Question

1. Writing and Balancing Equations. Write the balanced chemical reaction for each of the following. On the line, identify the kind of reaction. Your choices are: Combination, Combustion, Decomposition, Neutralization, Oxidation/Reduction, Precipitation.

___________________ a) Mg(s) combines with nitrogen gas.

___________________ b) When solid potassium chlorate is heated, it decomposes to form solid potassium chloride and oxygen gas.

___________________ c) The complete combustion of acetone, C3H6O(l), a compound used as fingernail polish remover.

___________________ d) Write the balanced MOLECULAR… include the states of products, the balanced IONIC… circle spectator ions, and the balanced NET-IONIC Reactions. Molecular: CaCl2(aq) + Na2CO3(aq) --->

Ionic:

Net Ionic:

___________________ e) Write the balanced MOLECULAR… label the acid as strong or weak…. label the base as strong or weak, the balanced IONIC… circle spectator ions, and the balanced NET-IONIC Reactions.

Molecular: CH3COOH(aq) + Ba(OH)2(aq) --->

Ionic:

Net Ionic:

___________________ f) The reaction that occurs between FeSO4(aq) and Mg(s). What element is oxidized? What element is reduced? What is the oxidation number of the S in FeSO4? Be sure your work supports your answers.

g) Separate samples of a solution of an unknown ionic compound are treated with dilute AgNO3, Pb(NO3)2, and BaCl2. Precipitates form in all three cases. Which of the following could be the anion of the unknown salt: Br1- , CO3 2- , NO3 1- ? Explain. Include the reactions that support your answer.

PLEASE be as descriptive when necessary it is very much appreciated

Answer 1

1. 3Mg(s) + N2(g) --> Mg3N2(g)
2. 2KClO3(s) + heat --> 2KCl(s) + 3O2(g)
3. C3H6O(l) + 4O2(g) ---> 3CO2(g) + 3H2O(g)
4. Ca+2(aq) + 2Cl-(aq) + 2Na+(aq) + CO3-2(aq) -->
   CaCO3(s) + 2Na+(aq) + 2Cl-(aq)
   
   so the net ionic equation becomes:
   
   Ca+2(aq) + CO3-2(aq) --> CaCO3(s)
5. Molecular equation: Make sure it is properly balanced. You have not done this:
   3 Ba(OH)2(aq) + 2 H3PO4(aq) = Ba3(PO4)2(s) + 6 H2O(l)
   
   full ionic equation:
   3Ba 2+ (aq) + 6OH-(aq) + 6H-(aq) + 2PO4 3-(aq) → Ba3(PO4)2(s) + 6H2O(l)
   
   Now, the rules of changing the full ionic equation into a net ionic equation is to cancel out anything that is common to both sides of the full ionic equation. There is nothing to cancel. Therefore:
   
   Net ionic equation:
   3Ba 2+ (aq) + 6OH-(aq) + 6H-(aq) + 2PO4 3-(aq) → Ba3(PO4)2(s) + 6H2O(l)