QUIZ
Separation of Mixtures/Solubility
3 months ago by
13 questions
Q.

At a stage in the process of extracting sucrose from sugar cane, lime is added to the sucrose solution in order to

answer choices

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

Q.

A mixture of copper(II) oxide and copper(II) sulfate is BEST separated by

answer choices

distilling the mixture

heating the mixture and condensing

shaking with excess water and then filtering

shaking with excess water followed by fractional distillation

Q.

A separating funnel can be used to separate a mixture of

answer choices

kerosene and water

kerosene and ethanol

solid sodium chloride and water

solid sodium chloride and kerosene

Q.

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

answer choices

acetic(ethanoic) acid, CH3CO2H

limestone, CaCO3

slaked lime, Ca(OH)2

sodium chloride, NaCl

Q.

From which of the following substances can a solid be obtained by process of sedimentation?

answer choices

Gels

Foams

Emulsions

Suspensions

Q.

Which of the following statements correctly describes the effect of temperature on the solubility of solids in water?

answer choices

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

Q.

Which of the following techniques may be used to separate a mixture of plant pigments into their individual components?

answer choices

Centrifugation

Solvent extraction

Fractional distillation

Paper chromatography

Q.

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?

answer choices

Solubility

Viscosity

Particle size

Boiling point

Q.

Which of the following separation techniques is NOT used during the extraction of sucrose from sugar cane?

answer choices

Filtration

Precipitation

Centrifugation

Chromatography

Q.

A protein, X, is hydrolysed using a dilute acid. The BEST method of separating and identifying the products is by

answer choices

Chromatography

Crystallization

Distillation

Fractional distillation

Q.

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

answer choices

ammonium chloride

calcium sulphate

calcium sulphate and ammonium chloride

calcium chloride and ammonium sulphate

Q.

Sublimation can be used in separating

answer choices

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

Q.

Which of the following substances would be expected to show the LEAST solubility in water?

answer choices

Ammonia

Ethanol

Iodine

Lithium chloride

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