Oxidation, Reduction and Redox Equations

• What is the focus of this AQA revision video?

  Oxidation reduction and Redux reactions
• What acronym helps to remember oxidation and reduction?

  Oil rig
• What does oxidation refer to in terms of electrons?

  Loss of electrons
• What does reduction refer to in terms of electrons?

  Gain of electrons
• What happens to calcium when it burns in oxygen?

  Calcium is oxidized by losing electrons
• What is formed when calcium reacts with oxygen?

  Calcium oxide (CaO)
• What charge does calcium have when it forms Ca2+?

  +2 charge
• What is the role of oxygen in the reaction with calcium?

  Oxygen is reduced by gaining electrons
• What is a reducing agent?

  A substance that loses electrons
• How does a reducing agent behave in a reaction?

  It oxidizes itself by losing electrons
• What is an oxidizing agent?

  A substance that gains electrons
• How does an oxidizing agent behave in a reaction?

  It reduces itself by gaining electrons
• What is the oxidation number of uncombined elements?

  Always zero
• What is the oxidation number of H ions?

  Same as the charge on the ion
• What is the oxidation number of group one elements?

  Always +1
• What is the oxidation number of group two elements?

  Always +2
• What is the oxidation number of aluminium?

  Always +3
• What is the oxidation number of hydrogen in most compounds?

  Always +1
• When is hydrogen's oxidation number -1?

  In hydrides bonded to metals
• What is the oxidation number of chlorine when bonded with fluorine?

  Positive value
• What is the oxidation number of fluorine?

  Always -1
• What is the oxidation number of oxygen in most compounds?

  -2
• What is the oxidation number of oxygen in O2?

  +2
• What is the oxidation number of oxygen in peroxides?

  -1
• How do you determine oxidation states in compounds?

  By applying a set of rules
• What is the oxidation state of nitrogen in H3N?

  -3
• What is the oxidation state of sulfur in H2S?

  -2
• What is the oxidation state of oxygen in H2O2?

  -1
• What is the oxidation state of sulfur in SO4^2-?

  +6
• What is the oxidation state of iron in Fe2O3?

  +3
• What is the oxidation state of iron in FeO?

  +2
• What is the oxidation state of vanadium in V2O5?

  +5
• What is the significance of Roman numerals in oxidation states?

  They indicate the oxidation state of elements
• What is the oxidation state of copper in Cu2O?

  +1
• What is the oxidation state of vanadium in V2O3?

  +3
• What is a characteristic of transition metals regarding oxidation states?

  They have variable oxidation states
• What is the oxidation state of copper in CuO?

  +2
• What is the oxidation state of vanadium in V2O4?

  +4
• What is the oxidation state of iron in Fe3O4?

  +8/3
• What is the oxidation state of iron in iron(III) oxide?


  +3