Hello there! I was wondering if you could check my answers for me? I was having trouble and I finally understand.

Question

1. Indicate the oxidation number of carbon and sulfur in the following compounds.
A) CO= +2
C) Na2CO3= +4
E) CH4= -4
G) SO2= +4
I) Na2SO4= +6
K) Na2S303= +2
M) SCl2= +2
O) SOCl2= +4

2.) Indicate the oxidation number of phosphorous, iodine, nitrogen, tellurium, and silicon.

b) PO3^3-= +3
d) P3O10^5-= +5
f) IO2^-= +3
h) NH4^+= -3
j) NO2^-= +3
l) NO2^+= +5
N) TeO4^2-= +6

3.) Indicate the oxidation number of the metallic elements in the following compounds.

a) Fe2O3= +3
c) CoS= +2
e) K3CoCl6= +3
G) CrO3= +6
I) K2Cr2O7= +6
K) K2MnO4= +6
M) MnO2= +4
O) Pb04= +8

Thank you so much! I have a quiz tomorrow and I want to make sure I am practicing everything correctly.

Answer 1

1. Indicate the oxidation number of carbon and sulfur in the following compounds.
A) CO= +2
C) Na2CO3= +4
E) CH4= -4
G) SO2= +4
I) Na2SO4= +6
K) Na2S303= +2 OK if that is Na2S2O3
M) SCl2= +2
O) SOCl2= +4

2.) Indicate the oxidation number of phosphorous, iodine, nitrogen, tellurium, and silicon.

b) PO3^3-= +3
d) P3O10^5-= +5
f) IO2^-= +3
h) NH4^+= -3
j) NO2^-= +3
l) NO2^+= +5
N) TeO4^2-= +6

3.) Indicate the oxidation number of the metallic elements in the following compounds.

a) Fe2O3= +3
c) CoS= +2
e) K3CoCl6= +3
G) CrO3= +6
I) K2Cr2O7= +6 yes, for each Cr
K) K2MnO4= +6
M) MnO2= +4
O) Pb04= +8 OK if you meant this but I've never heard of PbO4. You may have meant (PbO4)^2-
They look ok to me except for those notes I made.

Answer 2

i meant Pb304…sorry, my mistake

Answer 3

For Pb3O4, Pb is overall a 8/3 for each Pb. You can read about how this happens here. Pb3O4 is a mixture.

https://answers.yahoo.com/question/index?qid=20130525034348AA6MFHx