Chemistry Crossword

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Across
  1. 3. method of separating solids and liquids using paper
  2. 7. What is the most common gas in the atmosphere
  3. 8. something with a pH level lower than 7
  4. 10. method of separating liquids of different boiling points
  5. 12. A gas that makes limewater turn chalky
  6. 13. An element that makes a makes a squeaky noise in a test
Down
  1. 1. the colour of anhydrous copper sulfate
  2. 2. a substance used to measure the pH of a thing
  3. 4. An object changing from gas to liquid state
  4. 5. something with a pH level higher than 7
  5. 6. method of separating dyes in an ink
  6. 9. besides carbon dioxide and a salt, what does acid+carbonate make
  7. 11. another method of measuring the pH of a substance
  8. 12. A green-coloured gas