Organic analysis

Question 1

define molecular ion

Answer 1

molecule with one electron knocked off

Question 2

what can high resolution mass spectrometry be used for

Answer 2

determine molecular mass of compound from accurate mass of molecular ion

Question 3

high resolution mass spectrometry measures mass to

Answer 3

5.d.p so is more accurate

Question 4

what is the fingerprint region

Answer 4

between 1000-1500

Question 5

a fingerprint region

Answer 5

is unique to each compound

Question 6

rogue absorptions are indicate

Answer 6

impurities

Question 7

what is the mechanism of the greenhouse effect

Answer 7

UV wavelength radiation passes through atmosphere to Earth’s surface
heats up Earth’s surface
Earth radiates infrared long wavelength radiation
C=O bonds in C02 absorb ir radiation
IR radiation doesn’t escape from atmosphere

Question 8

how does the greenhouse effect warm the planet

Answer 8

energy from absorbed IR radiation is passed onto other molecules in atmosphere
by collision

Question 9

how to identify alkenes + result

Answer 9

bromine water

orange to colourless

Question 10

how to identify aldehydes + result

Answer 10

Fehling’s solution

blue solution to red ppt

Question 11

how to identify aldehyde + result T

Answer 11

Tollen’s reagent

silver mirror formed

Question 12

how to identify carboxylic acid + result

Answer 12

sodium carbonate

effervescence of CO2 evolved

Question 13

how to identify 1o 2o alcohol and aldehyde + result

Answer 13

sodium dichromate + sulfuric acid

orange to green colour change

Question 14

chloroalkane

Answer 14

warm with silver nitrate

slow formation of ppt with AgCl

Question 15

what is IR radiation absorbed by

Answer 15

covalent bonds in molecules

Question 16

bonds between different atoms =

Answer 16

absorb different frequencies of infrared radiation

Question 17

the peaks show

Answer 17

where radiation is being absorbed