REDOC

Question 1

What type of elements always retain the same ON?

Answer 1

Very electro positive and negative elements like F O and N for electronegative and Grp 1, 2, Al and hydrogen

Question 2

What is a disproportionation reaction?

Answer 2

A reaction where one substance acts as both the OA and RA

Question 3

Steps to calculate specific ON instead of average?

Answer 3

1. Count the number of free electrons
2. For every bond, both electrons is assigned to the more electronegative element
3. Add the number of electrons from step 1 and 2
4. Subtract this number from the original number of valence to find ON

Question 4

What are the 5 main redox half equations?

Answer 4

Cr2O7- —-> Cr3+
MnO4 —-> Mn2+ (in acidic medium) or MnO2 (in neutral or alkaline sol)
H2O2 —-> H+ (acts as RA) or H20 (when it acts as OR)

Question 5

What are the steps to balancing redox equations?

Answer 5

1. Make sure that there are the same number of atoms on each side
2. Add H2O in order to balance the number of O
3. Add H+ to balance number of H
4. Add electrons to balance charge on both side
5. Multiply 2 redox half eqns to make an overall eqn
6. Eliminate any common terms
7. Add OH- on both sides of the equation to neutralise the H+ and combine to form H2O ( alkaline and neutral medium)