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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?
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