chemistry crossword

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Across
  1. 3. how well a substance dissolves in another.
  2. 5. when a substance can be pounded or rolled into sheets of metal.
  3. 7. chemical reaction that releases heat energy.
  4. 8. positively charged center of an atom, contains protons and neutrons
  5. 9. a system of easy to see warning symbols on hazards material
  6. 10. the kind of mixture that the elements are visual in the mixture
  7. 12. compounds are pure substances consisting of at least one metal and one non-metal.
  8. 14. that has become eclectically charged because it has lost or gained electrons
  9. 15. is the mass of one atom or element
  10. 16. the amount of mass in a given volume of a substance.
  11. 18. how well a substance is conductible with electricity.
  12. 19. the rows on a periodic table
  13. 20. has both metallic and non-metallic properties.
  14. 21. chemical reaction that absorbs heat energy.
  15. 23. a slow chemical change that occurs when oxygen in the air reacts with a metal
  16. 24. how a solid can be stretched and made into a long wire.
Down
  1. 1. a group of 18 elements in the periodic table
  2. 2. when a liquid changes into a gas at a certain temp.
  3. 4. when oxygen reacts with a substance to create a new substance and give off energy.
  4. 6. when a solid changes into a liquid at as certain temp.
  5. 10. a compound where two non-metals are combined.
  6. 11. is a material that can not be broken down into a simper substance.
  7. 13. poisons
  8. 17. how well a substance can stand not getting damaged or scratched.
  9. 22. the vertical columns on a periodic table