HELP!!! Balancing Double Displacement Reactions???

I want to make sure I am doing them correctly. I have tried a few these on my own, but I'm not sure if there right?





Use (g) or (s) to indicate gases and precipitates. Write no reaction if no evidence was observed for balancing the equation.





For evidence of reaction, write (a)"Precipitate formed"(include color);(b)"Gas involved";(c)"Heat involved";(d)"No reaction observed."





Evidence of each Reaction below:


1.) NaCl + KNO3 --%26gt; NaNO3 + KCL = no reaction?





2.)NaCl +AgNO3 --%26gt; NaNO3 + AgCl





3.) Na2 CO3 + HCL --%26gt; 2NaCl + 2HCO3?





4.)NaOH + HCl --%26gt; NaCl + H2O ?





5.)CuSO4 + Zn(NO3)2 --%26gt; This is what I got for this one: CuNO3 + ZnSO4. So the evidence of reaction would be "no reaction" since they are both soluble in water right?


6.)NH4OH + H2SO4 --%26gt;


I got: 2NH4OH + H2SO4 --%26gt;


7.) NaOH + HNO3 --%26gt;


8.)FeCl3 + NH4Oh --%26gt;


9.)Na2SO3 +HCl --%26gt;





Formation of what three classes of substances caused double displacement reactions?


a.)


b.)


c.)





Write the equation for the decomposition of sulfurous acid?

HELP!!! Balancing Double Displacement Reactions???
1) correct


2) AgCl is a white precipitate


3) heat involved since this is an acid base reaction and it should be 2NaCl +H2CO3


4) heat involved


5) should be Cu(NO3)2 since copper is 2+ here and there should be a blue color to the solution- but possibly no reaction since they are both water soluable- but still solution is blue.


6) here 2NH4OH+H2SO4= 2H2O +(NH4)2SO4 heat involved- acid base reaction


7) NaOH+HNO3 --%26gt; H2O +NaNO3 heat involved


8)FeCl3+ 3NH4OH--%26gt; Fe(OH)3 (solid)+ 3NH4Cl


9) complicated- Na2SO3 +2HCl--%26gt; 2NaCl +H2SO3--%26gt; 2NaCl + SO2(gas) +H2O





sulfurous acid is H2SO3 --%26gt; H2O+SO2
Reply:if a gas is formed, a solid is formed, or water formed then it is a double displacement reaction