Oxidation/redox Rxan

Question 1

Laws for oxidation numbers (by priority)

Answer 1

First, neutral compound add to zero and for ion, adds to charge of ion and free elements have no oxidation number (Na, Fe, H2,O2,S8)

Second, fluorine has to always be -1 oxidation

Third, group 1 is +1 and group 2 is +2

Fourth, hydrogen with non metals is +1 else with metals or boron it’s -1

Fifth, Oxygen is -2 except with fluorine or peroxides

Finally, sixth, group 17(7A) = -1, group 16(6A) is -2, group 15 (5A) is -3

Question 2

Do you balance the hydrogens first or the oxygens after balancing the non hydrogen/oxygen elements

Answer 2

Balance the oxygen first with water

Question 3

How balance hydrogen in acidic solution?

Answer 3

Just add H+

Question 4

How balance hydrogen in basic solution?

Answer 4

Say you want 2 hydrogens on the right, put 2 H2O on the right side and 2 OH- on the left