Hey everyone, I have a summer assignment to work on for AP Chem. I encountered some problems when attempting the assignment.
The following are the directions and my answers. Can you please check my answers and if I get something wrong, can you explain it to me? THANKS IN ADVANCE!! 
Predict and balance the following metathesis reactions (double replacement) based on the solubility of the products.
1. silver nitrate + potassium chromate
Ag(NO3)3 + KCrO4 --> Ag(CrO4)3 + 3KNO3
2. ammonium chloride + cobalt (II) sulfate
2NH4Cl + CoSO4 --> NO REACTION
3. lithium hydroxide + sodium chromate
2LiOH + Na2CrO4 --> Li2CrO4 + 2NaOH
4. zinc acetate + cesium hydroxide
Zn(C2H3O2)2 + 2CsOH --> An(OH)2 + 2CsC2H3O2
5. ammonium sulfide + lead (II) sulfide
(NH4)2S + PbS --> (NH4)2S + PbS