Puzzle 3: Materials, Corrosion, Alloys, Polymers & Haber Process

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Across
  1. 5. The temperature in degrees Celsius used as a compromise in the Haber process is __________
  2. 8. A material made from two or more different materials such as fibre glass is called a __________
  3. 9. The name for hydrated iron(III) oxide formed when iron corrodes is __________
  4. 13. The tough layer of aluminium __________ that prevents further corrosion of aluminium is Al₂O₃
  5. 14. The type of polymer that softens when heated and can be remoulded is called __________
  6. 15. The catalyst used in the Haber process is __________
  7. 17. The type of steel containing chromium and nickel that resists corrosion is __________ steel
  8. 19. A mixture of a metal with another element such as carbon is called an __________
  9. 21. The alloy of copper and tin is __________
  10. 22. The type of fertiliser that contains nitrogen phosphorus and potassium is abbreviated as __________
Down
  1. 1. The process of coating iron with zinc to prevent rusting is called __________
  2. 2. The fertiliser made by reacting ammonia with nitric acid NH₃ + HNO₃ → is __________
  3. 3. The pressure in atmospheres used as a compromise in the Haber process is __________
  4. 4. The industrial process that produces ammonia from nitrogen and hydrogen is the __________ process
  5. 6. The direction of the forward reaction N₂ + 3H₂ → 2NH₃ in the Haber process is __________
  6. 7. The term for what happens to unreacted nitrogen and hydrogen gases in the Haber process is that they are __________
  7. 10. The type of protection where a more reactive metal like zinc corrodes instead of iron is called __________ protection
  8. 11. The total greenhouse gas emissions caused by an activity or product over its lifecycle is called its carbon __________
  9. 12. The alloy of copper and zinc is __________
  10. 16. The type of reaction shown by the equation N₂ + 3H₂ ⇌ 2NH₃ is __________
  11. 18. The alloy of iron and carbon is __________
  12. 20. The type of polymer with crosslinks that does not soften when heated is called __________