🔹topic 3 - States Of Matter, Sperating And Purifying

Question 1

Explain why if you filtered copper sulphate solution you would not get copper sulphate

Answer 1

As the copper sulphate is dissolved and would go through the filter paper

Question 2

Describe the risks and safety measures needed in doing crystallisation.

Answer 2

• Risk, Bunsen burner Safety measure, tie hair back

- Risk, solution it boils over Safety meausre, heat slowly with a flame

Question 3

What’s a physical property?

Answer 3

A property that can be measured

Question 4

What’s the disadvantages and advantages of evaporating a solution to dryness

Answer 4

Adv, it increases the yeild

Dis adv. it leave some impurities

Question 5

What are the advantages and disadvantages of saturating a solution and allowing it to cool?

Answer 5

Advantage, you get bigger crystals that are more pure

Disadvantage, the yeild isn’t as big

Question 6

In paper chromatography, what’s the stationary and and the mobile phase?

Answer 6

Stationary phase = paper

Mobile phase = solvent

Question 7

A person conducting a paper chromatography experiment has shaky hands. What kind of error could this introduce?

Answer 7

A random error as the dot may not have been drawn exactly on the start line

Question 8

State 3 risks involved in distillation and the safety measures you would use to reduce them

Answer 8

Steam could scale you so you should use an efficient condenser
Water in the flask could jump so use anti bumping granules
Using the Bunsen for heating so tie hair back

Question 9

Why do you have a condenser with water going it at the bottom and top in distillation?

Answer 9

So that water flows against gravity and fills the condenser

Question 10

Why doesn’t distilled water need to be sterilised?

Answer 10

As it’s pure and so contains no microbes that need to be killed