redox reactions

What are redox reactions

Reactions in which oxidation and reduction both take place at the same time

What is oxidation

-oxidation - The loss of electrons

-reduction- the gain of electrons

What is a half equations and give example of symbol equation using hydrogen

A half equation is an equation that shows the gain or loss of electronsof a single element in a reaction.

Hydrogen ions gain electrons so are reduced

2H+. +. 2e- —> H

What is the half equation for the oxidation of magnesium?

Mg ➔ Mg²⁺ + 2e^-

What type of reaction is a displacement reaction

Displacement reactions are a type of redox reaction. In displacement reactions. It’s always the metal ion that gain electrons and is reduced, the metal atom always loses electrons and is oxidised.

Extra note

Redox reactions don’t happen by themselves both take place at the same time.

If one substance loses electrons, another substance has to gain electrons and bc they happen together we call them redox reactions

What do we call ions that aren't involved in a chemical reaction?

Spectator ions

Turn displacement reaction of calcium and iron sulphate into ionic equation and half equations

Ca + FeSO4 —> CaSO4 + Fe ==displacement reaction

Ca + Fe2+SO42- —> Ca2+SO42- + Fe

Can get rid of sulphate as it’s a spectator ion

Ca + Fe2+ —> Ca2+ + Fe

Ca —> Ca2+ + 2e-

Fe2+ + 2e- —> Fe

What do ionic reactions only show

Only show the particles that react and the products they form

Ionic equations for redox reactions only concentrate on the substances which are oxidised or reduced