Redox Reactions

• 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 one context?

  Gaining of oxygen
• What does reduction mean in one context?

  Loss of oxygen
• How can we determine if a substance has been oxidized or reduced?

  By observing the gain or loss of oxygen
• What mnemonic helps remember oxidation and reduction?

  Oil rig: Oxidation is loss, Reduction is gain
• If a magnesium atom loses two electrons, what happens to it?

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

  One substance loses electrons while another gains
• What is a redox reaction short for?

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

  Magnesium loses electrons and forms magnesium ions
• What do hydrogen ions become when they gain electrons?

  Neutral hydrogen atoms in the form of gas
• What is a displacement reaction?

  A reaction where a more reactive metal displaces a less reactive one
• What happens when calcium is added to iron sulfate?

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

  Ions that do not change during the reaction
• How can we simplify ionic equations?

  By removing spectator ions from the equation
• What is the purpose of writing half equations?

  To show the gain and loss of electrons for each element
• How do you write a half equation for calcium?

  Neutral calcium atom forms calcium two plus ion
• What must be added to balance the charge in the calcium half equation?

  Two electrons on the right side
• How do you write a half equation for iron?

  Iron II plus ion forms neutral iron atom
• How do you ensure charge balance in half equations?

  Check overall charge on each side is equal
• What does it indicate if charges on both sides of a half equation are not equal?

  Electrons are placed on the wrong side
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