CHAPTER 9: Chemical industry

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Across
  1. 2. Extraction method for iron, zinc and copper
  2. 3. Rust prevention method that add blocks of a reactive metal to the iron surface
  3. 6. Extraction method for aluminum
  4. 7. Is the main use of ammonia
  5. 8. Mixture of iron, carbon and another metal
  6. 9. Rust prevention method that add a layer of oil over steel
  7. 12. Rust prevention method that add a layer of plastic over steel
  8. 15. Metal that can be added to an alloy steel to avoid rust
  9. 17. Rust prevention method that add a layer of zinc over steel
  10. 18. Element used to purify pig iron
  11. 19. Main ore of iron
  12. 20. Rust prevention method that add a layer of chromium or tin over steel
Down
  1. 1. Mixture of iron and carbon
  2. 4. Rust prevention method that supply electrons using an electrolytic cell
  3. 5. Red-Brown powder consisting in hydrated iron oxide
  4. 10. It is made from sulphur by the Contact process
  5. 11. Rust prevention method that add a layer of paint over steel
  6. 13. Is produced by the Haber-Bosch method
  7. 14. High tower used to extract iron
  8. 16. Main ore of aluminum