Chemistry Crossword

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Across
  1. 4. Neutral particles
  2. 5. Substances that help a reaction proceed faster.
  3. 8. Both metallic and non-metallic properties
  4. 9. Takes place when two or more substances combine to form new substances
  5. 11. Pure substances formed as a result of the attraction between ions
  6. 14. Chemical reaction that absorbs heat energy
  7. 18. Negative ion
  8. 19. Can be a solid or a gas
  9. 20. Number above the element's symbol on the left
  10. 23. Mass of one atom of an element
  11. 24. Atom or a group of atoms that has become electrically charged because it has lost or gained electrons.
  12. 25. Most stable and unreactive elements.
Down
  1. 1. New materials produced by the reaction
  2. 2. Materials at the start of a reaction
  3. 3. Chemical reaction that releases heat energy
  4. 6. Most reactive non-metals
  5. 7. Slow chemical change
  6. 10. Chemical reaction that occurs when oxygen reacts with a new substance to form a new substance and give off energy
  7. 12. Positive ion
  8. 13. Good insulators
  9. 15. Negative atoms
  10. 16. Represents the sum of the number of protons and neutrons in an atom
  11. 17. Chemical reaction that takes place in the cells in your body.
  12. 21. Shiny, malleable and ductile
  13. 22. Positive atoms