REDOX

• Oxidation State

  How many electrons does an atom gain or lose to become a neutral atom.
• In a neutral compound, what does adding all ox. states equal?

  Zero
• In an ion, what does adding all ox. states equal?

  The charge of the ion
• What is the ox. states equal of an element?

  Zero
• What is the ox. state of group 1?

  +1
• What is the ox. state of F?

  -1
• What is the ox. state of H with a metal?

  -1
• What is the ox. state of H with a non-metal?

  +1
• What is the ox. state of O?

  -2
• When is the ox. state of O not -2?

  When bonding to F or in a peroxide
• What is the ox. state of Cl?

  -1
• When is the ox. state of Cl not -1?

  When bonding to F or O
• Oxidation

  loss of electrons
• Reduction

  gain of electrons
• REDOX

  oxidation and reduction happen simultaneously
• What side of the equation are the electrons for a reduction?

  left
• What side of the equation are the electrons for an oxidation?

  right
• When do you add H20 to a half equation?

  In acidic aqueous conditions
• Why do you add H20 to a half equation?

  To balance the number of atoms of O
• Why do you add H+ to a half equation?

  To balance the number of H atoms and the charges
• Oxidising agent

  Oxidises another species, gets reduced
• Reducing Agent

  Reduces another species, gets oxidised
• Disproportionation

  Same element gets reduced and oxidised in a reaction