Organic Analysis (Chapter 16)

Question 1

What is the observation with bromine water and an alkene?

Answer 1

Orange to colourless

Question 2

What is the observation with the G7 ions and nitric acid + silver nitrate and then ammonia?

Answer 2

Chloride = white and soluble in dilute ammonia

Bromide = cream and sparingly soluble in dilute ammonia but soluble in concentrated

Iodide = yellow and insoluble in concentrated ammonia

Question 3

What is the observation with G2 metals and NaOH and then H2SO4?

Answer 3

Magnesium = insoluble white precipitate then soluble in H2SO4

Calcium = slightly soluble white precipitate then slightly soluble in H2SO4

Strontium = soluble precipitate then insoluble white precipitate in H2SO4

Barium = soluble precipitate then insoluble white precipitate in H2SO4

Question 4

What is the observation with Acidified Potassium dichromate VI with alcohols?

Answer 4

Primary = orange to green

Secondary = orange to green

tertiary = stays orange

Question 5

What are the observations of fehlings with aldehyde or ketone?

Answer 5

Aldehyde = blue to brick red

Ketone = stays blue

Question 6

What are the observations of tollens with aldehyde or ketone?

Answer 6

Aldehyde = silver mirror

Ketone = no change

Question 7

What is the observation when sodium carbonate reacts with a carboxylic acid?

Answer 7

Gas/bubbles produced

Question 8

Describe the process of mass spectrometry

Answer 8

1) Ionised
2) Accelerated to constant KE
3) Allowed to drift
4) Detected

Question 9

Which peak shows Mr for mass spectrum sample?

Answer 9

Furthest to the right

Question 10

What does mass spectroscopy do?

Answer 10

Allows molecular formula to be found

Question 11

How many decimal places are m/z value?

Answer 11

4

Question 12

How is IR used to determine functional groups?

Answer 12

Absorb different amount of radiation causing molecule to vibrate more rapidly