Chemistry crossword

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Across
  1. 4. liquid that passes through the filter paper.
  2. 6. Process by which plants make their food
  3. 9. is used to cut glass.
  4. 12. good conductor of heat and electricity.
  5. 14. the gaseous state of water.
Down
  1. 1. is used to cool a system.
  2. 2. intermingling of particles.
  3. 3. helps to kill harmful microorganisms in water.
  4. 5. Natural gas
  5. 7. a water plant.
  6. 8. The layer that surrounds the earth.
  7. 10. people who practiced alchemy.
  8. 11. main air pollutant.
  9. 13. considered as the fourth state of matter.