CHEMISTRY CROSSWORD

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Across
  1. 2. atoms that has become electrically charged because it either lost or gained electrons.
  2. 5. a chemical reaction to create new substances
  3. 6. substance that helps speeds up a chemical reaction.
  4. 8. dull,brittle element that does not conduct electricity.
  5. 9. chemical change that releases heat
  6. 11. group 17 in the periodic table, the most reactive non-metals
  7. 19. takes place when two or more substances combine to form new substances.
  8. 22. RESPIRATION a chemical reaction that takes place in the cells of our bodies
  9. 24. often liquid or gas at room temperature.
  10. 25. mass of one atom of an element calculated from the total number of protons.
  11. 27. a slow chemical change that occurs when oxygen in the air reacts with a metal.
Down
  1. 1. a new substance produced in a chemical reaction between reactants.
  2. 3. catalyst involved in chemical reactions in living things
  3. 4. can be in between metals and non-metals
  4. 7. a substance that reacts with another substance in a chemical reaction to create a new substance with different products or properties.
  5. 10. an experiment when one or more products of a chemical reaction can escape.
  6. 12. change in appearance or state of substance that does not change composition.
  7. 13. chemical change that absorbs heat
  8. 14. results from a chemical reaction
  9. 15. substance made of only one kind of matter, which has
  10. 16. different properties.
  11. 17. an experiment where all reactants and products of a chemical reaction are accounted for.
  12. 18. GASES group 18 elements in the periodic table, the most stable and non reactive elements
  13. 20. solids at room temperature.
  14. 21. invisible negatively charged particle that orbits the nucleus of an atoms.
  15. 23. a chemical reaction that occurs when oxygen reacts with a substance to form a new substance and gives off energy.
  16. 25. unique set of properties.
  17. 26. element that has both metallic and non-metallic properties