Time To Change

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Across
  1. 6. Lots of the same molecules joined or bonded together (8)
  2. 7. This tastes bitter (4)
  3. 8. A change that results in a new substance being formed (8)
  4. 9. The solid that results from two liquids being combined (11)
  5. 12. Hydrogen ... , Elephant's Toothpaste (8)
  6. 16. An example of a physical change (10)
  7. 17. So small you need a powerful microscope to see (4)
  8. 18. There are 92 of these sort of elements (7)
  9. 20. This tastes sour (4)
Down
  1. 1. Small group of atoms (8)
  2. 2. An element whose chemical symbol matches its English name (6)
  3. 3. An element with a symbol that does not match its English name (6)
  4. 4. This tells you whether a substance is acid or base (9)
  5. 5. Speeds up a reaction without being used itself (8)
  6. 10. A method of separating two mixtures (11)
  7. 11. A change in which no new substances are produced (8)
  8. 13. A pure substance that cannot be broken down into other substances
  9. 14. An action that causes physical change in size (8)
  10. 15. ... table: a list of all the known elements (8)
  11. 19. The language by which some elements receive their chemical symbol (5)