separation of mixtures

Question 1

Filtration

Answer 1

This consists of a barrier which one component f a mixture can pass through but the other is caught by. e.g water goes through filter paper, rocks are caught by it.

Question 2

Distillation

Answer 2

One substance is evaporated off. e.g salt water is heated to 100 degrees; water evaporates off (it rises and the goes down into the condenser where it is cooled back into water), the salt is left in the original flask.

Question 3

Fractional Distillation

Answer 3

The mixture is evaporated and rises up the tube. Different substances have different boiling points and so will condense at different temperatures; as the mixture travels up the tube the temperature decreases, substances begin to condense at different places (due to the change in temperature) and are collected. This separates the mixture into its different parts.

Question 4

Crystallisation

Answer 4

A solution is warmed allowing the solvent to evaporate, the solution is now left to cool and will form crystals.

Question 5

Paper chromatography

Answer 5

Chromatography paper is placed in a substance, the different components of the substance will travel at different speeds (due to the size of their particles)

Question 6

How can information from chromatograms be used to identify the composition of a mixture

Answer 6

The shape on the chromatogram can be compared with that of known substances and where they match they are identified as the same substance.