Mixtures And Chromotography

Question 1

Is there a chemical bond between mixtures ?

Answer 1

Unlike a compound there is no chemical bond between the different parts of a mixture

They can be easily separated by filtration, crystallisation, fractional distillation, simple distillation and chromotography

Question 2

What is air a mixture of ?

Answer 2

Air is a mixture of gases, mainly nitrogen, oxygen, carbon dioxide and argon

The gases can be separated fairly easily

Question 3

What does filtration do ?

Answer 3

Filtration separates insoluble (things that don’t dissolve in water) solids from liquids

Question 4

What are two ways to separate soluble solids from solutions ?

Answer 4

Evaporation and crystallisation are two ways you can separate soluble solids from solutions

Question 5

Instructions for evaporation

Answer 5

Pour the solution into an evaporating dish

Slowly heat the solution. The solvent will evaporate and the solution will get more concentrated. Eventually, crystals will start to form

Keep heating the evaporation dish until all you have left are dry crystals

Question 6

Instructions for crystallisation

Answer 6

Pour the solution into an evaporating dish and gently heat the solution. Some of the solvent will evaporate and the solution I’ll get more concentrated

Once some of the solvent has evaporated or hen you see crystals about to form remove the dish from the heat and leave the solution to cool

Filter the crystals and leave them in a warm place to dry

Question 7

What is distillation used for ?

Answer 7

Distillation is used to separate mixtures which contain liquids

There are two types of distillation: simple and fractional

Question 8

What is simple distillation used for ?

Answer 8

Simple distillation is used for separating out a liquid from a solution

Question 9

What is fractional distillation used for ?

Answer 9

Fractional distillation is used to separate a mixture of liquids