Wow! Seven problems in 2 minutes!! You must be taking a test or something.
You have posted your assigned problems, which no one here will do for you.
If you have a question, please ask it. If not, work on completing the assignment and then post what YOU THINK if you'd like someone here to critique your thinking and writing.
Using the half-reaction method, balance the redox reaction below. Show your work; partial credit will be given.
I- + Br2 → IO3- + Br-
Write the reduction and oxidation half-reactions. Balance them for atoms. Balance each of the half-reactions for charge. Multiply the half-reactions by factors that make the total charge transfer equal. Add the half-reactions, canceling electrons and species.
2 answers
http://www.chemteam.info/Redox/Redox.html