F324 Past Papers Flashcards
What happens wen something reacts with tollens?
It is oxidised.
When bromine reacts with phenol what would you observe to happen?
A white precipitate forms, And bromine decolourise.
What are problems with kukele?
Enthalpy change of hydrogenation is less exothermic than expected.
What is retention time?
The time from the injection of a sample for the component to leave the column.
What are problems with chiral drugs?
Production or separation of a single isomer can be difficult.
Another isomer may be harmful.
How can problems with chiral drugs be overcome?
Enzymes.
Chiral synthesis.
How can you derive the structure of a compound through the Bradys test?
Take the melting point of product and compare with known values.
When do you leave the ends?
When asked for repeats.
How does a liquid stationary phase separate compounds in a mixture?
Relative solubility
What are problems with kukele?
Enthalpy change of hydrogenation is less exothermic than expected.
What is retention time?
The time from the injection of a sample for the component to leave the column.
What are problems with chiral drugs?
Production or separation of a single isomer can be difficult.
Another isomer may be harmful.
How can problems with chiral drugs be overcome?
Enzymes.
Chiral synthesis.
How can you derive the structure of a compound through the Bradys test?
Take the melting point of product and compare with known values.
When do you leave the ends?
When asked for repeats.
How does a liquid stationary phase separate compounds in a mixture?
Relative solubility
Why does the nitration of benzene make numerous products?
Substitution of NO2 at different points of the ring.
Write the formula of the salts formed when C2H5NH2 reacts with:
Sulphuric acid
Ethanoic acid
(C2H5NH3+)2 SO42–
C2H5NH3+ CH3COO–
What is condensation polymerisation?
Monomers joining to form a chain and another small molecule like H2O.
What increases water solubility?
Forming more H bonds
What is the observation made when something is oxidised by K2Cr207?
Turns green or blue
What does the D2O shake show?
It removes an OH or NH peak
Explain the relative resistance to bromination of benzene and an alkene.
Benzene has delocalised pi bonds.
Alkene has localised pi bonds between 2 carbons.
Benzene has a lower e density.
Benzene polarises Br2 less.
