When a substance undergoes a physical change does it create a new substance?

Describe the particles of all three phases of matter in the root beer float. (how are the particles arranged and moving? )

In which situation can a mixture always be called a solution

Sort these isotopes by whether they are most likely to undergo fusion or fission. hydrogen-3, uranium-233, plutonium-239, hydrogen-1, helium-3, plutonium-241