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6. When a reversible reaction is at equilibrium, how does the rate of the forward reaction compare with the rate of the reverse reaction?

  • The forward reaction and and reverse reaction occur simultaneously at the same rate.
  • The forward reaction occurs at a faster rate than the reverse reaction.
  • The reverse reaction occurs at a faster rate than the forward reaction.
  • It depends on the reaction conditions.

7. What should the flame colour be in a flame test for barium?

  • Green
  • Red
  • Yellow
  • Brown

8. What solution is used to test for sulfate ions?

  • Magnesium chloride
  • Barium chloride
  • Strontium chloride
  • Calcium chloride

9. Which of these can chemical analysis be useful for?

  • Medicinal use.
  • Forensic science.
  • All three.
  • River pollution.

10. Which compound group reacts with dilute acid to form carbon dioxide?

  • Nitrates
  • Halides
  • Carbonates
  • Sulfates

11. How do we test for halide ions?

  • Perform a flame test.
  • Add dilute nitric acid followed by silver nitrate solution and see if a precipitate forms.
  • Add dilute hydrochloric acid followed by barium chloride to see if a white precipitate forms.
  • Add dilute sodium hydroxide solution to see if a precipitate forms.

12. I have a sample of hydrochloric acid of concentration 73g/dm3. What is the concentration in mol/dm3?

  • 1mol/dm3.
  • 1.5mol/dm3.
  • 2 mol/dm3.
  • 3mol/dm3.

13. Which of these indicators is NOT used in titration?

  • Litmus
  • Phenolphthalein
  • Universal indicator
  • Methyl orange

14. What costs are a factor of making ammonia by the Haber process?

  • Extraction of materials, a catalyst, energy, equipment, wages.
  • Raw materials, energy, wages.
  • Extraction of materials, energy.
  • Wages, a catalyst, equipment.

15. Which of the following is correct for all of the named precipitate reactions between sodium hydroxide and the metals?

  • Aluminium = white, Magnesium = white, Copper (II) = blue, Iron (II) = green, Iron (III) = brown
  • Aluminium = white, Magnesium = white, Copper (II) = green, Iron (II) = green, Iron (III) = brown
  • Aluminium = white, Magnesium = white, Copper (II) = blue, Iron (II) = brown, Iron (III) = yellow
  • Aluminium = silver, Magnesium = white, Copper (II) = blue, Iron (II) = red, Iron (III) = brown