1NA Separation Techniques

Charcoal powder is insoluble in water. When water is filtered, the charcoal powder becomes the _______.

• solute

• residue

• filtrate

• solvent

The image shows a mixture of concrete nails and saw dusts. What technique is best to use to separate the nails from the saw dusts?

• filtration

• chromatography

• distillation

• magnetic separation

Dyes in water soluble markers may be separated by means of

• Distillation

• Evaporation

• Chromatography

• Filtration

Which of the following statements tells us that a sample of liquid is pure water?

• It is colourless.

• It leaves no residue when filtered.

• It boils at 100^oC.

• It is odourless.

Which separation technique is used to obtain pure water from seawater?

• Distillation

• Filtration

• Chromatography

• Evaporation

For paper chromatography to work,

• the dyes must have different boiling points.

• the dyes must have different solubilities in the solvent.

• the starting line on the chromatogram must be drawn using pen.

• the starting line must be below the level of the solvent.

Which property is used to separate substances during filtration?

• Density

• Magnetism

• Particle Size

• Particle Weight

Circle the most soluble substance in on the chromatography paper below.

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

Which one of the following is a disadvantage of evaporation?

• It always requires heat
• It cannot be used for insoluble solids
• All of the solute is recovered
• The solvent (liquid part) is not recovered