Mixtures and Separating

Question 1

A substance can only be separated from water by filtration if it is…..

Answer 1

insoluble

Question 2

What is meant by the term “mixture” in a
chemical sense?

Answer 2

It can be easily separated and the substances in the mixture are not
chemically bonded.

Question 3

A substance which has dissolved in water can be separated
from the water by………

Answer 3

evaporation

Question 4

If a mixture of water and ethanol is heated to 79 o C what will happen to the ethanol

Answer 4

The ethanol will have boiled and will evaporate.

Question 5

What is the function of the
condenser?

Answer 5

To condense the vapours back into a liquid

Question 6

Distillation is a method of separating 2 or more _______ with
different _______ points

Answer 6

liquids
boiling

Question 7

briefly describe how the liebig condenser works.

Answer 7

The water and ethanol are heated. The ethanol vapours (which
evaporate first) rise up the distillation flask. As they pass through
the condenser, the vapours are cooled down, turning back into a
liquid which can be collected.

Question 8

Chromatography
-Why are the different colours in ink able to be separated in this way?

Answer 8

Different pigments have different masses. The heavier the pigment,
the less far the colour can travel with the water (solvent). The
lighter the pigment, the further it will travel.