Purity

Question 1

What is a pure substance?

Answer 1

A pure substance has no other substances mixed with it

Question 2

Any unwanted substances is what?

Answer 2

An impurity

Question 3

How can you check to see if there’s an impurity?

Answer 3

Check the m.p or the b.p

Question 4

What do pure substances have?

Answer 4

A sharp definite m.p and b.p values

Question 5

WHAT HAPPENS WHEN A SUBSTANCE HAS IMPURITIES?

Answer 5

M.P DECREASES AND B.P INCREASES

Question 6

What happens the more impure the substance is?

Answer 6

The bigger the change and the wider the T range there is

Question 7

Why is it important to remove impurities?

Answer 7

As they would have side effects in our body

Question 8

Name the ways for removing impurities

Answer 8

1. Filtering
2. Evaporation
3. Centrifugation + decanting
4. Simple distillation
5. Fractional distillation
6. Using a separating funnel
7. Chromatography
8. Crystallisation