ANALYSIS

Question 1

Outline the molecular ion formed equation

Answer 1

Molecular ion formed:

M > M+ + e-

Question 2

Define molecular ion

Answer 2

The molecule with one electron knocked off

Question 3

How can molecules with the same Mr be differentiated in a sample

Answer 3

Mass spectrometry

Precise

Acurate masses of atoms

Question 4

What is a rogue absorption

Answer 4

Indication of impurity

Wrong absorption on infrared spectroscopy

Question 5

Alkene testing

Answer 5

Bromine water

Orange to colourless

Question 6

Aldehyde testing

Answer 6

Fehlings solution/Benedicts

Blue to red precipitate

Tollens reagent

Silver mirror forms

Question 7

Carboxylic acid testing

Answer 7

Sodium carbonate

Effervescence of CO2

Question 8

Primary/Secondary alcohol/aldehyde test

Answer 8

Sodium dichromate and sulphuric acid

Orange to green

Question 9

Chloroalkane testing

Answer 9

Warm with silver nitrate

Slow formation of white AgCl precipitate

Question 10

Outline the use of tollens reagent and how it’s made

Answer 10

Mixing aqueous ammonia and silver nitrate

Heat gently

Aldehydes are oxidised to form silver mirror

Question 11

Outline the use of fehlings solution

Answer 11

Heat gently

Aldehydes are oxidise to form a red precipitate