### How to Tell if A Substance is Oxidised or Reduced?

This post will go through oxidation states for QCE Chemistry.

**3.2.1 – Redox Reactions**

*Deduce the oxidation state of an atom in an ion or compound and name*

transitional metal compounds from a given formula by applying oxidation

numbers represented as roman numerals*Use appropriate representations, including half-equations and oxidation*

numbers, to communicate conceptual understanding, solve problems and

make predictions.*Understand that oxidation can be modelled as the loss of electrons from a*

*chemical species, and reduction can be modelled as the gain of electrons by*

*a chemical species; these processes can be represented using balanced*

*half-equations and redox equations (acidic conditions only)*

### Calculating the Oxidation Number

This video will go through oxidation numbers and the way to calculate them

### Redox Equations in Acidic Solution

This video will go through how you balance redox equations in acidic solutions.