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- 1. Multiple Choice
At a stage in the process of extracting sucrose from sugar cane, lime is added to the sucrose solution in order to
lower the pH of the solution
raise the pH of the solution
stop the sucrose changing into sugars
increase the percentage of sugar that would crystallize out
- 2. Multiple Choice
A mixture of copper(II) oxide and copper(II) sulfate is BEST separated by
distilling the mixture
heating the mixture and condensing
shaking with excess water and then filtering
shaking with excess water followed by fractional distillation
- 3. Multiple Choice
A separating funnel can be used to separate a mixture of
kerosene and water
kerosene and ethanol
solid sodium chloride and water
solid sodium chloride and kerosene
- 4. Multiple Choice
The pH of fresh sugar cane juice which is usually in the range 5.0 - 5.5 can be changed to 7.5 - 8.0 for more efficient processing by adding
acetic(ethanoic) acid, CH3CO2H
limestone, CaCO3
slaked lime, Ca(OH)2
sodium chloride, NaCl
- 5. Multiple Choice
From which of the following substances can a solid be obtained by process of sedimentation?
Gels
Foams
Emulsions
Suspensions
- 6. Multiple Choice
Which of the following statements correctly describes the effect of temperature on the solubility of solids in water?
As temperature increases, the solid melts
As temperature increases, less solid dissolves
As temperature decreases, solubility decreases
As temperature decreases, there is no change in solubility
- 7. Multiple Choice
Which of the following techniques may be used to separate a mixture of plant pigments into their individual components?
Centrifugation
Solvent extraction
Fractional distillation
Paper chromatography
- 8. Multiple Choice
Separation of mixtures is based on specific properties of the components in the mixture. Which of the following properties is used to separate a mixture of oil and water?
Solubility
Viscosity
Particle size
Boiling point
- 9. Multiple Choice
Which of the following separation techniques is NOT used during the extraction of sucrose from sugar cane?
Filtration
Precipitation
Centrifugation
Chromatography
- 10. Multiple Choice
A protein, X, is hydrolysed using a dilute acid. The BEST method of separating and identifying the products is by
Chromatography
Crystallization
Distillation
Fractional distillation
- 11. Multiple Choice
A mixture of ammonium chloride and calcium sulphate is heated, in the apparatus below, until no further change takes place. The sublimate would MOST probably be
ammonium chloride
calcium sulphate
calcium sulphate and ammonium chloride
calcium chloride and ammonium sulphate
- 12. Multiple Choice
Sublimation can be used in separating
suspended solids from a liquid
a pair of liquids that do not mix
components of a liquid with similar boiling points
a solid with weak interparticle forces from one with strong forces
- 13. Multiple Choice
Which of the following substances would be expected to show the LEAST solubility in water?
Ammonia
Ethanol
Iodine
Lithium chloride
- 14. Multiple Choice
Which of the following techniques is generally used to separate a mixture of miscible liquids?
Fractional distillation
Filtration
Decantation
Crystallization
- 15. Multiple Choice
Which of the following techniques is used to separate a precipitate from a reaction mixture?
Crystallization
Evaporation
Filtration
Fractional distillation
- 16. Multiple Choice
Which of the following techniques could be used to separate a mixture of inks?
Centrifugation
Chromatography
Filtration
Fractional distillation
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