Food Chemistry - 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

What does the boiling chips do?

• Stop water from boiling

• Maintain the temperature of the mixture

• Smoothen the boiling

• Condense the hot vapour

Tags

NGSS.MS-PS3-4

NGSS.MS-PS1-4

NGSS.MS-PS3-5

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.

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

Tags

NGSS.MS-PS1-2

Which ink is a mixture?

• Blue

• Red

• Yellow

• Black

Referring to the chromatogram, black ink contains

• Blue, red and yellow ink only

• Blue, red, yellow and green ink

• Blue and yellow ink

• Black ink only

Tags

NGSS.MS-PS1-2

The setup above shows the separation of a mixture of sand and seawater. After filtering, which substance is found at E?

• water

• sea water

• salt

• sand

Tags

NGSS.MS-PS1-2