Physical and chemical changes

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Across
  1. 1. a substance diffused in the air
  2. 5. sub-atomic particle
  3. 6. _____are changed into other substance
  4. 9. compound two molecular bonded
  5. 12. columns of element in the periodic table
  6. 14. pure substance
  7. 16. there are 6_____ in school
  8. 17. change of state from solid to a gas
  9. 18. emit of gas or vapour
  10. 21. liquid to gas same as evaporate
  11. 22. when substance particle are collide with each other
  12. 23. one atom
  13. 24. only two atoms
  14. 26. is the abundance of a consitituent divded by the total volume
  15. 27. easily becomes a gas
Down
  1. 2. two reactant makes_____
  2. 3. chain of molecular simpler to each other repeating
  3. 4. an arrangement in space of isolated points in a regular pattern
  4. 7. speeds the chemical reaction
  5. 8. two or more different substance bonded together e.g. water
  6. 10. when the environment does damage to metal
  7. 11. gas turn to liquid
  8. 13. you can soeed this up by adding heat engery
  9. 14. type of catalyst
  10. 15. water turns to gas when heated
  11. 19. element into a table
  12. 20. ice in the sun
  13. 25. two attracted to each other