It needs 6 pages! It’s for organic chemistry

Write the chemical formula for a compound that is made of an element from group 1 and an element from group 17

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)

How many moles of water are created if 3 moles of hydrogen react completely with excess oxygen?