Reactivity series

• What is the chemical formula for rust?

  Hydrated iron oxide
• What two substances must be present in sufficient amounts for iron to rust?

  Oxygen and water
• What are the barrier methods for preventing rusting?

  • Paint
  • Grease
  • Oil
• What type of method is sacrificing to prevent rusting?

  Coating in a more reactive metal
• In a reaction between two substances, what happens if the more reactive substance already has less electrons?

  Nothing will change
• Rusting


  Corrosion of iron, the chemical formula for rust is hydrated iron oxide. For iron to test their must be enough of both oxygen and and water
• if the more reactive one already has the oxygen/ already has less electrons, nothing will change.
• Reduction 


  When a substance loses oxygen and/or gains electrons
• oxidation 


  when a substance gains oxygen and/or loses electrons
• What happens in a displacement reaction?

  The more reactive metal replaces the other metal as it is more or less reactive then the other metal.
• What is the reactivity series?

  A list of metals which go from most reactive to least reactive
• 3 Most reactive metals in reactivity series?

  Potassium, Sodium, Calcium
• 3 least reactive metals in the reactivity series?

  Copper, silver , gold
• Ways of extracting metals?

  Phyomining, Bio-leeching , Mining
• What is phytomining?

  1. Plants are used to absorb metal compounds ( mainly copper )

  
  

  2. The plants are harvested, then burned to produce ash, which contains the metal compounds

  
  

  3. An acid is added to the ash to produce a solution containing dissolved metal compounds
• What is bioleeching?

  Bioleeching is the process of using a bacteria to harvest low-grade ores such as copper