mixtures and chromatography

Question 1

Unlike compounds, different parts of mixtures have no ..

Answer 1

chemical bonds
the parts of a mixture can be either elements or compounds and can be separated out by physical methods such as filtration, crystallisation , simple distillation, fractional distillation and chromatography

Question 2

examples of mixtures

Answer 2

air is a mixture of gases, mainly nitrogen , oxygen, co2 and argon . These gases can be separated out fairly easily.

Crude oil is a mixture of different length hydrocarbon molecules

Question 3

Property of a mixture are just a ———– of the property of the —————- ————.

Answer 3

The chemical property of the substance aren’t affected by it being part of the mixture

For example, a mixture of iron powder and sulphur powder shows properties of both. Contain bright yellow bits and grey magnetic bits

Question 4

Chromatography PRACTICAL 1-5

Answer 4

1) Draw line near bottom of sheet of filter paper ( use pencil, there insoluble in solvent )

2) Add spot of ink to the line and place sheet in a beaker of solvent

4) Make sure ink does not touch solvent of water or ethanol

5) Place lid on top of container to stop the solvent evaporating

Question 5

Chromatography PRACTICAL 6-10

Answer 5

6) solvent seeps up the paper, carrying ink with it

7) Each different dye in ink will move up the paper at different rates so the dyes will separate out. Each dye will form a spot in different place - One spot per dye in ink

8) If any of the dye is insoluble in the solvent, they’ll stay on baseline

9) when solvent has nearly reached the top of the paper, take the paper out and leave it to dry

10) end of result is pattern of spots = chromatogram