chemistry crossword

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Across
  1. 5. group 17 in the periodic table
  2. 6. pure substance that cannot be broken down
  3. 7. releases energy
  4. 8. a description of how a substance reacts with another substance
  5. 11. smallest part of an element that is representative of that element
  6. 12. substance that helps a reaction proceed more quickly
  7. 13. principle that mass is the same in reactants and products
  8. 15. change of state from gas to solid
  9. 17. measure of atomic mass amu
  10. 19. chemical reaction that occurs when oxygen reacts and gives off energy
  11. 22. atom that has become electrically charged
  12. 23. mass of one atom of an element
  13. 24. amount of mass in a given volume
Down
  1. 1. group 2 elements in the periodic table
  2. 2. pure substance formed with at least one metal and one non metal
  3. 3. anything that has mass and takes up space
  4. 4. change of state from a liquid to solid
  5. 9. absorbs energy
  6. 10. a reaction that takes place when two or more substances form a new substance
  7. 12. an experiment in which all reactants and products are accounted for
  8. 14. group 1 elements in the periodic table
  9. 16. ability to conduct electricity
  10. 18. chemical combination of two or more elements
  11. 20. invisible negatively charged particle
  12. 21. number number of protons and neutrons in an element