What is the state of the chemical compounds of the reactions?

1) 2Cu(s) + O2(g) → 2CuO(s)
2) Fe(s) + CuSO4(aq) → Cu(s) + CuSO4(aq)
3) CuSO4(s) - 5H2O(g) → CuSO4(s) + 5H2O(l)
4) CuSO4(s) + H2O(l) → CuSO4.5H2O (s)
5) CaCl2(aq) + Na2CO3(aq) → CaCO3(s) + 2NaCl(aq)
6) Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)
7) H2O2(aq) → H2O(l) + O2(g)
A note:
Equation 3) This shows the thermal dehydration of copper sulphate pentahydrate. The H2O is liberated from the CuSO4 as steam - hence I show it as (g). You end up with a solid anhydrous CuSO4 and the steam will have condensed on cooling to H2O(l)
Equation4) I have shown the rehydration of the anhydrous CuSO4 with liquid water to produce the solid CuSO4.5 H2O which is the pentahydrate salt

Equation 7) H2O2 is invariably supplied as a solution in water - hence (aq). It decomposes to produce H2O(l) and O2(g).

If the reactants are (aq), then the products are as nicely except a precipitate is formed. Gases often sort gases yet no longer continually. Ammonia and HCl (gases) react to sort NH4Cl that's a stable. there is not any favourite rules for determining this. in basic terms ought to understand or look it up.

1) Cu solid O2 gas CuO solid
2) Fe solid CuSO4 aqueous FeSO4 solid Cu solid
3 and 4) Not sure whats going on in these two reactions. Do you mean CuSO4*5H20? If so, thats a solid.
5) CaCl2 aqueous Na2CO3 aqueous CaCO3 CaCO3 solid NaCL aqueous
6) Zn solid HCl liquid ZnCl aqueous H2 gas
7) H2O2 liquid H2O liquid O2 gas

Usually they'll tell you what the reactants are. Use Solubility Guidelines to figure out the rest. For example, all sodium, potassium, and ammonium salts are soluble in water.