Redox

Question 1

What is an oxidation state

Answer 1

The charge on an ion/atom

Question 2

What is the overall oxidation state of neutral compounds

Answer 2

0

Question 3

What is the oxidation state of elements

Answer 3

0

Question 4

What is the exception for the oxidation state of H

Answer 4

Generally, H is +1
For metal hydrides (e.g. NaH) the oxidation state is -1

Question 5

What is the exception for the oxidation state of oxygen

Answer 5

Generally, Oxygens oxidation state is -2
Exceptions:
Peroxides: -1
With F2O: +2

Question 6

What is the exception for the oxidation state of Cl

Answer 6

Generally, oxidation state -1
Exception:
With O or F it varies

Question 7

Generally, the oxidation state of a specific element in a compound is equivalent to what?

Answer 7

The group it is in

Question 8

What is a reducing agent

Answer 8

An electron donor

Question 9

What is an oxidising agent

Answer 9

An electron acceptor

Question 10

Write the 4 steps to balancing a half equation

Answer 10

1 - Balance elements that aren’t oxygen or hydrogen
2 - Balance oxygens using water
3 - Balance hydrogens using H+
4 - Balance charges using e-

Question 11

What do we need to ensure when combining half equations

Answer 11

That the charge is the same on both sides (by multiplying an equation)

Question 12

What cancels out when combining half equations

Answer 12

Electrons

Question 13

What is a disproportionation reaction

Answer 13

A reaction where the same species is simultaneously oxidised and reduced