Please help this is due today If you don’t know the answer please don’t answer and if you do I will report you

Which characteristics can be used to differentiate star systems? check all that apply.

Insoluble sulfide compounds are generally black in color. which of the following combinations could yield a black precipitate? check all that apply. na2s(aq)+kcl(aq) li2s(aq)+pb(no3)2(aq) pb(clo3)2(aq)+nano3(aq) agno3(aq)+kcl(aq) k2s(aq)+sn(no3)4(aq)

The chemical formula for emerald is be3al2(sio3)6.an emerald can be decided as