1.7 Redox

Question 1

Oxidation is…

Answer 1

the loss of electrons

Question 2

Reduction is…

Answer 2

the gain of electron

Question 3

An oxidising agent

Answer 3

brings about oxidation

by itself being reduced and gaining electrons.

Question 4

A reducing agent

Answer 4

brings about reduction

by itself being oxidised and losing electrons

Question 5

The sum of oxidising states in a compound must

Answer 5

add up to 0

unless it has an overall charge

Question 6

What is an oxidation number?

Answer 6

The number of electrons required to make it neutral ie) Na= 0, Na+ = +1, Cl- = -1

Question 7

How do you find an ionic half equation?

Answer 7

Balance main element,
Balance Oxygen in form of water,
Balance H+ ions
Add electrons to balance the overall charge

Question 8

How do you form a redox equation?

Answer 8

Form two iconic half equations
Multiply up so they both have the same number of electrons
Combine and cancel out electrons (and occasionally, multiple species)