AQA A Level Chemistry 2025 - Paper 3
A large difference between experimental and calculated lattice enthalpy values are due to... - correct
answerrelatively large degrees of covalent bonding.
positive ions can be said to polarise negative ions, if they cause distortion of the charge cloud. They can
pull electrons to one side of the ion.
As temperature rises what happens to the rate constant? - correct answerAs temperature rises, the rate
constant gets larger, so the rate is faster
As the activation energy rises what happens to the rate constant? - correct answerAs the activation
energy rises, the rate constant gets smaller (so the rate is slower).
assumptions of the ionic model - correct answer-completely ionically bonded
-perfectly spherical
-of even charge distribution
Autocatalysis - correct answera reaction in which a product is the catalyst.
bidentate - correct answerWhen a ligand can form two co-ordinate bonds in a complex ion.
Chelate effect - correct answerthe ability of multidentate ligands to form more stable metal complexes
than those formed by similar monodentate ligands
Classic elements which are not transition metals despite being D-Block elements - correct
answerScandium and Zinc
co-ordination number - correct answerThe number of co-ordinate bonds formed to a central metal ion
complex ion - correct answerA transition metal ion bonded to one or more ligands by coordinate bonds
, Conditions for entropy - correct answer1atm pressure
298K
Cu 2+ (aq) - correct answerblue solution
cu 2+ with carbonate - correct answergreen-blue carbonate
Cu 2+ with NaOH - correct answerBlue precipitate
Cu2+ with ammonia - correct answerdeeper blue
Denticity - correct answerthe number of dative bonds that can be formed with a transition metal by one
ligand
electrophile - correct answerelectron pair acceptor
endothermic reaction graph (entropy) - correct answernegative gradient (delta G vs T)
enthalpy of solution formula - correct answerlattice enthalpy dissociation + enthalpy of hydration
exothermic reaction graph (entropy) - correct answerpositive gradient (delta G vs T)
Factors affecting entropy - correct answerTemperature
Physical state
number of moles
factors affecting shape of ligand - correct answer-central metal ion present
-ligands
A large difference between experimental and calculated lattice enthalpy values are due to... - correct
answerrelatively large degrees of covalent bonding.
positive ions can be said to polarise negative ions, if they cause distortion of the charge cloud. They can
pull electrons to one side of the ion.
As temperature rises what happens to the rate constant? - correct answerAs temperature rises, the rate
constant gets larger, so the rate is faster
As the activation energy rises what happens to the rate constant? - correct answerAs the activation
energy rises, the rate constant gets smaller (so the rate is slower).
assumptions of the ionic model - correct answer-completely ionically bonded
-perfectly spherical
-of even charge distribution
Autocatalysis - correct answera reaction in which a product is the catalyst.
bidentate - correct answerWhen a ligand can form two co-ordinate bonds in a complex ion.
Chelate effect - correct answerthe ability of multidentate ligands to form more stable metal complexes
than those formed by similar monodentate ligands
Classic elements which are not transition metals despite being D-Block elements - correct
answerScandium and Zinc
co-ordination number - correct answerThe number of co-ordinate bonds formed to a central metal ion
complex ion - correct answerA transition metal ion bonded to one or more ligands by coordinate bonds
, Conditions for entropy - correct answer1atm pressure
298K
Cu 2+ (aq) - correct answerblue solution
cu 2+ with carbonate - correct answergreen-blue carbonate
Cu 2+ with NaOH - correct answerBlue precipitate
Cu2+ with ammonia - correct answerdeeper blue
Denticity - correct answerthe number of dative bonds that can be formed with a transition metal by one
ligand
electrophile - correct answerelectron pair acceptor
endothermic reaction graph (entropy) - correct answernegative gradient (delta G vs T)
enthalpy of solution formula - correct answerlattice enthalpy dissociation + enthalpy of hydration
exothermic reaction graph (entropy) - correct answerpositive gradient (delta G vs T)
Factors affecting entropy - correct answerTemperature
Physical state
number of moles
factors affecting shape of ligand - correct answer-central metal ion present
-ligands
