Y10T2W7L2 Revision Separating Techniques

Open Ended

Open Ended

Open Ended

Multiple Choice

• Ethanol has a higher boiling point than water.

• Ethanol has a lower melting point than water.

• Ethanol has a higher melting point than water.

• Ethanol has a lower boiling point than water.

Multiple Choice

• This makes it impossible to calculate Rf values.

• This makes it impossible to use a locating agent.

• This results in a safety hazard caused by solvent fumes.

• This causes the spot nearest the bottom of the paper to catch up with the spot above it.

Multiple Choice

In the process of evaporation, which one of the following pieces of laboratory apparatus would NOT be used?

• filter funnel
• bunsen burner
• evaporating basin
• wire gauze

Multiple Choice

Which ink is most soluble?

• Blue

• Red

• Yellow

• Green

Multiple Choice

• A

• B

• C

• D

Multiple Choice

Select the correct equation to calculate R_f values.

• (Distance travelled by solvent) ÷ (Distance travelled by sample)

• (Distance travelled by sample) ÷ (Distance travelled by solvent)
  

Multiple Choice

Label number 1 in the above experiment.

• Solvent front

• Solvent

• Baseline

Multiple Select

R_{f values can be obtained with the following information.}

• Distance moved by the solvent.

• Width of the baseline.

• Length of the chromatography paper.

• Distance that the substance has moved.

Multiple Choice

What is the method suitable to obtain pure water from seawater.

• Simple distillation

• Fractional distillation

• Filtration

• Evaporation to dryness

Multiple Choice

• A

• B

• C

• D

Multiple Choice

What method is used to obtain copper(II) sulfate crystals from its solution?

• Crystallisation

• Evaporation to dryness

• Paper chromatography

• Fractional distillation

Multiple Choice

A mixture contains two substances. What property must be the two substances have for them to be separated by paper chromatography?

• Both substances must be soluble in the chromatography solvent,

• Both substances must have low boiling point.

• Both substances must be coloured.

• Both substances must be solid at room condition.

Multiple Choice

Filtration can be used to separate...

• an insoluble solid from a solution
• a soluble solid from a solution
• a dissolved solid from a solution

Multiple Choice

Which property indicates that a solid is pure?

• It burns completely in oxygen, leaving no residue.

• It has a fixed melting point.

• It has a fixed volume.

• It is soluble in water.

Multiple Choice

In the distillation apparatus shown, what are the parts labelled A and B?

• A = funnel, B = thermometer
• A = thermometer, B = funnel
• A = condenser, B = flask
• A = condenser, B = thermometer

Multiple Choice

Water and alcohol are easily separated by distillation because of their

• different densities
• different boiling points
• different colours
• different melting points

Multiple Choice

Distillation is used to separate ______.

• an insoluble solid from its solution.

• a soluble solid from its solution.

Multiple Choice

A pure substance shows -------spot(s) on chromatogram

• 0

• 1

• 2

• 3

Multiple Choice

Sodium chloride can be separated from rock salt by first adding water to the mixture to dissolve the sodium chloride. The separation then takes place in two stages:

• evaporation followed by filtration
•  distillation followed by decanting
• filtration followed by evaporation
• filtration followed by decanting

Multiple Choice

Which of the following pairs of substances may best be separated through distillation

•  sand and soil
• water and soil
• salt and sand
•  water and alcohol

Multiple Choice

Distillation is made up of ___

• boiling, evaporation and then condensation

• condensation, boiling and evaporation

Multiple Choice

A leibeg condenser is used in...

• Filtration

• Chromatography

• Evaporation

• Distillation