Homework Help: 10th grade

Posted by Michael on Sunday, February 8, 2009 at 8:24pm.

Assign oxidation numbers to each atom in the following compounds: HI, PBr3, GeS2, KH, As2O5, H3PO4 (the numbers should be subscripts)

Science (chem?), not "10th grade" - Writeacher, Sunday, February 8, 2009 at 8:34pm
assistance needed
10th grade - bobpursley, Sunday, February 8, 2009 at 9:12pm
Do you have the seven rules?

I will go over one ..
H3PO4
Rule: H is +1
Rule: O is -2 except in peroxides.
Rule: The sum of the oxidation numbers in a compound is zero.
3+ P -8=0 which makes P + 5

Try some yourself, memorize the rules. We will check your work.
10th grade - Michael, Sunday, February 8, 2009 at 9:28pm
but like i dont understand what the answer is supposed to look like for these problems
10th grade - Michael, Sunday, February 8, 2009 at 9:29pm
and yeah its 10th grade chemistry
10th grade - Dr Russ, Monday, February 9, 2009 at 10:34am
The answer will be a number for each atom with an associated sign. SO +1, -2 etc.

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