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OCR A-level Chemistry A > Analysis > Flashcards

Flashcards in Analysis Deck (12):
1

Alkene

Bromine water decolourises

2

Haloalkane

Silver nitrate + ethanol, 50'C
Cl=white ppt. Br=cream coloured ppt. I=yellow ppt.

3

Carbonyl

add 2,4-DNPH
orange precipitate forms
find m.p for exact molecule

4

Aldehyde

Tollen's reagent, warm
Silver mirror forms

5

Primary/secondary alcohol

K2CR2O7/H2SO4, warm
orange ->green

6

Carboxylic acid

add aq. sodium carbonate
effervescence

7

Phenol

Reacts with Na &NaOH
or
add X2, white ppt forms

8

Phase

state of matter

9

Adsporption

when a solid (sometimes a liquid) holds a substance onto its surface- paper&TLC

10

Absorption

soaking into the material, not at the surface eg. sponge in water- gas

11

Rf value

distance moved by component/distance moved by solvent

12

Reference signal in NMR provided by

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