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Organic Analysis
AQA A Level Chemistry
Question | Answer |
---|---|
What is observed when sodium is added to an alcohol? | Fizzing |
What is observed when potassium dichromate is added to a primary or secondary alcohol? | Turns orange --> green |
What is the test to differentiate between an aldehyde or a ketone? | Fehling's, Benedict's or Tollen's |
What is observed when aldehydes are added to tollens reagent | Silver mirror formed |
What is observed when an aldehyded is added to fehlings reagent | red precipitate formed |
What is the test and observation for an alkene? | Bromine water, orange --> colourless |
What are the steps to test for a halogenoalkane? | Add sodium hydroxide, nitric acid, then silver nitrate |
What is the observation when using silver nitrate to test for the different halogenoalkanes? | Chlorine gives white precipitate, bromine cream, iodine yellow |
What is the test and observation for a carboxylic acid? | Add sodium hydrogen carbonate, fizzing |
How can the results from mass spectrometry be used to work out the molecular mass of a compound? | By the mass of the final peak in the spectrum |
How can high resolution mass spectrometry distinguish between molecules with the same molecular mass? | By resolving their masses to a greater/more precise number of decimal places |
What is a wavenumber? | 1/wavelength |
Which regions in an IR spectra will show peaks for a given organic compound | |
Where can the finger print region be found on an IR spec | below 1500cm-1 |
What happens to bonds when they absorb infra-red radiation | the bonds begin to vibrate/strech |
What causes global warming? | Absorption of IR waves by bonds in greenhouse gases |
What bond in methane aborbs infra-red radiation | C-H bonds |
What bond in Carbon dioxide absorbs infra-red radiation | C=O bonds |
What bond in water absorbs infra-red radiation | O-H bonds |
What are the three main greenhouse gases? | Carbon dioxide, methane, water vapour |