Chemistry Crossword

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Across
  1. 4. chemical reaction that releases heat energy
  2. 8. mixture in which the different substances are visible
  3. 10. when a new substance is formed and non-reversible
  4. 13. can be in between metals and non-metals
  5. 18. the number of protons in the nucleus of an atom
  6. 19. mixture of two or more pure substances that look like one substance
  7. 20. can eat away or corrode
  8. 21. contaminated material that is a threat to humans and health
  9. 23. substances in a reaction
  10. 25. chemical reaction that absorbs heat energy
Down
  1. 1. pure substance that cannot broken down any further
  2. 2. workplace hazardous materials information system
  3. 3. change in appearance or state
  4. 5. ability to conduct electricity or heat
  5. 6. the mass of all protons and neutrons in an atom
  6. 7. when a solid changes to a gas
  7. 9. when non-metal combine
  8. 11. the mixture of magic and chemistry
  9. 12. when a gas changes to a solid
  10. 14. shiniest of a substances,
  11. 15. electrically charged atoms
  12. 16. made up of one type of matter
  13. 17. the center of an atom
  14. 22. the horizontal rows on the periodic table
  15. 24. a compound of a metal and non-metal