Alchols part 2 Flashcards
What test do we use for ALdehydes and ketones -
tollens reagent and fehling’s solution
What is the test for Carboxylic acid -
Add sodium carbonate , fizzing shows positive results
What is the difference between aldehydes and ketones -
Aldehydes can be further oxidised and ketones cant
Disadvantages of using alcohols as fuels-
less energy used compared to traditional alkanes, fermentation probably won’t meet demand.
Not carbon neutral as CO2 released during manufacturing and transport
How could you tell the difference between a tertiary and secondary alcohol
oxide them secondary will have a colour change the other wont.
What is the definition of a primary alcohol -
functional group carbon 2 to hydrogens attached to it.
Name the two oxidizing agents and their colour change
Acidified potassium magnate (Vll) - from purple to colourless
Acidified Potassium dichromate - Orange to green - we often use this one as it’s not as vigorous an oxidizing agent.(traffic light)
K2Cr2O7
Describe the fehling’s test for ketones and aldehydes and what happens in this reaction
Positive result=red precipitate of Cu20 means alderyde
Negative result = no precipitate = ketone
What happens to the oxidising of a tertiary alcohol - d
doesn’t happen
Benefits of using alcohols as fuels
Biofuels, is a renewable source
Removal of CO2 by photosynthesis
6 CO2 + 6 H2O = C6H12O6 + 6 O2
carbon dioxide +water =goes to glucose +oxygen
Production of CO2 by fermentation
C6H12O6 = 2 CH3CH2OH + 2 CO2
glucose = ethanol +carbon dioxide
what is the formula for glucose
C6H12O6
what is the formula for ethanol
CH3CH2OH
what happens when you dehyrate an alchole
you can an alkene
