Chemistry Crossword

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Across
  1. 4. A system of easy-to-use warning symbols for hazardous materials
  2. 6. slow chemical change that occurs when oxygen in the air reacts with metal
  3. 9. description of a solid that can be stretched into a long wire
  4. 10. ability of a substance to conduct electricity or heat
  5. 11. Change of state from a gas to a liquid
  6. 13. Solid, liquid, gas and plasma
  7. 18. chemical reaction that produces heat
  8. 19. Measure of atomic mass
  9. 22. Change of state from a liquid to a solid
  10. 23. Amount of mass in a given volume of a substance
Down
  1. 1. group 17 elements in the periodic table least reactive metals
  2. 2. number of protons in the nucleus equal to electrons
  3. 3. Change in the appearance or state of a substance that does not change the composition
  4. 5. Change of state from solid to a liquid
  5. 6. substance that speeds up chemical reactions
  6. 7. positively charged center of an atom contains protons and nuetrons
  7. 8. chemical reaction that absorbs heat
  8. 12. invisible negatively charged particle that orbits the nucleus of an atom
  9. 14. Change of state from a liquid to a gas
  10. 15. pure substance formed when at least one ,metal and nonmetal combine
  11. 16. Change of stare from a solid to gas or a gas to a solid
  12. 17. a material that electricity or heat can move through easily
  13. 20. chemical combination of two or more substances in a specific ratio
  14. 21. pure substance that cannot be broken down into other substances contains one atom
  15. 24. Catalyst involved in chemical reactions in living things