1. What is the oxidation number of __.  [10 points]

a.  Mn in KMnO4 is  ______

b.  Sulfur in the sulfate ion is ____

c.  C in CH3OH is ___

d.  Nitrogen in nitrogen gas is  ____

e.  Nitrogen in barium nitrate is  ____

2. Identify the atom (in the molecule) that are involved in oxidation and reduction (in the both the reactant and product) in the following redox reactions; include the oxidation number near the atom that is oxidized or reduced.  [12 points]

a.  CH3OH   +   O2   →   CO2   +   H2O

Oxidized:  _______________________

Reduced:  _______________________

b. Zn  +  H +  →  H2O  +  Mn 2+  +  Zn 2+

Oxidized:  _______________________

Reduced:  _______________________

 

3. Write the net ionic equation for the following reactants; if there is no reaction, then write “no reaction”.  [6 points]

a. add solid zinc into an aqueous solution of hydrogen chloride

b. the combustion of CH4

4. Identify the type(s) of reactions using the below list of possible reactions.   [6 points]

single replacement reaction                  decomposition reaction
combustion reaction                            redox reaction
synthesis reaction


a. C6H12O6  +  O2  →  CO2  +  H2O is  ______________________________

b.  Cu  +  HNO3  →  Cu(NO3)2  +  NO2  +  H2O is  _____________________

c.  Zn  +  HBr  →  ZnBr2  +  H2  is  _________________________________

5.  In regards to the reaction:     Zn  +  H +  →  H2O  +  Mn 2+  +  Zn 2+   [6 point]

6. Describe an experimental protocol, based on solubility rules, to differentiate between an aqueous solution of __; include an interpretation of your observations.  That is, add ___, where there’s a precipitate in one case and no precipitate in the other case.   Choices to fill-in the 2nd blank:  NaOH, Na3PO4, Na2CO3, NaI, Na2SO4, AgNO3, Pb(NO3)2, Co(NO3)2, Cu(NO3)2, Ba(NO3)2, Fe(NO3)2, Mg(NO3)2; there may be more than one correct answer to fill-in the 2nd blank.  [20 points]

a. Sodium sulfate versus sodium sulfide

b.  Magnesium nitrate versus barium nitrate