physical and chemical changes

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Across
  1. 2. a chemical substance consisting a large molecule
  2. 3. a state of of changing from solid to a liquid
  3. 5. a chemical which helps form a chemical reaction
  4. 6. a molecule that contains two atoms
  5. 7. a substance which is used at the beginning the start of a chemical reaction
  6. 10. a pure substance that is made u of a special atom
  7. 12. a gas that has a strong smell especially to breath in
  8. 14. when the substance reacts it causes to collide with each other
  9. 15. a procedure to make a chemical change
  10. 18. a single atom
  11. 20. a change straight from a solid to gas
  12. 21. form of substance that is normally a solid or liquid
  13. 22. to reach a temperature where the liquid starts to turn into gas.
  14. 24. a substance obtaining at the end of a chemical reaction
  15. 25. when a gas is transformed into liquid
  16. 26. rows of elements in a periodic table
  17. 28. to change a liquid to gas
Down
  1. 1. when the atoms are attracted to each other
  2. 3. a molecule which contains two or more atoms
  3. 4. an arrangement of particles in a pattern
  4. 8. an object that makes a chemical reaction change itself quickly
  5. 9. broken down particles.
  6. 11. an arrangement of elements into a table
  7. 13. a substance which is easily turned into gas physical
  8. 16. an amount of substance in the same area
  9. 17. the process of corroding, or metal that has been corroded
  10. 19. a substance thats made up of two or more different atoms with bound together
  11. 23. groups of two atoms which bound together
  12. 27. columns of elements that is made up of one atom