Oxidation and Reduction (REDOX)

• What are redox reactions?

  Reactions where oxidation and reduction occur simultaneously
• What are the key components covered in redox reactions?

  • Displacement reactions
  • Ionic equations
  • Half equations
• What does oxidation mean in terms of oxygen?

  Gaining of oxygen
• What does reduction mean in terms of oxygen?

  Loss of oxygen
• If aluminum reacts with oxygen to form aluminum oxide, what happens to aluminum?

  It is oxidized
• What mnemonic helps remember oxidation and reduction in terms of electrons?

  Oil rig
• What does "oil rig" stand for?

  Oxidation is loss, reduction is gain
• What happens to a magnesium atom when it loses two electrons?

  It becomes a two plus ion
• Why do oxidation and reduction reactions usually occur together?

  One substance loses electrons while another gains
• What are redox reactions also known as?

  Reduction oxidation reactions
• What happens when magnesium reacts with dilute acid?

  Magnesium loses electrons and is oxidized
• What do hydrogen ions become when they gain electrons?

  Neutral hydrogen atoms
• What is a displacement reaction?

  A more reactive metal displaces a less reactive one
• In the reactivity series, which metal is more reactive: calcium or iron?

  Calcium
• What happens when calcium is added to iron sulfate?

  Calcium displaces iron to form calcium sulfate
• What are spectator ions?

  Ions that do not change during the reaction
• How do you write an ionic equation?

  Show only particles that change in the reaction
• What is the purpose of half equations?

  To show gain and loss of electrons
• How do you balance charges in half equations?

  Add electrons to make charges equal
• What should you check in half equations?

  Overall charge on each side balances
• What is the charge on the left side of the iron half equation?

  Two plus charge
• What happens if the overall charges in half equations don't match?

  Electrons are likely on the wrong side
• What should you do if charges don't balance in half equations?

  Check the placement of electrons