Reactivity series

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Across
  1. 2. What colour flame does sodium produce when reacted with water?
  2. 3. What's the least reactive element?
  3. 6. What prevents rusting?
  4. 9. What is 3rd in the reactivity series?
  5. 10. What's a reaction that gives out heat?
  6. 13. What's a reaction that takes in heat?
Down
  1. 1. What gas is produced when a metal reacts with acid?
  2. 4. What appears when potassium reacts with water?
  3. 5. What metal is often used to protect boats from rusting?
  4. 7. What's the most reactive element?
  5. 8. Metal used to coat cans?
  6. 11. What is the gas needed for rusting?
  7. 12. What is the reaction when an more reactive element swaps with a less reactive element?