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15 questions
What method would you use to separate a mixture of salt and water so that you can get keep the salt AND the water?
sorting by hand
distillation
chromatography
Dyes in a felt-tip pen may be separated by....
Distillation
Decanting
Chromatography
Centrifuge
No matter what you do, sand will not dissolve in water, because sand is _________.
dissolved
soluble
insoluble
aqueous
What is the name of this separation technique?
Simple distillation
Fractional distillation
Boiling
Evaporation
Which separation technique is used to obtain pure water from seawater?
Simple distillation
Filtration
Chromatography
Evaporation
What is the name of this separation technique?
distillation
filtration
evaporation
chromatography
Which ink is most soluble?
Blue
Red
Yellow
Green
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
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 100oC.
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.
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