ch. 7, 8, & 18  chemical reactions                    test                          60 points                               chemistry

1. Fill-in the below blanks with the lowest ratio of integers to ‘balance’ the chemical equations.  [12 points]

a.  ____  CH3OH  +  _____ O2  →   _____  CO2  +  _____ H2O

b.  ____  Ca(NO3)2  +   _____  Li3PO4   →   ____ LiNO3   +   _____ Ca3(PO4)2

c.  _____  sodium hydroxide  +   ____  hydrogen sulfate  →    ______  water   +   _____  sodium sulfate

2. Write the net ionic equation for ___;  need not ‘balance’ the chemical equation, but write the correct chemical formula; i.e. ‘balance’ the charges, when writing a chemical formula.  If there is no ‘net ionic equation, then write ‘no reaction’.  [15 points]

a. Mix aqueous solutions of hydrogen chloride  +  potassium hydroxide

b. Mix aqueous solutions of lithium carbonate  +  hydrogen bromide

c. The combustion of ethane, C2H6, in air

d.  Mix aqueous solutions of barium chloride  + sodium phosphate

e. Add solid copper into an aqueous solution of zinc nitrate

3.  Fill-in the blank:  identify the type(s) of reactions.  [10 points]

a. CH3OH  +  O2  → CO2  +  H2O  is an example of  _____________________________

b. Ca(NO3)2  +   Li3PO4   →  LiNO3   +   Ca3(PO4)2   is an example of  _____________________________

c. sodium hydroxide  +   hydrogen sulfate  →   water   +   sodium sulfate    is an example of ______________________

d. Mix aqueous solutions of barium chloride  + sodium phosphate   is an example of  ____________________________

e. Add solid copper into an aqueous solution of zinc nitrate  is an example of  _____________________________

4. What is the oxidation number in each ‘atom’ in ___.  [11 points]

a. K2Cr2O7

b. Sodium carbonate

c. Carbon tetrachloride

d. FeSO4

5.  Fill-in the below blanks; identify the atom and molecule.   [12 points]

a.  H2O2  →  H2O  +  O2

___________________  is oxidized, where the oxidation number changes from  _____   to   _____

 ___________________  is reduced where the oxidation number changes from  _____   to   _____

b.  CH4  +  O2  →  CO2  +  H2O

___________________  is oxidized, where the oxidation number changes from  _____   to   _____

 ___________________  is reduced where the oxidation number changes from  _____   to   _____