Some chemistry problems I don't know where to start

[korr2221]

Homework Statement

1. Circle all insoluble compounds. (5 pts) (-1 for each incorrect, to a max total of -5)

Na3PO4 CaCl2 HgCl2 LiNO3 , PbBr2 , PbCO3

(NH4)3PO4 CuCl2 Fe(OH)2 MgSO4 AgNO3 K2CO3

Given the insoluble compounds, and important exceptions list... how do I follow the question above?

2. Write the balanced net ionic equation for precipitation of CaCO3 when
aqueous solutions of Li2CO3 and CaCl2 are mixed. (2 pt)

Ca2+ (aq) + CO32- (aq) -> CaCO3 (s)

How do I do the question above? What is the things to do in order to write out the net ionic equation?

1. When ammonia is combined with hydrochloric acid, the products are:
a. NH4Cl + H2O (correct)
b. NH4Cl + OH- + H2
c. NH3Cl + H2O
d. NH3Cl + H2
e. NH4Cl + OH-

2. Considering the following reaction, what is undergoing oxidation?
Fe + ZnCl2 -> FeCl2 + Zn
a. Fe and Cl2
b. Fe and Zn
c. Fe (correct)
d. Zn
e. Cl2

3. Balance the following net ionic redox reaction:
Ca + Sb3+ -> Ca2+ + Sb
a. Ca + Sb3+ -> Ca2+ + Sb
b. 2Ca + Sb3+ -> Ca2+ + 3Sb
c. Ca + 2Sb3+ -> 3Ca2+ + Sb
d. 3Ca + 2Sb3+ -> 3Ca2+ + 2Sb (correct)
e. 2Ca + 3Sb3+ -> 2Ca2+ + 3Sb



I've looked around my textbook for examples but couldn't find anything. What chapters or phrases should I be looking for to do these problems? These are study guide questions... and I need to learn how to do them soon... I'm so lost in my Chem class..

 

[Grogerian]

You should have a table reffering to insoluble substances in H2O i assume, i do... :/ like PbI is insoluble(if i remember correctly, i don't have the table in front of me) there are also a set of 5 rules...

as for net ionic equations, look in the "Redox Reduction Reactions" Should be in there, or check the glossary section of your textbook, I'm not very good at them ^.^

 

[Borek]

You should have a table reffering to insoluble substances in H2O i assume, i do... :/ like PbI is insoluble(if i remember correctly, i don't have the table in front of me) there are also a set of 5 rules...

OK for tables, they should be in the book or easy to google, but no such thing as PbI (PbI₂ it is).

as for net ionic equations, look in the "Redox Reduction Reactions" Should be in there, or check the glossary section of your textbook, I'm not very good at them ^.^

Net ionic equations have nothing in common with redox reactions. Net ionic means just that they contain only ions that take part in the reaction (none of the spectators).