Notes on PPQs/in general Flashcards
(18 cards)
what effect do impurities have on the mp & bp of a substance?
decrease mp as they disrupt the crystal/lattice structure?
increase bp
why is the solution containing [Al(H2O)6]3+ acidic?
Al3+ is highly charged & small size
Al3+ attracts the e-s from the O-H bond
O-H bond is polarised
O-H weakens
H+ released
LOOK AT WHERE GRAPH AXES START
MIGHT NOT BE 0
HCl reacts with NaOH in another reaction
reacting ratio is 1:1 NOT using the molar ratio in the previous step
what are the bond angles in cyclohexane?
all 109.5
what is the order of polarity of C=O, O-H & -O- bonds?
most polar –> least polar
O-H
C=O
-O-
what is the name of product of electrophilic addition with sulfuric acid?
___-yl hydrogen sulfate
e.g. ethyl hydrogen sulfate
Eθ __>__ used a lot - must use to explain why specific reaction cannot happen
does not include the H+ & H2Os in the equation
0 current is also a standard condition
‘use data’ means calculate the emf
___ given ion cannot be used in salt bridge because….
it reacts with __ - name specific species
when explaining major advantage of fuel cell…
don’t just say ‘highly efficient’, be specific to the energy stores in the Q
e.g. ‘converts more of the available energy from the combustion of H into the KE of the car’
when explaining why electrode is the positive electrode,
NAME the substance that is reduced
e.g. reduction happens at the +ve electrode AND O2 is reduced
EDTA complexes exhibit optical isomerism
why does a large excess of the other reactants in a reaction mean the rate of reaction is ONLY dependent on the concentration of 1 reactant?
[A] & [B] stay constant
neither A nor B have an effect on the rate of reaction as effectively 0 order
explain how the graph shows the order with respect to __ is 0
gradient is constant
so as [__] changes, the rate stays the same
order is 1 or 2
gradient decreases
so as [__] decreases, the rate decreases
why does ___ contribute to global warming?
it absorbs IR radiation
becuase it has polar bonds
