1.4 Fractional Distillation And Paper Chromatography

Question 1

Chromatography def

Answer 1

The process whereby small amounts of dissolved substances are separated by running a solvent along a material such as absorbent paper

Question 2

Def biofuel

Answer 2

Fuel made from animal or plant products

Question 3

Miscible def

Answer 3

Liquids that dissolve into each other

Question 4

What is a fractionating column?

Answer 4

A tall glass column filled with glass beads

Question 5

Does the temperature get higher or lower as it goes up the fractionating column?

Answer 5

It goes down

Question 6

What must the vapours do before reaching the condenser?

Answer 6

The vapours must pass over and between the glass beads in the fractionating column

Question 7

Why does chromatography work?

Answer 7

It works because some compounds in a mixture will dissolve better than others in the solvent chosen (usually water)

Question 8

How does chromatography work?

Answer 8

• A capillary tube is used to dab a spot of the solution on a pencil line near the bottom of the sheet of absorbent chromatography paper
• The paper is then placed standing in a solvent at the bottom of a beaker
• The solvent is allowed to soak up the paper, running through the spot of the mixture

Question 9

What determines how far the mixtures travel up the paper?

Answer 9

The relative solubility of the components making up the mixture