Question

a physical change... creates a new substance and cannot be undone. changes the physical properties of an object, but does not create a new substance.

Explanation:

A physical change only affects the physical properties like shape, size, state of matter etc. of a substance, without altering its chemical composition. A chemical change creates a new substance.

Answer:

The correct option is: changes the physical properties of an object, but does not create a new substance.