Answer:
Star A would have the greater absolute brightness. This is because absolute brightness finds out the actual brightness of a star at a standard distance from Earth. If Star A is twice as far from Earth as Star B but they still both appear to have the same amount of brightness.
Magnetism, or more specifically electromagnetic repulsion
I think it is not possible to make cd without plastic . because except plastic no other material is so durable for making cd.
6) Na2 SO4
7)nonmetallic elements
10)mass
11) mole
* sorry I didn't know Q. 8/9
