Question

oxidation numbers of:
2KOH + K2Cr2O7 --> 2k2CrO4 + H2O

AgNO3 + KI --> AgI + KNO3

2PbS + 3O2 --> 2PbO + 2SO2

Answer 1

@JoannaBlackwelder how do I do this?

Answer 2

Do you have a lost of the rules?

Answer 3

* list :)

Answer 4

no I don't... I know that any one element is 0

Answer 5

Good! The sum of compounds adds up to the charge on the compound as well. Here is a link to a list of the rules. http://www.chemguide.co.uk/inorganic/redox/oxidnstates.html

Answer 6

I'm not really sure I get it... can we do the first one @JoannaBlackwelder