1.7 Redox

• What is oxidation?

  Oxidation is the loss of electrons.
• What is reduction?

  Reduction is the gain of electrons.
• Hydrogen's default oxidation state is +1, what is an exception for the default oxidation state of hydrogen?

  If it is in a metal hydride, it becomes a hydride ion which has an oxidation state of -1.
• Oxygen's default oxidation state is -2, What is an exception for this default oxidation state?

  If oxygen is in a peroxide, it becomes a peroxide ion which has an oxidation state of -1.
• What is the method for writing half equations?

  Every Otter Hates Chemistry:

  ○ Electrons.

  ○ Oxygens.

  ○ Hydrogens.

  ○ Charges.
• What is an oxidising agent

  An oxidising agency accepts electrons, it brings about oxidation and is itself reduced
• What is a reducing agent

  A reducing agent donates electrons and brings about reduction while being oxidised itself.
• What is disproportionation?

  Disproportionation occurs when an element is both oxidised and reduced simultaneously.
• How is this an example of disproportionation? 2H2O2 --> 2H2O + O2

  The H2O2 molecule has undergone both oxidation and reduction simultaneously, oxygen goes from an oxidation state of -1 in H2O2, to -2 in H2O and 0 in O2.