Chemistry Crossword

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Across
  1. 1. system of easy-to-see warning symbols on hazardous materials
  2. 4. neutral particle in the nucleus of an atom
  3. 8. metals group 1 elements in the periodic table, not including hydrogen; the most reactive of the metals
  4. 9. mixture mixture in which the different substances that make up the mixture are visible
  5. 12. substance that reacts with another substance
  6. 15. change of state from a solid to a liquid
  7. 17. change of state from a solid to a gas or from a gas to a solid
  8. 18. number number of protons in the nucleus of one atom of an element
  9. 19. neutral particle made up of a nucleus containing protons and neutrons
  10. 20. pure substance that cannot be broken down into other substances
  11. 21. horizontal row of elements in the periodic table
Down
  1. 2. anything that has mass and occupies space
  2. 3. cloudy mixture in which tiny particles of one substance are held within another and particles cannot be separated
  3. 4. gases group 18 elements in the periodic table
  4. 5. homogeneous mixture
  5. 6. mass of a substance that can dissolve in a given amount of solvent to
  6. 7. dull, brittle element that does not conduct electricity
  7. 9. element that has both metallic and non-metallic properties
  8. 10. change change that results when two or more substances react to create a different substance or substances
  9. 11. amount of mass in a given volume of a substance
  10. 13. solution solution in which water is the solvent
  11. 14. positively charged particle in the nucleus of an atom
  12. 16. vertical column of elements in the periodic table
  13. 21. substance substance made of only one kind of matter