Balancing Chemical Equations?

Question

-aqueous zinc hydroxide reacts with aqueous phosphoric acid to form aqueous zinc phosphate and water
-iron(III) chloride reacts with aqueous calcium hydroxide to form Iron(III) hydroxide and solid calcium chloride
-aqueous silver nitrate reacts with solid copper to form aqueous copper(II)nitrate and solid silver
-aqueous sodim sulfide reacts with aqueous cadium nitrate to form solid cadium sulfide and aqueous sodium nitrate
-sodium cyanide reacts with aqueous sulfuric acid to form hydroxide cyanide gas and aqueous sodium sulfate
-aqueous barium chloride reacts with aqueous potassium carbonate to form a precipitate of barium cabonate and aqueous potassium chloride
-solid iron(II) sulfide reacts with aqueous hydrochloric acid to form hydrogen sulfide gas and aqueous iron (II) chloride
-liquid heptane (C7H16) is burned and produces carbon dioxide and water as the products

Answer 1

3Zn(OH)2 + 2H3PO4 --> Zn3(PO4)2 + 6H2O

FeCl2 + Ca(OH)2 --> Fe(OH)2 + CaCl2

2AgNO3 + Cu --> Cu(NO3)2 + 2Ag

Na2S + Cd(NO3)2 --> CdS + 2NaNO3

2NaCN + H2SO4 --> 2HCN + Na2SO4

BaCl2 + K2CO3 --> BaCO3 + 2KCl

FeS + 2HCl --> H2S + FeCl2

C7H16 + 11O2 --> 7CO2 + 8H2O

Answer 2

H2 + Br2 = HBr & HBr You have to make sure that there is the same amount of elements on each side of the equation. so for this equation it makes 2 molecules of HBr because ther are 2 of each element on the other side of the equation.

Answer 3

I think you need to do your own homework. If you have specific questions or issues with these that you don't understand, ask...Otherwise, figure out the chemical formulas for the compounds involved, write the equation and then balance the various atoms and ions involved.