What is a sample of matter either a single element or a single compound that has a definite chemical and physical properties?

a pure substance! ;)

yes, element are single type of matter or pure substances that is made up of one type of atom only.

Physical properties are about what properties that particular kind of matter, be it a material or a subatomic particle, has in itself. This is things like charge, melting point, mass, density....

Yes they do. if the chem. props. were diff, the element wouldn't be stable and you could never make it into a compound because it would have a different result in changes every time.

specimen