Chapter 1.3 Separating Mixtures

Question 1

Compound VS Mixture

Answer 1

Compound: have a fixed composition
Must use chemical reactions to separate
There ARE chemical bonds between atoms
Mixture: no fixed composition
Can use physical means
NO chemical bonds

Question 2

Physical means (4)

Answer 2

Filtration
Crystallisation
Distillation
Chromatography

Question 3

Filtration

Answer 3

Separates soluble substances from insoluble
Using filter paper and funnel
(Dry the residue eg sand using a paper towel or oven )

Question 4

Crystallisation

Answer 4

Use a Bunsen burner and heat the salt solution using an evaporating dish above a water bath.
When crystal form the solution is saturated
Let it dry naturally
Pat crystals dry

Question 5

Distillation (eg to get drinking water from sea water)

Answer 5

A solution is heated and boiled to evaporate the solvent
The vapour enters the condensing tube
The water jacket around the tube acts as a coolant
The vapour is condensed
And collected

Question 6

Mixture (define)

Answer 6

A mixture is made up of 2 or more substances that are NOT chemically bonded together.