Mixtures + Chromatogrphy

Question 1

Define the term ‘mixture’:

Answer 1

Elements/compounds mixed together that are separated using physical methods e.g. chromatography, filtration, crystallizations, fractional distillation, simple distillation

Question 2

Examples of mixtures?

Answer 2

Air = nitrogen, argon, carbon dioxide + oxygen

Crude oil = different lengths of hydrocarbons

Question 3

How are properties of the original elements/compounds changed when it becomes a mixture?

Answer 3

Stays the same both chemical + physical

Question 4

What is chromatography?

Answer 4

The separation of substances to find out what it’s made of

Question 5

In which situations is chromatography used?

Answer 5

Test for unknown substances at crime scenes + for PEDs during professional sport events.

Question 6

How do you conduct the chromatography practical?

Answer 6

1 - draw a line around the bottom of the filter paper using a pencil (insoluble)
2 - add a spot of ink on the line
3 - put a solvent in a beaker = ethanol/water (dissolve different things)
4 - lower the paper, don’t touch solvent
5 - place lid on top = prevents evaporation
6 - solvents seeps up paper taking dye with it (solvent front = how far water goes up paper)
7 - dyes travel up at different rates so it’s separates
8 - insoluble = stays at baseline
9 - when the solvent has nearly reached the top of the paper take it out
10 - end result = chromatography