Chemistry

Name: _________________________ ELECTROCHEMISTRY WORKSHEET #2

1.

2.

Assign oxidation numbers to the following: a. CO32-

b.

K2SO4

c. P4O10

d.

NH4+

e. Na2Cr2O7

f.

Cr2O72-

State the oxidation number for each of the following: a. S in SO2 b. Se in SeO32c. S in K2S d. Cl in Ba(ClO3)2 e. N in NO2f. Cr in Cr2O72-

3.

Determine whether each of the following reactions represent redox reactions. For those that are redox, identify the species that is oxidized and the species that is reduced. Give a reason in each case. a. N2 + H2  NH3

b. H+ + OH-  H2O

c. Cu + HNO3  Cu(NO3)2 + NO2 + H2O

d. KOH + HBr  KBr + H2O

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