CC2B Filtration and Crystallisation

Question 1

What is a mixture

Answer 1

Consists of 2 or more elements or compounds not chemicaaly combined together

Question 2

What is a pure substance

Answer 2

A single element or compound, not mixed with any other substance

Question 3

What is a pure substane in everyday use

Answer 3

A substance that has nothing added to it so it is unadulterated and in its natural state e.g pure milk

Question 4

What sort of mixtures can filtration be used to seperate

Answer 4

Filtration is used to separate an insoluble substance from a solution

Question 5

Describe how to separate an insoluble substance from a solution

Answer 5

Place filter paper in a funnel
Pour the solution containing an insoluble substance through the funnel into a conical flask
The insoluble substance will collect on the filter paper and the solution will collect in the conical flask

Question 6

When is the process of crystallisation used to separate a mixture

Answer 6

To separate a soluble solid from a solution if the solid decomposes when heated

Question 7

What are the steps of crystallisation

Answer 7

Pour the solution into an evaporating dish and heat gently
When the crystals start to form remove the dish from the heat and leave to cool
Once cold filter the crystals out of the solution and leave them in a warm place to dry