So are like properties of matter different from physical properties?

Because I’m doing an assignment and I’m not so sure!

The sun’s mass is 2.0×10^ 30 kg, its radius is 7.0×10 5 km, and it has a rotational period of approximately 28 days. if the sun should collapse into a white dwarf of radius 3.5×10 3 km, what would its period be if no mass were ejected and a sphere of uniform density can model the sun both before and after?

In an experiment, how can i change human errors? be specific.

Explain why you think this diagram shows what happened to the carbon in the biodome.