Grade 9 Chemistry

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Across
  1. 1. The gas produced when a metal reacts with an acid
  2. 3. This was used by Rutherford to discover the nucleus
  3. 4. He discovered the neutron
  4. 5. When a metal reacts with water a metal _______ is formed
  5. 10. Ice melting is an example of this kind of reaction
  6. 12. This element has the symbol K
  7. 13. The number that tells you how many protons are in an atom
  8. 14. This element has the symbol Na
  9. 16. A pale yellow gas that is a halogen
  10. 18. One of the alkali metals
  11. 19. These particles have a positive charge
Down
  1. 2. A chemical reaction in which energy is given out
  2. 6. These particles have a negative charge
  3. 7. Any reaction where a substance combines with oxygen
  4. 8. This element has the symbol C
  5. 9. This is used to measure temperature changes
  6. 11. The number that tells you the number of protons and neutrons in an atom
  7. 13. One of the noble gases
  8. 15. Another term for burning
  9. 17. A yellowish green gas that is a halogen