C1 - Atomic Structure 3

Question 1

Can mixtures be easily seperated?

Answer 1

Unlike compounds, yes.

There’s no chemical bond between different parts of a mixture.

Question 2

Components of a Mixture

Answer 2

Either elements or compounds.
Can be separated by physical methods like filtration, crystallisation, simple distillation, fractional distillation and chromotography.

Question 3

What’s in the mixture of air?

Answer 3

Gases - nitrogen, oxygen, carbon dioxide and argon.

These can be separated quite easily.

Question 4

Properties of a Mixture

Answer 4

Mixture of the properties of the separate parts.

Chemical properties of a substance aren’t affected by it being part of a mixture

Question 5

Whats chromatography used for?

Answer 5

To separate different dyes in an ink.

Question 6

First 5 Steps of the Chromatography practical

Answer 6

• Draw a line at the bottom of a sheet of filter paper. (Pencil)
• Add a spot of ink to the line and place the sheet in a beaker of solvent e.g water.
• The solvent used depends on what’s being tested. Some compounds dissolve well in water, in other solvents ethanol is needed.
• Make sure the ink isn’t touching the solvent, don’t want to dissolve it.
• Place a lid on top of the container to stop the solvent evaporating.

Question 7

6-10 Steps of Chromatography Practical

Answer 7

• Solvent seeps up the paper, carrying ink with it.
• Each different dye in the ink will move up the paper at a different rate so the dyes will separate out. Each dye will form a spot in a different place. 1 spot per dye in the ink.