C23 Redox And Electrode Potentials

Question 1

What’s an oxidising agent

Answer 1

Electron acceptor

A species that’s reduced in a reaction and causes another species to be oxidised

Question 2

What’s a reducing agent

Answer 2

Electron donor

A species that’s oxidised in a reaction & causes another species to be reduced

Question 3

Define oxidation

Answer 3

Loss of electrons

An increase in oxidation number

Question 4

Define reduction

Answer 4

Gain of electrons

Decrease in oxidation number

Question 5

What happens in a redox reaction

Answer 5

Electrons transferred from 1 species to another

1 element is oxidised whilst other is reduced

Question 6

Why’s 2CrO4^2- + 2H+ —> Cr2O7^2- + H2O not a redox reaction

Answer 6

Chromium is oxidised whereas hydrogen remains the same oxidation state (no element is reduced)