Y10 test 2

• A more reactive metal will always displace a less reactive metal
• What is the most reactive metal?


  Potassium
• What is the least reactive metal?


  Gold
• Which is more reactive Zinc or Iron?

  Zinc
• Which metals burn easily with a coloured flame?

  Potassium, Sodium, Calcium and magnesium
• Which metals react slowly when heated with oxygen?

  Aluminium, Zinc, Iron, Lead and Copper
• Which metals don’t react at all when with oxygen?

  Silver and Gold
• Which element only has a reaction with oxygen when Hg is very hot?

  Mercury
• How does lithium react when with water?


  Floats on water, moves on surface, fizzing, releases gas
• How does sodium react when with water?


  Reacts faster / More violent, melts to form a ball
• How does potassium react when with water?

  More violent, burns with a purple flame
• Hydrogen + oxygen makes water
• What is oxidation?


  gain of oxygen or loss of electrons (becomes more positive)
• What is reduction?


  loss of oxygen or gain of an electrons ( becomes more negative )
• What is an oxidising agent?


  something that oxidises another substance. it is reduced in a chemical reaction
• What is a reducing agent?


  Something that reduces another substance. It is oxidised in a chemical reaction
• What is redox?


  oxidation and reduction at the same time
• What is corrosion?


  where metals react with acids, oxygen or any other chemicals
• the only thing that rusts is iron
• What speeds up rusting?


  salt
• Iron + oxygen —(water)—> hydrated iron (III) oxide (rust)
• What are the methods of rust prevention?


  Painting, oil and grease, galvanising, sacrificial protection, alloys
• How does painting prevent rust?


  Acts as a barrier to prevent rust
• How does oil and grease prevent rust?


  its acts as a barrier to stop oxygen
• How does galvanising stop rust?


  makes the oxygen react with zinc instead of iron
• Galvanising 


  covering and object in zinc. Zinc is more reactive so the oxygen will react with the zinc instead of the iron. It also self repairs
• How does sacrificial protection help stop rust?


  The more reactive thing reacts first
• What properties apply to all metals except mercury

  Ductile, maleable, shiny when cut, sonorous when struck, good conductors of heat and electricity