Chemistry AQA AS Unit 2 Redox Reactions

Made these notes for my year 12 summer exam to revise and read over. There are spelling mistakes in most of my files but due to the busy exam schedule I had no time to correct them (sorry).

Most files have more information than what is needed but I feel it helps you feel more confident walking into the exam if you have a greater knowledge background and may help when having to apply knowledge to questions. Good luck :)

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  • Created by: Chelcie
  • Created on: 02-09-13 13:37
Preview of Chemistry AQA AS Unit 2 Redox Reactions

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Redox Reactions
Redox is short for reduction-oxidation. It is the transferring of electrons from one species to another.
OXIDATION: A reaction where an atom or a group of atoms lose electrons.
OXIDISING AGENT: A reagent that oxidises (removes electrons from) another species.
REDUCTION: A reaction in which an atom or group of atoms gain electrons.
REDUCING AGENT: A reagent that reduces (adds electrons to) another species.
OXIDATION STATES: The number of electrons lost or gained from by an atom in a compound
compared to the uncombined atom.
HALF EQUATION: An equation which considers just one of the species involved and shows the
electrons transferred to or from it.
DISPROPORTIONATION: Where one atom is both oxidised and reduced. (Normally group 7)
SPECTATOR ION: Ions that are unchanged during a chemical reaction (take no part in it).
Oxidation
Is
Loss
Reduction
Is
Gain
Balancing equations must be balanced for atoms and charge.

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To work out half equations, you need to know the elements that have been oxidised and
reduced.
ATOM OXIDATION STATE
Elements 0
Metal ions (group 1, 2, 3) Ionic state +1, +2, +3
Hydrogen ions +1 (metal hydrides -1)
Fluoride ions -1
Oxygen ions -2 (except F and peroxides, -1)
Chloride ions -1 (except F or O
4 Point Rule
1. Balance for atoms other than O and H
2. Balance for O using HO
3. Balance for H using H
4.…read more

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