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?

• distillation

• chromatography

• filtration

• magnetic separation

Name the separation technique

• Chromatography

• Filtration

• Distillation

• Evaporation

What does the boiling chips do?

• Stop water from boiling

• Maintain the temperature of the mixture

• Smoothen the boiling

• Condense the hot vapour

In a salt water solution ...

• Salt is the solute and water is the solvent

• Salt is the solvent and water is the solute

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?

• Simple 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 ink is most soluble?

• Blue

• Red

• Yellow

• Green

Which ink is a mixture?

• Blue

• Red

• Yellow

• Black