Chemistry Crossword

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