Section 3

Question 1

alkene

Answer 1

Bromine water and shake

colourless

Question 2

haloalkane

Answer 2

aqueous silver nitrate and ethanol

warm in water bath

Question 3

phenol step 1

Answer 3

Add NaOH - solid dissolves and sodium salt forms

Question 4

phenol step 2

Answer 4

Add Na2CO3 - nothing happens

Question 5

COOH

Answer 5

Na2CO3

CO2 made

Question 6

TLC

Rf value

Answer 6

distance travelled by spot/distance travelled by solvent

Question 7

TLC

Why do some travel not as far

Answer 7

Attraction between plate and surface - adsorption

Strongly adsorbed travel less

Question 8

TLC

What affects adsorption

Answer 8

Polarity

Question 9

TLC

How to check it’s right

Answer 9

Run pure sample along side it

Question 10

GC

Answer 10

Inject gas into coated tube

Question 11

GC what affects retention times

Answer 11

Compound dissolves and evaporates so the more soluble, the more time it takes

Question 12

GC

finding conc

Answer 12

Create standard solution of different conc of analyte
inject in GC
Calculate area under peak
Plot area/conc

Question 13

GC Blank

Answer 13

solution containing all solvents and reagents used to make standard solution but no analyte
Find corrected peak value

Question 14

Why TMS

Answer 14

Contains carbon and hydrogen in same environment