[spickid]

Lead(II) nitrate and sodium chloride; Pb2+(aq) + 2Cl-(aq)  PbCl2(s)
 Copper(II) sulfate and ammonium carbonate; No reaction occurs.
Magnesium chloride and sodium hydroxide; Mg2+(aq) + 2OH-(aq)  Mg(OH)2(s)
Ammonium sulfate and barium nitrate; Ba2+(aq) + SO42-(aq)  BaSO4(s)
  Calcium acetate and sodium carbonate; Ca2+(aq) + 2C2H3O2-(aq)  Ca(C2H3O2)2(s)

True or false statements

I used a solubility chart, and they all seem to be TRUE to me.
But it's incorrect. What have I overlooked? thank you!

[AWK]

http://en.wikipedia.org/wiki/Copper(II)_carbonate

[spickid]

thank you!
So that creates a precipitate. So the answer is false.

The other one that I'm slightly not sure of is Calcium acetate and sodium carbonate; Ca2+(aq) + 2C2H3O2-(aq) --> Ca(C2H3O2)2(s)
It doesn't seem true to to me 

[Borek]

You have started with calcium acetate, so it is unlikely as a product. What other combinations of anions and cations can for a salt?

[Arkcon]

I gotta say, sadly, you have to re-read the chart more carefully, or get a better chart, or start with some of the general solubility rules.  Simply put some of those are obviously insoluble, based purely on experience.  I would start with the solubility rules, they'll keep you from making gross errors, then you can use the chart for more obscure salts.