Chemical analysis

1

Which of the following is not true of a pure substance?

2

Which method could be used to separate a mixture of ethanol and water?

3

What is the definition of ‘solution’?

4

Distillation involves which physical processes?

5

In chromatography, what can be used to identify an unknown substance?

6

What chemical compound is used to test for the presence of water?

7

What colour flame would a compound containing calcium ions give in a flame test?