SCIENCE

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Across
  1. 4. the new substance created in a chemical reaction
  2. 6. a chemical combination of two or more elements in a specific ratio
  3. 9. numerical prefix for three
  4. 10. numerical prefix for five
  5. 12. a kind of change when a material changes state, (or appearance), but does not change composition. This process is reversible.
  6. 13. smallest particle of matter with a negative charge
  7. 14. can be made into thin strands of wire
  8. 16. vertical groups of elements with similar properties
  9. 17. an atom that has become electrically charged because it has either gained or lost electrons
  10. 18. can be easily separated
  11. 19. a substance that helps speed up the rate of reaction between reactants
  12. 21. pure substance
  13. 23. smallest particle of matter with a neutral charge
  14. 24. an organic catalyst
Down
  1. 1. numerical prefix for four
  2. 2. numerical prefix for one
  3. 3. an element that has metallic and non-metallic properties
  4. 5. a kind of change where the reactants either create or turn into a new substance. This process is not reversible.
  5. 6. a chemical reaction that occurs when oxygen reacts to another substance to create a new one
  6. 7. pounded or rolled into sheets
  7. 8. numerical prefix for two
  8. 11. can not be separated easily
  9. 12. smallest particle of matter with a positive charge
  10. 15. the most reactive non-metals
  11. 20. the smartest part of an element that is representative of that element, a neutral particle made up of protons, neutrons and electrons
  12. 22. the positively charged centre of an atom, made up of neutrons and protons