4.2.3 - Organic synthesis practical & Analytic techniques Flashcards
1
Q
Name the greenhouse gases .
A
- Carbon dioxide
- Methane
- Water vapour
2
Q
How do green house gases contribute to global warming ?
A
3
Q
Uses of IR
A
- to monitor gases
causing air pollution (e.g. CO and NO from car emissions - in modern breathalysers to
measure ethanol in the breath
4
Q
Why do we use mass spec
A
To identify the the molecular ion peak and hence to determine molar mass
5
Q
what is m/z
A
Mass of fragment / (divided by) its charge.
- Learners should be aware that mass spectra may
contain a small M+1 peak from the small proportion
of carbon-13.
6
Q
How do you identify and unknown compound using IR and Mass spec
A
Step 1 is through like empirical formula and mr = mass/moles etc
7
Q
Why do we use reflux
A
To heat volatile liquids
8
Q
Why do we use distillation
A
To separate substances with different boiling points
9
Q
Why do we use redistillation
A
To purify a voliate substance which can be purified using futher seperations
10
Q
Name the ) preparation and purification of an organic
liquid including:
A
- use of a separating funnel to remove an
organic layer from an aqueous layer - drying with an anhydrous salt (e.g.
MgSO4, CaCl 2) to remove water - redistillation
11
Q
What do we call the regions below 1500 on the ir spec
A
Finger print regions
