Paper 3-2023 Flashcards
(22 cards)
What is caused if water flowing in wrong direction in reflux
Ester doesn’t fill condenser properly
Why CO32- added to distillate
To neutralise acid
Why two layers formed in separating layer
Ethyl ethanoate immiscible/ insoluble
Why ethyl ethanoate forms upper layer
Ethyl ethanoate is less dense that water
Why percentage yield not 100%?
Reaction in equilibrium/incomplete reaction
Reagent and conditions needed for hydrolysis
Aq HCl
Warm/reflux
Why lid needed for TLC
Prevent evaporation of solvent and from plate
Why amino acids separate on TLC plate
Difference in balances between solubilities in solvent and retention on stationary
Why developing agent needed
Amino acid is colourless/needed to be made visible
Why CO32- effervescence formed with Fe3+ and not Fe2+
co32 gas formed. Fe3+ more acidic than Fe2+ due to Fe3+ being smaller with greater charge density
Why all three molecules polar and why ethyl amine is least polar?
O+N more electronegative than C or H. All have polar bonds. CH3CH2NH3= pyramidal. Other 2 are bent shapes/ not symmetrical. O more electronegative than N.
Relative MR of benzene 1,4-dicarboxylic acid
166 mr
Substance with significant delocalisation
Graphic
Std enthalpy change equal to std enthalpy formation for BaCl2?
Ba(s) +Cl2(g)—> BaCl2(s)
Total area under curve for maxwell distribution
Tot. no of particles present
Why rate is greater with catalyst
Proportion of successful collisions increased as catalysed reaction has Lowe activation energy
What happens when water is vapour used
IMF overcame
What species can behave as bronsted Lowry acid
SO42-
HCO3-
BF3
NH3
HCO3-
Ba added to water. Observation
Colourless solution with effervescence
Strongest reducing agent
I-
Compound that can decolourises KMnO4-
FeSO4
When cisplatin bonds to DNA, which is correct ligand replacement reaction
Replace two Cl- ligands
