Some chemistry problems I don't know where to start

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SUMMARY

This discussion focuses on solving chemistry problems related to insoluble compounds and net ionic equations. Participants address specific examples, such as identifying insoluble compounds like PbBr2 and PbCO3, and writing balanced net ionic equations for reactions involving CaCO3 and redox reactions. Key concepts include the importance of referencing tables for insoluble substances and understanding the distinction between net ionic equations and redox reactions. Participants emphasize the need for study materials, particularly chapters on solubility rules and redox reactions, to aid in problem-solving.

PREREQUISITES
  • Understanding of solubility rules in aqueous solutions
  • Knowledge of net ionic equations and their formulation
  • Familiarity with redox reactions and oxidation states
  • Access to a chemistry textbook or reliable online resources for reference tables
NEXT STEPS
  • Review solubility rules for common ionic compounds in water
  • Study the process of writing net ionic equations, focusing on spectator ions
  • Learn about redox reactions and how to identify oxidation and reduction processes
  • Consult chemistry textbooks for chapters on precipitation reactions and redox reactions
USEFUL FOR

Students struggling with chemistry concepts, particularly those in introductory chemistry courses, as well as educators seeking to clarify the teaching of solubility and redox reactions.

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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..
 
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You should have a table referring 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 ^.^
 
Grogerian said:
You should have a table referring 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).
 

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