1
Q
Can mixtures be easily seperated?
A
Unlike compounds, yes.
There’s no chemical bond between different parts of a mixture.
2
Q
Components of a Mixture
A
Either elements or compounds.
Can be separated by physical methods like filtration, crystallisation, simple distillation, fractional distillation and chromotography.
3
Q
What’s in the mixture of air?
A
Gases - nitrogen, oxygen, carbon dioxide and argon.
These can be separated quite easily.
4
Q
Properties of a Mixture
A
Mixture of the properties of the separate parts.
Chemical properties of a substance aren’t affected by it being part of a mixture
5
Q
Whats chromatography used for?
A
To separate different dyes in an ink.
6
Q
First 5 Steps of the Chromatography practical
A
- 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.
7
Q
6-10 Steps of Chromatography Practical
A
- 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.
