Science Crossword

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Across
  1. 4. Substance made of 2 or more elements that are bonded.
  2. 6. Substance made of 2 or more elements that are NOT bonded.
  3. 12. 2nd element in the halogens column.
  4. 13. ___ help speed up the reaction.
  5. 18. What type of reaction is it when something burns or explodes?
  6. 19. Hydrogen and oxygen gas explode together to form ___ ___.
  7. 22. Reaction rate can be affected by the ____ of reactants.
  8. 23. Have positive charges.
  9. 24. What is the solid called when 2 solutions are mixed together?
  10. 26. 84 elements are ___.
  11. 27. Where neutrons and protons are found.
  12. 29. Have neutral charges.
  13. 30. Rusting is a ___ change.
Down
  1. 1. Has 6 neutrons.
  2. 2. Cu is ___.
  3. 3. Special type of catalysts are called ___.
  4. 5. Ice cream melting is a ___ change.
  5. 7. Have negative charges.
  6. 8. These are fast-moving neutral particles that fill atoms.
  7. 9. Number of protons and neutrons is called the ___ ___.
  8. 10. What do you call the larger structures formed by atoms?
  9. 11. Who discovered neutrons?
  10. 14. Electrons orbit the nucleus in ___.
  11. 15. Surname of a physicist who experimented with radio-active particles.
  12. 16. K is the symbol for ___.
  13. 17. What does 'aq' stand for?
  14. 20. The ___ ___ is the number of protons in the nucleus.
  15. 21. Atoms are mainly ___ ___.
  16. 25. Elements are made of ___.
  17. 28. Elements are shortened down to one or two letters which is called the ___.