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6. Why do colours move different distances in chromatography?

  • Depending on their viscosity
  • Depending on their colour
  • Depending on their solubility
  • Depending on their flammability

7. What is distillation used for?

  • Separate mixtures of miscible liquids with different boiling points or collect the solvent
  • Freezing water molecules
  • Collect an insoluble and soluble solute at different temperatures
  • Making water molecules

8. How do you test for halide ions?

  • Flame test
  • Fizzes in hydrochloric acid
  • Add dilute nitric acid and then silver nitrate solution and see what colour the precipitate is
  • Add bromine water and it will go clear

9. Give two ways to test for positive ions

  • Flame test or with sodium hydroxide solution
  • Barium chloride and sodium hydroxide solution
  • Flame test or with bromine water
  • Barium chloride and bromine water

10. What are some disadvantages of using modern instrumental methods?

  • Training needed, time consuming, results can only be interpreted by comparison
  • Slow, noisy and expensive
  • Expensive, special training needed, results can only be interpreted by comparison of data
  • Expensive, takes a long time, training needed

11. How does a mass spectrometer work?

  • Weighs the individual molecules
  • Generates electric current
  • Matches the compounds against the mass spectra of known substances
  • Injects bromine water into the compound

12. What colour does calcium go in a flame test?

  • Crimson
  • Brick red
  • Apple green
  • Purple

13. What colour is the precipitate of iodide ions?

  • Cream
  • White
  • Yellow
  • Orange

14. What colour is the copper hydroxide precipitate?

  • Blue
  • Green
  • Brown
  • Orange

15. What does a mass spectrometer do?

  • Provides the bromine water
  • Provides the electric current
  • Quickly identifies individual compounds
  • Provides the magnetic current

16. Where is the molecular ion peak found?

  • Furthest peak on the right of the mass spectrum
  • Tallest peak
  • Furthest peak on the left of the mass spectrum
  • Central peak

17. What is the molecular ion peak?

  • Shows the relative molecular mass of a substance where the individual compound with a large peak corresponds to an ion with one electron removed
  • Describes the reactivity of that compound
  • Shows the atomic number in a compound
  • Shows the atomic number of one of the elements

18. How is a mixture carried through a column in gas chromatography?

  • Electric currents
  • By a carrier gas that helps it through a colum packed with solid particles
  • Liquid with a similar boiling point
  • Carrier gas

19. What are miscible liquids?

  • Liquids that can be compressed
  • Liquids that possess solid and liquid properties
  • Liquids that dissolve in each other and do not form separate layers
  • Liquids that do not take the shape of a container

20. How can you then identify compounds?

  • Put it through an electric current to see its electrical conductivity
  • Compare to results for known compounds
  • A bromine water and see what colour it turns
  • Heat it to see its boiling point