Topscore help with redox

[woox]

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#52 Test 1:
PbO + CO -> Pb + CO2

What is oxidizing agent?

The answer is PbO, but I dont understand why? PbO on the left side has both charges of 0/0 and Pb on the right side has a charge of +4?

So 0 - +4 isn't oxidizing?

 

[mh0000]

#52 Test 1:
PbO + CO -> Pb + CO2

What is oxidizing agent?

The answer is PbO, but I dont understand why? PbO on the left side has both charges of 0/0 and Pb on the right side has a charge of +4?

So 0 - +4 isn't oxidizing?

In PbO, O has an oxidation state of -2, therefore Pb must have an oxidation state of +2 in order for PbO to be neutral. Pb(s) will have an oxidation state of 0 because it is in its elemental form. Therefore, Pb went from +2 -> 0, meaning it gained electrons and was reduced. It also means that PbO is the oxidizing reagent.

 

[AlbinoPolarBear]

#52 Test 1:
PbO + CO -> Pb + CO2

What is oxidizing agent?

The answer is PbO, but I dont understand why? PbO on the left side has both charges of 0/0 and Pb on the right side has a charge of +4?

So 0 - +4 isn't oxidizing?

Oxidizing agent gets reduced.

You can understand this reaction by 2 half reactions:
1) PbO -> Pb
2) CO -> CO2

Get the oxidation number of Pb in 1)
Left side: PbO, Since we know O is usually -2, Pb must be +2
Right side: Pb = 0, since there are no charges.

Therefore, if you just look at Pb, you go from +2 -> 0.
It gains electrons, therefore it's being reduced.

Again, oxidizing agent gets reduced, therefore, it's PbO.

We can do the same for CO -> CO2, in which C goes from +2 to +4 (oxidation, reducing agent).

 

[rockclock]

#52 Test 1:
PbO + CO -> Pb + CO2

What is oxidizing agent?

The answer is PbO, but I dont understand why? PbO on the left side has both charges of 0/0 and Pb on the right side has a charge of +4?

So 0 - +4 isn't oxidizing?

Your oxidation states are all off:

Pb: +2 to 0 ...reduced (oxidizing agent)
O: -2 to -2
C: +2 to +4 ...oxidized (reducing agent)

Pb is the element that is reduced, but technically the entire reactant, PbO, is the oxidizing agent.

...basically what mh and albino just said.

 

[woox]

So in elemental form there will be 0 charge?

 

[AlbinoPolarBear]

So in elemental form there will be 0 charge?

YEHHHHHH. If the element is neutral!