Chemistry Crossword

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Across
  1. 2. an experiment in which all reactant and all product of a chemical reaction are accounted for.
  2. 5. mass of one atom in an element
  3. 8. group 2 on the periodic table
  4. 11. a slow chemical change when oxygen reacts with metal
  5. 12. metal+non-metal
  6. 13. Non-reversible
  7. 19. natural gases
  8. 20. a new substance produced in a chemical reaction between reactant
  9. 21. non-metal+non metal
Down
  1. 1. chemical which absorbs heat is
  2. 2. a chemical reaction that takes place in the cell of your body
  3. 3. substance that helps chemical reaction to proceed more quickly
  4. 4. cloudy mixture
  5. 6. number of protons in the nucleus of one of an element
  6. 7. Reversible
  7. 9. a substance that react's with other substance to create a new substance with a different properties
  8. 10. the smallest part of an element that is representative of the element
  9. 13. ability of a substance to conduct electricty or heat
  10. 14. chemical which release heat energy is
  11. 15. very reactive material
  12. 16. chemical reaction that occurs when oxygen reacts with other substance which gives of energy
  13. 17. neutral particle
  14. 18. negative charges
  15. 20. positive charges