Hey! I tried doing problems 7-10 and i keep getting the wrong answer. Can you pl

Question

Hey! I tried doing problems 7-10 and i keep getting the wrong answer. Can you please show me how you got your answer so I can learn where I messed up. Thank you and please do them all (:
QUESTION 7 1 points Save Answer Balance the following redox equation in acid. In the blank put the species does not appear on that side of the equation.) 1-(aq) PbO2 (s) Pb2+(aq) H+(aq) H2000 12(s) QUESTION 8 1 points Save Answer Balance the following redox equation in acid. In the blank put the correct stochiometric coefficient (0, 1,2, etc. (Note: 0 if the species does not appear on that side of the equation.) MnO4-(aq) SO3 (aq) SO4 (aq) H (aq) 2+ 0H2000 Mn (aq) QUESTION 9 1 points Save Answer Balance the following redox equation in base In the blank put species does not appear on that side of the equation.) nMno4-(aa) Br (aq) MnO2(s) HO (aq) Bro3 (aq) QUESTION 10 1 points Save Answer Balance the following redox equation in base. In the blank put the correct stochiometric coefficient (0, 1, 2, etc). (Note: 0 if the species does not appear on that side of the equation.) H202(aq) CIO2(aq) O2 (g) HO-(aq) 0H2000 CIO2 (aq)

Explanation / Answer

Q7

PbO2 + I- + H+ --> Pb+2 + I2 + H2O

ignore H+ and H2O for now,

split in half cells

PbO2 = Pb+2

I- = I2

balance atoms other than O

PbO2 = Pb+2

2I- = I2

balance O adding H2O

PbO2 = Pb+2 + 2H2O

2I- = I2

balance H adding H+

4H+ + PbO2 = Pb+2 + 2H2O

2I- = I2

balance charges

2e- + 4H+ + PbO2 = Pb+2 + 2H2O

2I- = I2 + 2e-

add all

2I- + 2e- + 4H+ + PbO2 = Pb+2 + 2H2O +  I2 + 2e-

cancel common terms

2I- + 4H+ + PbO2 = Pb+2 + 2H2O +  I2

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