Purity Flashcards
(8 cards)
1
Q
What is a pure substance?
A
A pure substance has no other substances mixed with it
2
Q
Any unwanted substances is what?
A
An impurity
3
Q
How can you check to see if there’s an impurity?
A
Check the m.p or the b.p
4
Q
What do pure substances have?
A
A sharp definite m.p and b.p values
5
Q
WHAT HAPPENS WHEN A SUBSTANCE HAS IMPURITIES?
A
M.P DECREASES AND B.P INCREASES
6
Q
What happens the more impure the substance is?
A
The bigger the change and the wider the T range there is
7
Q
Why is it important to remove impurities?
A
As they would have side effects in our body
8
Q
Name the ways for removing impurities
A
- Filtering
- Evaporation
- Centrifugation + decanting
- Simple distillation
- Fractional distillation
- Using a separating funnel
- Chromatography
- Crystallisation
