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
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
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
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
slaked lime, Ca(OH)2
sodium chloride, NaCl
From which of the following substances can a solid be obtained by process of sedimentation?
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
Which of the following techniques may be used to separate a mixture of plant pigments into their individual components?
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?
Which of the following separation techniques is NOT used during the extraction of sucrose from sugar cane?
A protein, X, is hydrolysed using a dilute acid. The BEST method of separating and identifying the products is by
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
calcium sulphate and ammonium chloride
calcium chloride and ammonium sulphate
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
Which of the following substances would be expected to show the LEAST solubility in water?