Chemistry Crossword

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Across
  1. 2. Sub-atomic particles with no charge
  2. 4. A row in the periodic table
  3. 6. These small units make up all forms of matter including living and non living things.
  4. 8. Sub-atomic particles with positive charge
  5. 11. Reactions that release energy
  6. 13. We cannot live without this gas
  7. 14. A table in which elements are organised
  8. 17. The acid that is produced in our stomach
  9. 18. This has the chemical symbol of Au
  10. 19. This has the chemical symbol of Mg
  11. 20. Substance that speeds up a reaction without itself taking part in it
  12. 21. Lightest elment
  13. 23. It is equal to the number of protons
Down
  1. 1. What we get when we add number of protons and neutrons
  2. 3. Reactions that consume energy
  3. 5. They are sub-atomic particles having negative charge
  4. 7. They are made up of two or more types of atoms.
  5. 9. Increasing ______ will speed up the rate of a chemical reaction
  6. 10. Reaction type in which things burn
  7. 12. A change in which new substance is formed
  8. 15. A column in the periodic table
  9. 16. These are either positively charged or negative charged
  10. 22. Things which react are known as _______