chemistry crossword

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