Separation and purification - Edexcel

1

Which of these images shows a pure compound?

2

Which is the correct description of these particles?

Red and black circles are joined by much smaller white circles.

3

How does filtration work?

4

Which is the best way to obtain a sample of salt from a salt solution?

5

Which is the correct order for obtaining salt from a mixture of sand and salt?

6

What property difference allows mixtures of liquids to be separated by fractional distillation?

7

Which method is usually used to separate and identify coloured dyes from each other?

8

Crude oil can be separated into several liquids that have different boiling points. What is the name of this process?

9

What is chlorine used for in water treatment?

10

Where are the spots of the samples placed in chromatography?