Chemistry Crossword

12345678910111213141516171819202122232425
Across
  1. 2. pure substance that cannot be broken down into other substances
  2. 5. element that has both metallic and nonmetallic properties
  3. 6. chemical combination of two or more elements in a specific ratio
  4. 7. chemical reaction that absorbs energy
  5. 11. change of state from a gas to liquid
  6. 14. positively charged particle in the nucleus of an atom
  7. 16. chemical reaction that releases energy
  8. 17. homogeneous mixture
  9. 18. slow chemical change that occurs when oxygen in the air reacts with a metal
  10. 20. change of state from a solid to a liquid
  11. 21. group of atoms joined by covalent bonds
  12. 22. A system of easy-to-see warning symbols on hazardous materials
  13. 23. anything that has mass and occupies space
  14. 25. shiny, malleable, ductile element that conducts electricity
Down
  1. 1. substance that helps a chemical reaction to proceed more quickly
  2. 3. neutral particle in the nucleus of an atom
  3. 4. ability of a substance to conduct electricity or heat
  4. 8. change of state from a gas to a solid
  5. 9. group 17 elements in the periodic table; the most reactive nonmetals
  6. 10. chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy
  7. 12. change of state from a liquid to gas
  8. 13. change of state from a solid to a gas or gas to a solid
  9. 15. dull, brittle element that does not conduct electricity
  10. 19. horizontal row of elements in the periodic table
  11. 24. organic catalyst involved in chemical reactions in living things