1.
2.
Determine the oxidation states of each element in the compounds below:
KBrO3
HCHO
H2O2
Na2C2O4
HCO3–
a)
b)
c)
d)
e)
Al2(SO4)3(aq) +
MnO4–
Al(NH3)63+
3H2(g)
aluminum
hydrogen
sulfur
oxygen
none of these; this is not a redox reaction
What is the oxidizing agent in the reaction below?
3C3H8O + 2CrO3 + 3H2SO4
a)
b)
c)
d)
e)
4.
OF2
Which element is reduced in the following reaction?
2Al(s) + 3H2SO4(aq)
3.
BrF3
Cr2(SO4)3 + 3C3H6O + 6H2O
C3H8O
CrO3
H2SO4
Cr2(SO4)3
C3H6O
Which of the following reactions does not involve oxidation-reduction?
a)
b)
c)
d)
e)
CH4 + 3O2
2H2O + CO2
Zn + 2HCl
ZnCl2 + H2
2Na + 2H2O
2NaOH + H2
2Al(NO3)3 + 3Ba(OH)2
2Al(OH)3 + 3Ba(NO3)2
All are oxidation-reduction reactions.
5.
Which of the species below cannot function as an oxidizing agent?
a) S(s)
b) NO3–(aq)
c) Cr2O72–(aq)
d) I–(aq)
e) MnO4–(aq)
6.
Balance the reaction below, which occurs in acidic solution. When this equation is balanced using the smallest whole-number
coefficients, what is the coefficient on H2O, and on which side of the equation does H2O appear?
H2S + BrO3–
a)
b)
c)
d)
e)
3, on the product side
6, on the product side
9, on the product side
4, on the reactant side
5, on the reactant side
S + Br2
7.
Balance the following redox reaction which occurs in acidic solution. When this equation is properly balanced, using the
smallest whole-number coefficients, what is the coefficient on water, and on which side of the equation does water appear?
MnO4–(aq) + Cl–(aq)
a)
b)
c)
d)
e)
8.
unbalanced
4, on the product side
8 on the product side
20 on the product side
4 on the reactant side
6 on the reactant side
Balance the following redox reaction which occurs in basic solution. When this equation is properly balanced, using the
smallest whole-number coefficients, what is the coefficient on water, and on which side of the equation does water appear?
Cr(OH)3(s)
a)
b)
c)
d)
e)
9.
Mn2+(aq) + Cl2(g)
+
ClO–(aq)
CrO42–(aq)
+ Cl2(g)
1, on the product side
3, on the product side
2, on the reactant side
2, on the product side
4, on the product side
Balance the reaction below, which occurs in basic solution. When this equation is balanced using the smallest whole-number
coefficients, what is the coefficient on H2O, and on which side of the equation does H2O appear?
NO3–(aq) + SO32–(aq)
a)
b)
c)
d)
e)
1, on the reactant side
1, on the product side
3, on the product side
6, on the product side
6, on the reactant side
NO(g) + SO42–(aq)