redox reactions

• What are redox reactions?

  Reactions in which 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?

  Oxidation is the gaining of oxygen
• What does reduction mean in terms of oxygen?

  Reduction is the loss of oxygen
• What does the mnemonic "oil rig" stand for?

  Oxidation is loss, reduction is gain
• What happens when one substance loses electrons in a redox reaction?

  Another substance must gain those electrons
• What is the definition of a redox reaction?

  Reduction oxidation reactions
• What do hydrogen ions do in the reaction with magnesium and dilute acid?

  They gain electrons and are reduced to hydrogen gas
• What are displacement reactions?

  • Involve a more reactive metal displacing a less reactive one
  • Example: Calcium displacing iron in iron sulfate
• What are spectator ions in a reaction?

  Particles that do not change or take part in the reaction
• How can ionic equations be simplified?

  By removing spectator ions
• What are half equations in redox reactions?

  • Show the gain and loss of electrons for each element
  • Example: Calcium losing electrons to form calcium ions
• How do you balance charges in half equations?

  By adding electrons to the appropriate side
• In the half equation for iron, what happens to the Iron II plus ion?

  It gains two electrons to form an iron atom
• How can you check if the overall charges in a half equation balance?

  By comparing the total charge on each side
• What should you do if the overall charges on each side of a half equation aren't the same?

  Check the placement of electrons