1. MnO4-(aq) + I-(aq) → MnO2(aq) + IO3-(aq)
Balance the reaction that occurs in a basic environment:
MnO4-(aq) + I-(aq) → MnO2(aq) IO3-(aq) +7 -1 +4 +5
3e- +
4H+(aq)+
MnO4-(aq) → MnO2(aq)
+ 2H2O(l) 2
3H2O(l) +
I-(aq) → IO3-(aq)
+ 6H+(aq)
+ 6e-
2OH-(aq) +
2H2O(l)
2H+(aq)
H2O(l)
+ 2MnO4-(aq)
+ I-(aq) →
2MnO2(aq)
2MnO2(aq)
+ H2O(l)
+ IO3-(aq)
+ 2OH-(aq)

2. Al(s) + H2O(l) → Al(OH)4-(aq) + H2 (g)
Balance the reaction that occurs in a basic environment:
Al(s) + H2O(l) → Al(OH)4-(aq) H2 (g)
Once this is balanced (alphabetically on each side by name of the first element if it’s a compound or polyatomic ion), you will be able to use the coefficients to describe a combination to a safe where bonus points are kept. Once you know the combination, write it down like this: X – XX – XX
on the back of an index card that I will give you (with your work on the front) and bring it me. You have one chance to unlock the lock!

3. Combination to the safe: 2-62-23
Balance the reaction that occurs in a basic environment:
Al(s) + H2O(l) → Al(OH)4-(aq) H2 (g)
2 [ 4H2O + Al → Al(OH) H e- ]
3 [ 2e H+ + H2O → H H2O ]
_______________________________________
8H2O + 2Al → 2Al(OH) H2 +2H+
2Al + 6H2O + 2OH- → 2Al(OH) H2
Combination to the safe:
(acidic)
(basic)