6.3

Question 1

Mobile phase

Answer 1

Moves in a definite direction

Gas or liquid

Question 2

Stationary phase

Answer 2

Fixed in place

Question 3

Why does separation occur?

Answer 3

Because each chemical in the mixture has different attractions to each phase

Question 4

Thin layer chromatography stationary phase?

Answer 4

Glass covered with aluminium oxide

Question 5

Thin layer chromatography mobile phase?

Answer 5

Organic solvent

Question 6

What does gas chromatography do?

Answer 6

Separates volatile components in a mixture

Question 7

Gas chromatography stationary phase?

Answer 7

Solid/liquid coating of a coiled tube, usually a hydrocarbon with a high boiling point

Question 8

Gas chromatography mobile phase?

Answer 8

Unreactive carrier gas like helium or nitrogen

Question 9

How does a gas chromatogram graph work?

Answer 9

Is plotted absorbtion against time
Shows retention time
The area under the peak shows the concentration of the compound in the original mixture
Can compare retention times to known compounds

Question 10

What can you use to test for pH?

Answer 10

Indicator or a pH probe

Question 11

How do you test for a haloalkane?

Answer 11

AgNO3 and ethanol, precipitates

Question 12

What is used in NMR as the reference chemical and why?

Answer 12

TMS (tetramethylsilane)
Because in only has one environment for both H and C
Non toxic
Inert
Volatile

Question 13

What is used to dissolve the molecules in NMR?

Answer 13

CDCl3 solvent

Deuterium is used because it doesn’t show up

Question 14

What is the rule used in H NMR?

Answer 14

N+1

Question 15

When is D2O used in NMR?

Answer 15

To make the OH/NH groups disappear/not show up so that they can be found on the spectrum