Experimental Chemistry

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Across
  1. 4. an apparatus that measures the volume of a solution or liquid to 0.05 cm3
  2. 8. the method to collect gases that are more dense than air (e.g. Cl2, HCl)
  3. 12. a method used to separate and identify small amounts of substances that are dissolved in solvents, due to differences in solubility in a particular solvent
  4. 13. a method used to recover a liquid from a soluble solid-liquid mixture or to separate two miscible liquids with different boiling points; the liquid (with the lower boiling point) vaporises, enters the condenser, condenses back into a liquid, and is collected in a beaker as the distillate
  5. 14. an apparatus that measures mass to 0.01g or 0.001g
  6. 16. an apparatus that measures temperature
  7. 17. a chemical that reacts with the colourless substances separated by chromatography to form visible coloured products for analysis
  8. 20. a method used to separate a mixture of an insoluble solid and a liquid/solution
Down
  1. 1. we can dry a gas by passing it through a ______ _____ in appropriate apparatus (e.g. concentrated sulfuric acid for acidic gases, calcium oxide for alkaline gases, fused calcium chloride for most gases)
  2. 2. the method to collect gases that are less dense than air (e.g. NH3, H2)
  3. 3. the method to collect gases that are insoluble or have low solubility in water (e.g. CO2, H2, O2)
  4. 5. a method used to recover soluble solid from a liquid (for solutes such as sodium chloride whose solubility do not change much with temperature)
  5. 6. a pure substance has a _____ melting and boiling point
  6. 7. an apparatus that measures the volume of a solution or liquid to half of the smallest division (less accurate than pipette)
  7. 9. an apparatus that measures time
  8. 10. a method used to separate miscible liquid-liquid mixture whose boiling points differ less than 25ºC (set-up consists of a fractionating column)
  9. 11. a method used to recover soluble solid from a liquid; solution is first heated to make it saturated, before it is cooled to form crystals (for substances whose solubility differs appreciably with temperature or decomposes on heating)
  10. 15. a method used to separate immiscible liquids (e.g. oil and water); mixture is poured into the funnel and the denser layer is run off and collected first by opening the tap
  11. 18. an apparatus that measures the volume of gas to 0.5 cm3
  12. 19. an apparatus that measures exactly 25.0 cm3 of a solution or liquid