as a result of a phase change which puts it on the fence between a physical change and a chemical change.

This and other reasons are why I would suggest to textbook authors to avoid any mention of physical and chemical changes or properties which are typically in the first or second chapter, at least until the student has acquired enough background to understand the nuanced differences between the two.

A.) is true.
Physical change involves no formation of new substance. As the chemical composition does not change, there is no new substance formed.

B.) is false.
Physical change involves formation of new substance(s). As the chemical composition does not change, there is no new substance formed.

C.) is false.
Global change refers to planetary-scale changes in the Earth system.

D.) is false.
There is a physical change.

The answer: A.) a physical change

Physical change

Physical change is the correct answer.