Ch. 7, 8, 18 chemical Reactions                      test     [55 points]                              Chemistry

1.   Balance the following chemical equation using the lowest ratio of integers; inset “1” as appropriate.  [15 points]

a.  ___  C2 H6   +  ____  O2   -->  ____  CO2   +  ____  H2 O

b.  ____  MgCl2   +  ____  K3 PO4   -->   ____  Mg3 (PO4 )2   +  ____  KCl

c.  ____  sodium carbonate  +  _____  hydrogen fluoride  -->  ____  hydrogen carbonate  +  ____  ?

d.  ____  hydrogen peroxide   -->  ____  O2   +  ____  H2 O

 

2.   Identify the type of chemical reaction(s) in question 1, above.  [8 points]

a.  ____________________________

b.  ____________________________

c.  ____________________________

d.  ___________________________

 

3.  What is the oxidation number of  ___.  [6 points]

a.  P in phosphate is  ________

b.  Mn in KMnO4 is  _______

c.  C in CH3 OH is  ________


4.  Write the net ionic equation for  ___.    [12 points]

a.  the combustion of CH4

b.  add zinc metal in an aqueous solution of hydrogen chloride

c.   mix aqueous solutions of potassium bromide and lead (II) nitrate

d.  mix aqueous solutions of sodium bicarbonate and nitric acid

 

5.  Identify the “atom” that is oxidized by drawing a curve above, while the “atom” that is reduced by a curve below the following chemical equations.  Write the oxidation number next to the “atom” that is oxidized or reduced.  [12 points]

a.  Zn  +  K2 Cr2 O7   -->  ZnCr2 O7   +  Cr3+   +  K+

b.  C2 H6   +  O2   -->  CO2   +  H2 O

 

6.  Define oxidation.   [2 points]