Chemistry Revision

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Across
  1. 4. Fe
  2. 6. the type of change where particle structure is not effected and it is easily reversed
  3. 10. something that starts or speeds up a chemical reaction
  4. 11. shiny, malleable, conduct electricity and often react with acids
  5. 12. A substance that cannot be broken down into other substances.
  6. 13. A chart arranging elements according to their properties
  7. 14. The number of protons in an atom (provided on the periodic table)
  8. 17. Number 6
  9. 18. Positively charged part of an atom.
Down
  1. 1. A particle made of two or more elements
  2. 2. this is increased if we cut things into smaller pieces
  3. 3. the type of change that alters particle structure and is difficult to reverse
  4. 5. Easily separated
  5. 7. He
  6. 8. Are particles made of two atoms joined together
  7. 9. Characteristics of both metals and non-metals
  8. 15. The part of an atom made of protons and neutrons
  9. 16. Dull, brittle, poor conductors and do not react with acids