Analysis Flashcards
1
Q
Alkene
A
Bromine water decolourises
2
Q
Haloalkane
A
Silver nitrate + ethanol, 50’C
Cl=white ppt. Br=cream coloured ppt. I=yellow ppt.
3
Q
Carbonyl
A
add 2,4-DNPH
orange precipitate forms
find m.p for exact molecule
4
Q
Aldehyde
A
Tollen’s reagent, warm
Silver mirror forms
5
Q
Primary/secondary alcohol
A
K2CR2O7/H2SO4, warm
orange ->green
6
Q
Carboxylic acid
A
add aq. sodium carbonate
effervescence
7
Q
Phenol
A
Reacts with Na &NaOH
or
add X2, white ppt forms
8
Q
Phase
A
state of matter
9
Q
Adsporption
A
when a solid (sometimes a liquid) holds a substance onto its surface- paper&TLC
10
Q
Absorption
A
soaking into the material, not at the surface eg. sponge in water- gas
11
Q
Rf value
A
distance moved by component/distance moved by solvent
12
Q
Reference signal in NMR provided by
A
Tetramethylsilane (TMS), (CH3)4Si
- non-toxic, inert liquid
- low bp, can be distilled off and reused
- 12 H atoms so a lot of energy required
- all C&H atoms in same environment so only 1 peak
